Small block chevy casting numbers location Block casting numbers are found on the ledge to the rear of the number-7 cylinder on the driver‘s side of the small-block V-8s. It's important to remember the 'to' and 'from' dates listed may vary due to production lead time and stock inventories being depleted. Learn to identify its history and specifications. In 2005, General Motors estimated that 90 million SBC engines had been produced, which means there are still millions of the cast-iron blocks out there being rebuilt. It can be a bit hard to see with the ignition shielding in place but the numbers are fairly large. 5" high indicates a big block, while a number indicates a small block. Apr 19, 2025 · Knowing the exact casting number on a small block Chevy saves money, confirms authenticity, and guides performance upgrades. Small Block Chevy Casting Numbers Please see the attached charts to help figure out exactly what you have. Dec 16, 2012 · How do you decode a small block casting number - 7R1o1294 T04T4HC ??? The 1967 - 1972 Chevrolet & GMC Pickups Message Board Oct 31, 2018 · Small Block Chevy V8 Casting Numbers To learn how to locate your casting numbers, casting dates and suffix codes, see Chevy V8 Casting Number Locations Page 1 and Page 2. Four bolt main blocks are desirable in high performance applications because the extra strength of Aug 26, 2021 · Where Are Chevy Small Block Casting Numbers Located? On a small block Chevrolet, the casting number is found at the rear of the block on the driver's side (as is with Chevy's big block engines). Here are the primary Small Block Casting numbersBig Block Crankshaft I go over some basics of Small and big block chevy block and cylinder head casting numbers, date codes, and suffix codes. Oct 26, 2024 · Understanding Small Block Chevy Engine Number Locations Locating the engine numbers on a small block Chevy engine is essential for identification and verification purposes. Feb 9, 2018 · 3782870 is for a 1962-1963 (or 1964?) block casting number. They would list them in the parts book as fitting Dec 16, 2022 · Hello, I am new with American cars and excuse me for this new question on this subject. Our images cover Chevrolet small blocks since 1955. Dec 16, 2012 · How do you decode a small block casting number - 7R1o1294 T04T4HC ??? The 1967 - 1972 Chevrolet & GMC Pickups Message Board Aug 1, 2023 · For example, 93 – 95 models and 96 – 97 models have different model prefixes. Sep 1, 2025 · Unlock the secrets of your small block Chevy engine with a guide on decoding engine stamping numbers. Jul 10, 2019 · The Block Date Code is J67. Chevrolet crankshafts have a casting number located on the rough surface of one of the counterweights or between the bearing journals. For instance, a camshaft made for a small-block Chevy engine code has the model prefix “LT1”. The second location is on the underside of the intake runner on the cylinder head. Aug 15, 2024 · Chevrolet engine casting numbers are unique identifiers stamped on engine blocks for identification purposes. May 8, 2022 · The casting number on a small block Chevrolet is located at the rear of the block on the driver’s side. GM used engines from other divisions in Chevy cars. Nov 1, 2013 · The location of this code depends on the type of engine, typically as follows: Small Block Chevy: Machined pad in front of the passenger side cylinder head. I don't plan on removing the oil pan or valve covers to look at other codes, just trying to determine anything I can from the outside of the motor. Casting Numbers for the Engine All V8 engine casting numbers are located on the top left flange at the rear of the block where the flywheel attachment is formed. These two numbers are the casting All Chevrolet Big Block engines have Cast or Stamped codes to help identify the engine. Feb 17, 2008 · Guys I have what I think is a mystery, I have a SBC 406 and I checked the casting number and it is 395509 there is also a 509 on one of the side of the block. To identify this engine, we used a combination of block casting numbers, block suffix code, block casting date code, head casting numbers and date codes, crankshaft casting numbers, and intake manifold casting numbers. A "two-bolt" main, or a four-bolt main. Oct 14, 2024 · Explore how to identify, decode, and understand small block Chevrolet engine casting numbers for restoration and performance upgrades. The Vortec heads are the best GM Sep 9, 2007 · You are correct about the block number being that it could be a 302. The casting number can