musicman6120 wrote:

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Hi Everyone, 

 

I have a 72 LeMans with a 400 small block Chevy in it, which isn't original to the car. I have been trying to decode the engine with the numbers I found on the block. The numbers are as follows: T0123CSU, 330817, and 261702197. Thanks for the help greatly appreciated.

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 According to the casting# it is a 400 out of a 1976 passenger Oshawa built, I do not find a CSU code though, here are the numbers I have.

Thanks for the inf!

Thanks for all the great info. The guy that I purchased the car off of told me it was a 350 small block Chevy, but something didn't look right when I looked at the harmonic balancer and the flywheel. After some research I found out it was a 400 small block, just wasn't sure what it came out of. Plus it was backed by a TH350 which when I sent away for the build sheet of the car from GM Canada, it showed the car came with a 400 V8 4 bbl which I assumed was a Pontiac block, and it would have been mated to a TH400 with 3.73 twelve bolt rear end. Not sure what happened to the original motor and trans since the previous owner bought it out west some where, from the original guy that restored it. I had the rear end rebuilt this past summer and had 3.42 gears, because even the rear end gears weren't original, i think they had 2.50 gears in it and it was an open diff. It has a posi rear end now.

It must be from a 1974 Chevrolet full-size wagon, or possibly a Laurentian or Canadian Catalina Safari. The Chevy was upgraded to the 400 4-barrel LT4 as the base engine for 74, ditto for the Canadian Safaris.

Normally the 400 4-barrel in 74 was exclusive to California, except for the fullsize wagons where 49 states & Canada they ran them without a smog pump. All of them ran the TH400 trans.

Last car use was 76, last truck use was 1980. Good 400 cores are scarce today.