Small block chevy engine code stamping numbers

The Small Block Chevrolet engine is one of, if not the most successful engines of all times. Over the course of 50 years there were many different versions made. Some had better heads, more compression, or even more cubic inches. There are two sets of numbers that will help determine this.

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 sizes. In the main bearing saddles were increased in size from 2. You will NOT find a 4 bolt block made by the factory. Otherwise 2 or 4 bolt can mean either design Engine Code Stamping Numbers All engines are stamped with an engine ID code, consisting of assembly plant code, production date and suffix code.

Small block chevy engine code stamping numbers

Log in. Sign up. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. I'm trying to decode the engine code stampings on the front lip of the cylinder heads on the passengers side of the vehicle. Sort by Oldest first Oldest first Newest first Most reactions. On the left rear top of the bellhousing flange there is a date code cast into the block All the casting number's will be raised from the surface of the head and the block area. These numbers are not stamped into the heads or block, they are cast. As it turns out, that page that David linked to is the page that I used to decode some of the information. Near the top there's a section about decodeing the numbers stamped onto the right bank of cylinder heads: Engine Code Stamping Numbers All engines are stamped with an engine ID code, consisting of assembly plant code, production date and suffix code. V8 codes are stamped on a pad just forward of the right side passenger cylinder head.

This stamping will include the prefix code assembly plant and assembly date code and the suffix code. Any ideas? Four bolt main blocks are desirable in high performance applications because the extra strength of the additional bolts keeps the bottom end rigid and less prone to failure.

You just picked up a new project, and start checking out the engine to see just what you bought. Is it the original for the vehicle? Or has the transmission been changed? Deciphering Chevy's engine casting numbers, date codes, and suffix stampings will help confirm just what you have in your new project car. These codes are great to have on hand when shopping at the local swap meet or salvage yard as well.

General Decoding Information This topic can be somewhat confusing, especially with the amount of information available and the interpretation of it. You can decode the casting number. And you can check dates. The engine code and partial vin will accurately nail down whatever the thing is rather quickly, and the other information will fall into line with that. This page has basic information on it, but it's a portion of the Small Block Chevy numbers information.

Small block chevy engine code stamping numbers

You just picked up a new project, and start checking out the engine to see just what you bought. Is it the original for the vehicle? Or has the transmission been changed? Deciphering Chevy's engine casting numbers, date codes, and suffix stampings will help confirm just what you have in your new project car. These codes are great to have on hand when shopping at the local swap meet or salvage yard as well. It's not always easy to know what you're looking at visually, as decades of small block Chevys can have parts easily swapped from one year to the next or find their way under the hoods of other models or model years even.

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Identifying Small Block Chevy Engines. It is a direct replacement for the original equipment. Suffix codes are either alphabetical or alphanumeric. The CE block stamp year is the year the block was stamped and not for what year of car the block was destined for since a generic block for fitted engine could be used as a warranty replacement for any number of years' engines, applications, and for cars produced from any assembly plant. Updated by Mark Houlahan. I had been looking for information on the letter suffix code, I have seen "A" used before, and it certainly makes sense that it would be a repeat of the series for the plant sequential numbering system as the warranty sequence encompassed blocks for all GM models produced there. Small Block Chevy Identification Guide. My point here I guess is It's conceivable that some confusion of procedure may have taken place at the service end. This list of codes is a summarization, it is not complete nor all inclusive. Chances its a are slim to none. Big block on the right side of engine above the oil pan rails. It represents any CID and is used to indicate this particular engine was replaced under Warranty. This will not be the same as the block's casting date more on casting dates below.

Small-block Chevy engines are a staple in the automotive industry, known for their durability, reliability, and versatility. Engine code stamping numbers are a series of alphanumeric characters that are stamped on the engine block of a Small Block Chevy engine.

It doesn't indicate what the original equipment was. In his brothers traded cars and his middle brother made the car. In this example, 6A decodes to Atlanta final assembly, and the last six digits of the VIN. It's important to note that the "CE" designation for replacement Chevrolet engines did not start until so any year designation in the engine number would be for and later. General Motors standardized this procedure by using what's called a "gang stamp" as shown in the photo above. It looks like the only use of the HN code on a that I could find anyway was on the 69 Impala:. Their casting info includes cylinder heads, crankshafts, and more, besides the small and big block engine block casting details we've mentioned in this guide. If a customer had problems with his original engine, while it was under warranty, it was replaced with an engine that was stamped "CE" with a 6-digit number following it which serialized that particular engine. These numbers will tell you where the engine was assembled, production date, and the suffix code. It was not always done of course and at times relocated to other areas of the block and can be very light and undetectable under paint. It is a direct replacement for the original equipment. These two numbers are the casting number and engine ID code. The engine date must precede the car build date, otherwise something is amiss. The engine assembly date must precede the car build date often by a few days , otherwise something is amiss. Ask one of our knowledgeable Reps!