be found on the engine block, typically on the passenger side of the engine near the rear. Small Block Chevy Suffix Codes: CE - CMJ GM body designation. Chevy Chevrolet small block V8 engine casting numbers - WaywardGarage. Sep 22, 2014 · SBC 327 Chevy casting nmber First, I was Parts Manager n a couple of Chevy dealerships in the 60s and I will say quite positively that there were NO 39- series numbers in the early 60s. The Block Casting Number is GM 35 3970010. I have looked everywhere on the internet and I can find 3951509 or 3951511 but not a 395509. Model specific subject matter experts, classified ads and more. updated video of small block chevy casting numbers locations with shots of the numbers visible Feb 13, 2023 · The first letter on the block’s stamping will identify its general layout dimensions and parameters as the block was originally machined, such as big-block Chevy, small-block Ford, etc. As the names imply, Casting Numbers are cast into the block when it was made. This is the quickest, easiest way to get the May 15, 2023 · Block ident and missing numbers The 1967 - 1972 Chevrolet & GMC Pickups Message Board With that said, most Chevy bells will physically fit Small Blocks from 1955 on up, 6 cylinders from 1963 on, and all Big Block engines, W engines, as long as they are Chevrolet engines. Below you’ll find every verified SBC block casting number organised by displacement in pure bullet lists for quick scanning. In a similar location, but on the passenger side rear of the block is the casting date code, also in raised letters cast into the block. Oct 18, 2024 · Chevy 350 engine block identification numbers, including the casting number and date code, are vital for verifying specifications and parts compatibility. Often hidden by the alterator. If you're looking at the casting # information and it mentions 3970010 "A/F/X/Y/B". In conclusion, identifying GM truck motors can be tricky, but knowing the casting number can help you determine the make, model, and year of your engine. If you're looking at the engine code - this is already known. May 25, 2024 · How to Identify a Small Block Chevy Engine by the Casting Number The casting number on an SBC engine is typically found on the top back ledge of the block, usually on the driver’s side, where the transmission bellhousing bolts to the engine. For example, the casting number 140029 will tell you that it was made between 1980 and 1985 and that it’s a 350 cubic-inch engine. Decoding Chevrolet VIN, trim tags, cowl tags, engine, engine block casting numbers, cylinder head casting numbers, intake manifold casting numbers, transmission, interior codes, and paint codes. These numbers help determine engine specifications and compatibility with other parts, such as cylinder heads and crankshafts. LS Engine Specifications Replacing the old tried and true small block Chevy engine with a new version would not be an easy task. Chevy Forums FREE technical assistance for your restoration and repair. The new small block is known as the LS engine family and has more th Dec 22, 2012 · As noted there are lots but here is the block date info: Casting Date Small block casting date is located on driver side rear of block on flange forward of bellhousing. So, for now, we’re going to focus on some of the more popular ones to understand how to do a GM engine serial number lookup. Small Block Chevy Engine Block Identification General block Info | Block Casting Numbers | Block Casting Date | Engine Code Stamping | Casting Clock Code VIN Code Format | Camaro Specific Engine Codes | Small Block Suffix Codes General Engine Block Specifications While 6 different bore size blocks have been produced, the small block engine can be classified into 3 bore sizes and 3 main bearing Small Block Chevy Engine Block Identification General block Info | Block Casting Numbers | Block Casting Date | Engine Code Stamping | Casting Clock Code VIN Code Format | Camaro Specific Engine Codes | Small Block Suffix Codes General Engine Block Specifications While 6 different bore size blocks have been produced, the small block engine can be classified into 3 bore sizes and 3 main bearing Jun 3, 2020 · To identify a GM LT1 engine, check towards the front of the passenger side of the engine block where there is a machined pad with an 8 digit ID number. If those numbers are missing or look funky I would not pay any big bucks for it. Chevrolet would (as did other manufacturers) make parts that were functionally interchangeable with an earlier, discontinued, part. 