block I.D.

[Richard Wheelihan]

I need help finding out if my big block is from a corvette or not.Casting # for the block is 3859912 front deck pad # is T002251HR 6L209776 any help would be appreciated. Date # are B 15 6or8? Thank You Richard Wheelihan.

[John H.]

Re: block I.D.

Richard -

There are a few too many digits in the engine plant stamp code, but the "IH" code was used in '66-'68 full-size Chevrolets, and the VIN derivative indicates that it was originally installed in a 1966 full-size Chevrolet at the Van Nuys, California assembly plant.

[John H.]

Re: block I.D.

Richard -

There are a few too many digits in the engine plant stamp code, but the "IH" code was used in '66-'68 full-size Chevrolets, and the VIN derivative indicates that it was originally installed in a 1966 full-size Chevrolet at the Van Nuys, California assembly plant.

[Joe L.]

Re: block I.D.

Richard-----

I think that you must be mis-reading the block casting number since, as far as I know, there never was a "3859912" big block casting. Casting numbers can be notoriously difficult to discern, so you're not the first one to face this problem (and you won't be the last one, either). I expect that the actual number is 3963512 which was a late 1969 and 1970 big block casting.

Your "HR" suffix code was never originally used on a Corvette, though. So, it came out of some other car. At the moment, I can't tell you exactly what car or application, but I will be able to later. However, I can tell you that it was built at the Van Nuys or Southgate California GM assembly plant by the "L" in the VIN derivative. So, it was likely a full size Chevrolet passenger car.

[Joe L.]

Re: block I.D.

Richard-----

I think that you must be mis-reading the block casting number since, as far as I know, there never was a "3859912" big block casting. Casting numbers can be notoriously difficult to discern, so you're not the first one to face this problem (and you won't be the last one, either). I expect that the actual number is 3963512 which was a late 1969 and 1970 big block casting.

Your "HR" suffix code was never originally used on a Corvette, though. So, it came out of some other car. At the moment, I can't tell you exactly what car or application, but I will be able to later. However, I can tell you that it was built at the Van Nuys or Southgate California GM assembly plant by the "L" in the VIN derivative. So, it was likely a full size Chevrolet passenger car.