1968 engine stamping

[Jim B.]

I am rebuilding the motor in my 68 327/350. The car is a 4 sp. with A/C only, no P/S or P/B. I am not the original owner so it's originality is unknown. My question is should the motor be stamped with a HP or HT. The Tech. Manual list both.

[Jack H.]

Re: 1968 engine stamping

Guess I don't see the question/issue...

The HP suffix code in my book relates to a 327/300 engine with MT, A/C, and PB. The only code for a 327/350 engine is HT regardless of other options.

[Lou C.]

Re: 1968 engine stamping

1968 HP code is for 350 HP, Manual trans, P/S & A/C

[Jack H.]

Re: 1968 engine stamping

That's a hoot...there's an ERROR in the Corvette Black Book! It says what I recited but that's in conflict with what's listed in the NCRS JG book as well as Hollanders!

The NCRS JG says:

HP= 327/350 with MT, P/S and A/C
HT= 327/350 with MT

Here's the Black Book table I cited...

[Tom H.]

Re: 1968 engine stamping

NCRS pocket spec book also lists the HP suffix as base motor 327/300 with MT / AC and PS.

I assume this is in error and I should make a correction in the book ?

[Tom H.]

Re: 1968 engine stamping

That's a hoot...there's an ERROR in the Corvette Black Book! It says what I recited but that's in conflict with what's listed in the NCRS JG book as well as Hollanders!

The NCRS JG says:

HP= 327/350 with MT, P/S and A/C
HT= 327/350 with MT

Here's the Black Book table I cited...

I think you may have an old Black Book. Mine shows the HP suffix as 350HP MT/PS/AC.

[Paul B.]

Re: 1968 engine stamping

I have two original "HT" 327/350hp 1968 cars. One is a coupe, no A/C, manual steering & manual brakes. Other is a power steering, power brake convertible, also no A/C.

...this issue has come up a few good times in my 10yrs on the InterWeb on 1968 Corvettes.

[Bryan M.]

Re: 1968 engine stamping

My '68 build number 4888 327/350hp with ps, pb, 4-speed, with a/c has the HT code stamped on it. Has anybody ever seen a 68 with the HT code in this configuration?

[Jim T.]

Re: 1968 engine stamping

Jim what does your engine have stamped, HP or HT?

My original owner 68 has the 327/350 HT original engine. No a/c, pwr brakes, or pwr steering.

Kurt Bunting has a 68 with a/c perhaps he will see the post and tell us what stamping he has.

[Jim B.]

Re: 1968 engine stamping

Thanks Jim, My motor casting is the 678, the date is right for the block and heads. I asume that the motor has been rebuilt once or? as the block has been decked. You use another gentlemans opinion to your answer, would he have any insight to my problem? Thanks in advance,
Jim Benedict

[John P.]

Re: 1968 engine stamping

The casting # on my 1968 327 ends with "HE" (VO717HE).
300 hspwr, 4sp., PS, PB..
Best to the Board.

John Pratt

[James G.]

Re: 1968 engine stamping

I believe "HP" is correct for 327/350hp WITH AC and Power Steering. Same code on 66 and 67 cars also. I had a 66 with 350hp, air conditioning, power steering and K-19 California Smog pump. That engine was "KH"

I have seen some "HT" stamps on 327/350 air conditioned cars over the years, but never at a judged NCRS meet.

[Bryan M.]

Re: 1968 engine stamping

I believe "HP" is correct for 327/350hp WITH AC and Power Steering. Same code on 66 and 67 cars also. I had a 66 with 350hp, air conditioning, power steering and K-19 California Smog pump. That engine was "KH"

I have seen some "HT" stamps on 327/350 air conditioned cars over the years, but never at a judged NCRS meet.

The "HT" engine stamping has always puzzled me about my car. Is it because my car also has power brakes that it kept the "HT" stamp?

[John H.]

Re: 1968 engine stamping

The "HT" engine stamping has always puzzled me about my car. Is it because my car also has power brakes that it kept the "HT" stamp?

Bryan -

With or without power brakes has no impact on the engine configuration/suffix.

[Bryan M.]

Re: 1968 engine stamping

Bryan -

With or without power brakes has no impact on the engine configuration/suffix.

John,
Do you know the reason why a 68 with a/c would have the HT engine stamp?