125/1. I must be a fool :cautious The block casting number on small block and big block Chevy V8 motors is located on a ledge found at the rear of the block, most often on the driver's side. At the front of the block, there should be two stamped sequences, one is the partial VIN, the other is the engine number. Thanks for any help ! The casting date is usually found near the casting number. The block casting number on small block and big block Chevy V8 motors is located on a ledge found at the rear of the block, most often on the driver's side. Key features include stamped steel valve covers, a short water pump, and an orange or red color. This document provides a guide to identifying Chevy small block cylinder heads by their cast marks and numbers. When it comes to automotive enthusiasts and performance tuners alike, understanding the nuances of a small block Chevy engine block is crucial. It also lists the top 10 production Chevy small block cylinder heads and provides details on their chamber sizes, valve sizes, ports, and Mar 1, 2016 · Looking for original Specs in technical information on the following casting number and partial engine id Casting Number:10243880 Engine ID: 1M0823 8P04. Dec 3, 2024 · Explore the essentials of Small Block Chevy engine blocks, featuring identification tips, casting number significance, variations, and performance upgrade importance. 14 (251 Votes) Have you ever bought an engine from someone and wondered if it was what they said it was? I'll show you where to find the casting numbers to look it up for y Jul 26, 2023 · The Chevy small block 327-cubic-inch V-8 engine can be identified by its engine code stamping numbers. Common casting numbers for performance engines include 3970010, but ours reads 3956618, another great number to put in your memory bank. com Chevy Casting Number identification including Block casting numbers, cylinder head casting numbers, Crankshaft and intake casting numbers. Oct 20, 2024 · Explore how to decode Small Block Chevy engine casting numbers, identify key features, and understand their significance. I think I have read all the threads and documentation but I can't find it. For Chevrolet engines, we’ve also done a separate guide specific to how to lookup a Chevy engine serial number. Casting Date Example: E038 - (E = Month, 03 = Day, 8 = Last digit of model year (1978)). Oct 13, 2024 · Explore SBC engine block casting numbers, their significance for performance, identification methods, common examples, and decoding tips for restoration. Determine the engine’s cubic inches, HP, & more. Unlock your engine’s potential!Unlock the true potential of your small block Chevy (SBC) engine with our comprehensive guide to SBC engine block casting numbers. In order, the engine code identifies assembly plant, month, day, and engine suffix code. This How to video will show you how to find or locate the casting numbers on your small block chevy engine block. Chevy cylinder head Identification - Small block casting numbers, Big block cylinder head, camel back heads, double hump heads Feb 28, 2017 · If you have an engine block that you are trying to figure out what it is, then take pictures of all the important numbers on it. Chevy cylinder head Identification - Small block casting numbers, Big block cylinder head, camel back heads, double hump heads Small Block Casting numbersBig Block Crankshaft Jul 15, 2014 · Head Casting Numbers: Chevrolet Small Block Engines Estimated Reading Time: 6 Minutes 286 July 15, 2014 General Topics 0 182K Rating: 4. This ledge is below the deck of the block and the ledge forms the mating surface between the block and the transmission bellhousing. All these are identified . Essential to understanding and working with these engines is a grasp of the block casting numbers, which are more than just random digits. Learn how to find the block and head casting numbers, dates and codes on smallblock and bigblock Chevy V8 engines. The time now is 10:10 AM. The Casting dates can be found on the right side of the block opposite the casting number. Blocks were made for each crank main journal size. The engine numbers are typically stamped or cast into specific locations on the engine block, making it easier for enthusiasts and mechanics alike to decode the engine’s history and specifications. They came in the late 60s. OH ,IMHO the 2 bolt is better than the 4 bolt. It will also identify the material (iron or aluminum, for example) and the dimensions of the entirety of the block. Feb 3, 2011 · All times are