[scott70]

Originally Posted by unruhjonny

interesting.

I don't recall reading (or noticing an instance of a drivetrain that would have had the 068 with a stick being changed to a 067 because of the automatic (ect).

I know the 70 gto 455 came with the 068 cam with a manual trans and the 067 with the thm400. Only diffrerence between the different cams was the transmission choice.

[Formulajones]

Originally Posted by scott70

I know the 70 gto 455 came with the 068 cam with a manual trans and the 067 with the thm400. Only diffrerence between the different cams was the transmission choice.

Kind of interesting how they did that in a 455, yet the RAIII 400 engine of 1970 just came with the 068 cam no matter what trans you chose. Considering the 068 would act much bigger in a 400 and wouldn't even put a dent in a 455.

[PAUL K]

Originally Posted by Formulajones

Kind of interesting how they did that in a 455, yet the RAIII 400 engine of 1970 just came with the 068 cam no matter what trans you chose. Considering the 068 would act much bigger in a 400 and wouldn't even put a dent in a 455.

Pontiac did away with 744 cam in mid 1969 I believe. They were having complaints about cold start rough idle in Northern climates. Before that the four speed cars with 48 heads came with the 744 cam (and stiff valve springs) and automatics got the 068.

[scott70]

Originally Posted by Formulajones

Kind of interesting how they did that in a 455, yet the RAIII 400 engine of 1970 just came with the 068 cam no matter what trans you chose. Considering the 068 would act much bigger in a 400 and wouldn't even put a dent in a 455.

Yes,,,when I bought my GTO the motor had never been touched internally. Still had the 068 'S" cam and nylon covered timing chain. With that cam it idled like a kitten but had a good low rpm pull. Now a RA4 sized cam with Rhoads and its only a little choppy,,,still pretty smooth.