1978 Z28 Engine Code

[TheFastForester]

If you look through all the pages of research I've done I've yet to find a 78 Z/28 automatic with the CHS code. CHS from my research is 100% a manual transmission code for the 78Z. I set out on this mission years ago to see for myself that the GM reference info that people have used for this site, and others, seems faulty in this regard.

 

[TheFastForester]

I have found documentation on this site saying that some 4-speed cars got the CHS code engine.

Also, if you go back to the first few pages of this thread you'll see when that info changed on this site.

 

[TheFastForester]

1978 Z/28 4-speed M/T CHS code.

 

[HighSpeedLowDrag]

Hello all. I was asked to upload my 78 Z build sheet. Here you go!

 

[HighSpeedLowDrag]

Here is a better picture.

TheFastForester​

Any idea how many California 78 Z28's were made with the automatic trans?

 

[Z28SSRS]

Every California 1978 Z28 came with an automatic trans as the 4 speed was not available in California. That being said I don't think there is a record anywhere of how many 1978 Z28's were built for sale in California. I think the Van Nuys assembly plant even made 1978 Z28's with a 4 speed; they just couldn't be sold in California.

 

[wped777]

My thanks the TheFastForrester for doing all of his research to clarify the CHS suffix code for 1978 Z28 with a BW SuperT10.
My 1978 Z28 numbers matching, one owner, with full documention, 4sp BW has the CHS suffix. The engine serial number is gang stamped, but the CHS code does not appear to be. The S is a little higher than the CH.
As was stated before in this forum, Chevrolet's record keeping could be a little suspect in some areas. Again, thanks to TheFastForrester.

 

[TheFastForester]

My thanks the TheFastForrester for doing all of his research to clarify the CHS suffix code for 1978 Z28 with a BW SuperT10.
My 1978 Z28 numbers matching, one owner, with full documention, 4sp BW has the CHS suffix. The engine serial number is gang stamped, but the CHS code does not appear to be. The S is a little higher than the CH.
As was stated before in this forum, Chevrolet's record keeping could be a little suspect in some areas. Again, thanks to TheFastForrester.

You are most welcome, I'm glad the info has helped fellow 1978 Z28 M/T owners!

 

[TheFastForester]

Here is a better picture.

TheFastForester​

Any idea how many California 78 Z28's were made with the automatic trans?


View attachment 153071

Thank you! CHT seemed to be the favored stamp for the Cali A/T Z's.

 

[HighSpeedLowDrag]

Thank you! CHT seemed to be the favored stamp for the Cali A/T Z's.

I think your quote mess up Forester