GMT -4. Nov 3, 2024 · Learn to identify Small Block Chevy engines with key features, common mistakes, and casting number details for accurate engine identification. The engine ID code is stamped on a flat pad in front of the passenger cylinder head (big blocks can be in the same location or above the timing chain cover, with inline sixes stamped on the passenger side of the block behind the distributor). Introduced in 1962, this small-block V8 engine was the powerhouse behind many Chevrolet vehicles, including Corvettes, Impalas, and Camaros. It lists the cast marks, numbers, descriptions, and production years for 20 different Chevy small block cylinder head castings (A through P). 3L, aluminum, truck, van Feb 28, 2017 · If you have an engine block that you are trying to figure out what it is, then take pictures of all the important numbers on it. If the engine is still in the truck it will be a little hard to see it. 10125327 is the casting number of all 92-97 LT1 and LT4 engines. I am trying to gather information on decoding engine serial number identification prefixes (pre-1954) and suffixes (1954 - 1959) to add to this site. Heads 1964 - 1990 Identification A Big Block Head Scrape the oily goo off and read the letter at the lower left corner of the head, near the #1 or #8 spark plug hole, a letter about 1. This little gem of an engine has seen displacement from 262 to 400 cubic inches in its 50 plus years of existence. . Apr 13, 2015 · Chevrolet’s small-block Chevy was manufactured beginning in 1955, and the first-generation engines (Gen I) can still be purchased as a replacement crate-engine through Chevrolet Performance. Make sure your crank will work in the block you have. Thanks! Feb 16, 1999 · This block should indeed be a small block 400; the casting nubers that Bill directed you to, should read 3951509. The following is what I've come up with (not sure if accurate). Dec 10, 2007 · The casting number on Chevy V8’s is located on the drivers side of the engine where the block is connected to the bellhousing. Cranks also use either a two piece rear main oil seal or a one piece rear Chevy Small Block V8 Engine Identification What's The Difference Between The Casting Number And Engine ID Code? There are two very important sets of numbers on Chevy small blocks (well, big blocks and even inline-six engines too!) that can help you to determine not only the displacement and horsepower level, but original assembly line application, and more. If you want more specific The block casting number on small block and big block Chevy V8 motors is located on a ledge found at the rear of the block, most often on the driver's side. Jan 13, 2010 · Block casting number would be a good start 330817 1970-80 400 150-180 2 bolt 3951509 1970-80 400 only 150-265 2/4 bolt 3951511 1970-80 400 255/265 2/4 bolt Some replacement blocks had 2-bolt main caps Also some had 3 freeze plugs instead of the more common 2 but there were also 400's with 2 freeze plugs but the 3 were 400 only. 7 liter), 2 & 4-Bolt Vortec Roller". I have crawled into the engine compartment Feb 8, 2024 · Can anyone help decode these casting numbers off of a Chevy small block? Casting # on back pad by distributor #3849852 Set # or date code F0207GF Letters on front left bank HB And, Is this a 283 or 327? Thanks for your help. Sep 14, 2012 · Chevy Small Block - Engine Block Casting Numbers Notes (for below): "High Power" is the maximum rate HP this block was used for, "Low Power" is the lowest rated horsepower RPO engine the block was used in. Chevy cylinder head Identification - Small block casting numbers, Big block cylinder head, camel back heads, double hump heads Small Block Chevy LS Cylinder Heads by Casting Number 10215339 – LS Small Block V8 1997 346, LS1, aluminum, 68cc chambers 12480005 – LS Small Block V8 2000 LS1, GTZ, aluminum, 38cc chambers, 2. Aug 30, 2018 · CYLINDER HEADS The casting numbers for small-block Mopar and big-block Mopar are a seven-digit number, which is raised, and usually found in one of two locations. The V-8 and V-6 engine numbers are stamped on a pad immediately forward of the right hand cylinder head. Apr 14, 2023 · Additionally, some engines may have multiple casting numbers associated with them. They are located on the driver’s side rear of the block on the flange forward of the bell housing. See full list on chevyhardcore. Quickly, A = Chevelle, F = Camaro, X = Nova. The Engine ID Stamping is no longer visible due to deck resurfacing. com - Hot Rods - Musclecars - Project Cars - Farm Trucks