Chevrolet engine block casting numbers

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 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. The first is a set of Casting Numbers, the second is a set of Stamped Numbers.

Chevrolet engine block casting 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. Want to know exactly what you have? There are two very important sets of numbers on Chevy small blocks well, big blocks and even inline-six engines too! These two numbers are the casting number and engine ID code. As the name infers, the casting number is cast into the block when the block itself is cast.

Ask in our Car Mechanic Forums! Take the above CLJ example.

We are always looking for new castings numbers. If you have some information you want to share with us and our visitors, stop by the Forum and leave us a post! Right now we are limiting the listings to Chevy V-8 blocks, cranks and heads. As new castings are released on late models keep your eyes open for the new numbers. We appreciate the support and encouragement we have received from our visitors around the world for the past 20 years. Don't forget to follow us on Facebook, and if you run a website or write for a blog, please link to our site! NOTES

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. The first is a set of Casting Numbers, the second is a set of Stamped Numbers.

Chevrolet engine block casting numbers

We are always looking for new castings numbers. If you have some information you want to share with us and our visitors, stop by the Forum and leave us a post! Right now we are limiting the listings to Chevy V-8 blocks, cranks and heads. As new castings are released on late models keep your eyes open for the new numbers. We appreciate the support and encouragement we have received from our visitors around the world for the past 20 years.

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Learn More. The final digit could be a year code. Ask one of our knowledgeable Reps! Big Block Chevy : Machined pad in front of the passenger side cylinder head or above timing chain cover. January 31, And you can check dates. Roller cam, one-piece rear seal Bowtie, siamesed, straight nodular iron main caps, 2-piece seal, 4. Chevrolet issued technical service bulletins to indicate which engines were to recieve a vin stamp, so who knows what could have happend or not happened. I'm Done. Below we'll break down the ID codes prefix and suffix sections. The numbers that follow are the actual assembly date. Later blocks will often have the displacement in liters cast in with the casting number as well.

Knowing how to do a GM engine serial number lookup can be beneficial for you.

Products to Compare max of 3 X. Learn about performing an LS Swap in a Chevelle in this tech article. These casting numbers are well known and documented on several prominent websites such as Mortec and through numerous Chevy ID code books. Bowtie, siamesed, straight nodular iron main caps, 2-piece seal, 4. II, LT1, aluminum If it doesn't match - is it correct? This ledge is below the deck of the block and the ledge forms the mating surface between the block and the transmission bellhousing. Some casting dates do have the year and the decade indicated, making it easier. Tim provides more details about them and gives you a great look at them. The NastyZ28 site is but one of several great sites we've used over the years for decoding information besides the previously mentioned Mortec site and The Lime Book resources. Some of the later model blocks have the casting number on the passenger side of this ledge. If that happens to be the vehicle this engine is currently sitting in they "match". These two numbers are the casting number and engine ID code. III, 71cc, iron