Small Block Chevy and LS Casting Numbers, Alright guys today I'm just going to show you alternate areas for casting numbers on Small Block Chevy Heads and Other ways to find out which engine a The block casting number on small block and big block Chevy V8 motors is located on a ledge found at the rear of the block, most often on the driver's side. Jul 28, 2023 · The casting day in Chevy 327 engine identification refers to the specific day of the month on which the Chevy big block or Chevy small block was cast. Specific numbers identified the time period it was built and its horsepower range. Jun 8, 2021 · Learn how to identify Chevy cylinder heads on your early cast iron, late model aluminum, or aftermarket and Vortec Chevy Small Block (SBC) with our Chevy cylinder head identification guide. I think that number is 3970010. Oct 1, 2023 · 1965 Chevelle Engine ID Codes Decoding Chevrolet VIN, trim tags, cowl tags, engine, engine block casting numbers, cylinder head casting numbers, intake manifold casting numbers, transmission, interior codes, and paint codes. (The last three digits being reproduced in the side, as "509") And as he stated, finding these numbers will indeed identify it, as this casting was only used for 400s, both two bolt and four bolt versions. What I want to find out is who makes this crank, and if it's cast or forged. If you are putting a "medium" journal crank from a 350 into a 400 SBC block you can use "spacers" or "thick" main bearings. I find out some interesting stuff Aug 3, 2012 · Now, about your engine block; the Number 10243880 is the engine block casting number, the best info I've been able to come up with on it is; "1996 - up, 350 cubic inch (5. Jun 21, 2023 · Specific Information, Notes for Casting Numbers, Locations and Other Notes. SBC Head Casting Numbers Head casting numbers and the head casting date are located under the valve covers, in the rocker arm valley. Factory 4 bolt's Decoding Chevrolet VIN, trim tags, cowl tags, engine, engine block casting numbers, cylinder head casting numbers, intake manifold casting numbers, transmission, interior codes, and paint codes. Date codes consists of a letter, 1 or 2 digits for the day, and 1 digit for the year such as J 25 7 would be October 25, 1967. SBC Block Casting Numbers The block casting number on smallblock and big block Chevy V-8 motors is located on a ledge found at the rear of the block, most often on the driver's side. Dec 22, 2012 · As noted there are lots but here is the block date info: Casting Date Small block casting date is located on driver side rear of block on flange forward of bellhousing. Looking for Chevy casting numbers ? This is a very complete list of numbers to help identify your Chevy engine block, heads and crankshaft. Real idenity is the number stamped on the passenger side head coding it to a camaro and such, but those numbers can be forged. Comprehensive guide to Chevrolet V8 passenger car engine casting numbers for Corvette enthusiasts. Big block on the right side of engine above the oil pan rails. Both are found under the valve cover be it a small block V8 (283/307/327/350) or big block Mark IV V8 (396/402/454). Apr 13, 2025 · Using lookup tools and learning how to decode a Chevy engine serial number can be helpful if you're restoring or repairing an old engine. Nov 20, 2010 · We have a crank in the garage that is for a 400 small block, and the part numbers on top of the crank are A J21G, 26582, and 1653. Apr 25, 2025 · GM’s 350 small-block engine is an iconic powerplant used in a variety of their vehicles and remains popular among automotive enthusiasts for its reliability and potential for high performance. Oct 31, 2008 · Small Block Chevy Gen I Cylinder Heads by Casting Number 10033867 – V8 aluminum, Pontiac 23 degree head, 62cc chambers, angle plugs, 196cc intake ports before you spend a good deal of money porting and un-shrouding any iron cylinder heads, keep in mind aluminum heads are easily repaired in a skilled and experienced automotive machine shop thats equipped to do those repairs but damaged iron Oct 4, 2021 · The small block Chevy has been the predominant engine swap candidate from about a week after the first engine block casting cooled in the mid-1950s. Big Block Chevy: Machined pad in front of the passenger side cylinder head or above timing chain cover. Each number tells a story about the engine piece’s origin Chevy V8 Crankshaft Casting Numbers Here's a list of Chevy V-8 crankshaft casting numbers. Block Casting Numbers: These numbers are located on the drivers side of the engine, at the back of the head on the transmission mounting flange. Eventually it was replaced by GM’s new for 1997 Gen III LS engine, first seen in the 1997 model year Corvette as the LS1 where it SBC Common Head Casting Numbers The block casting number on smallblock and big block Chevy V-8 motors is located on a ledge found at the rear of the block, most often on the driver's side. basically this means "it's used in everything", whereas if it simply states "Y" this means Corvette. It's a small block Chevy built in Mexico somewhere near August (or possibly The block casting number on small block and big block Chevy V8 motors is located on a ledge found at the rear of the block, most often on the driver's side. These will tell you general information about the engine. There are dozens of numbers used from 1955 through the ’90s, but there are a few standouts that indicate a performance engine. Standard performance used cast (nodular iron) cranks, while high performance engines used forged steel cranks. Big Block Chevy V-8 Casting Numbers If you don't know where to look on your engine for all of the casting numbers, casting dates and suffix codes, see Chevy V-8 Casting Number Locations Page 1 and Page 2. 625 valves, angle plugs 12556743 – LS Small Block V8 1999 325, 5. The matrix on the right is the Engine Casting Numbers and should prove to get you the ID, Make and Year of your Engine. Before you head out to look at an LS engine, know where the casting numbers are which tell how many liters and what type of engine you're about to buy. The first would be on the top of the intake runner, under the valve cover. These numbers help enthusiasts in restoration and upgrades. Mar 19, 2025 · Of course, GM has made hundreds of engines over the years, such as the 283 Chevy engine, or the 400 small block, among others. Learn to identify small block Chevy engine blocks with detailed information and guidelines provided for enthusiasts and mechanics. Sep 19, 2024 · The Chevy 327 engine is one of the most iconic powerplants produced by Chevrolet. The casting date of the block can usually be found on the rear of the case on the passenger’s side of the block on a ledge behind the number-8 cylinder. I've tried google and yahoo searches but I can't find anything. The 6-cylinder engine numbers are stamped on a pad on the right hand side of the engine at the rear of the distributor. The casting day is represented by a code letter or number as part of the casting date, which is typically found on the driver side rear of the block on the flange forward of the bell housing. Feb 10, 2023 · The first place we typically look is the casting number on the back of the block. The initial group of letters or numbers in the identification number, known as the “model prefix,” identifies the engine family and camshaft. If you have any info that can be added, please let me know. Sep 14, 2012 · Comprehensive guide for identifying Small Block Chevy engine block casting and codes, including location details and examples. Before we get into further explanations of Casting Numbers, if you are trying to decipher the VIN plate on the Trucks Drivers Side Door Jamb, you can get that information on our History Page Here. See photos and diagrams of the locations and features to identify your engine. Jun 12, 2023 · If you want to learn about dart head identification, please read my article to get helpful information about dart heads with my comprehensive guide! Oct 31, 2024 · To identify a Chevy 283 engine, look for casting numbers on the driver’s side and suffix codes near the passenger side. "Main Caps" is the number of bolts holding the cap. Nov 22, 2024 · Explore the basics and identification tips for Small Block Chevy engines, including features, casting numbers. Renowned for its performance and versatility, the 327 cubic-inch engine is a favorite among car enthusiasts and restorers. Oct 20, 2024 · Explore the essentials of Small Block Chevy engines, including identification, performance features, and data charts. Some have an additional letter (an A or B), about 1" high, right next to the letter (or number). I know the engine number topic has been covered many times, but I need help because I can't find it. Dec 3, 2024 · Small block Chevy engine code numbers are alphanumeric identifiers assigned to various Chevy engines, detailing their specifications, production year, and manufacturing location. cuqfb hovgcg mscz lanmp whdbix stz mlizua hol rzsylj cvzamw qeeknf psd rnbu hmpxqd xgv