Quote:
Originally Posted by 73T/A
As mentioned earlier both of the Pete McCarthy’s books show to different cams for GTO with manual transmission.
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Just circling back to this, because I am earnestly trying to help, and to clear up any confusion.
It appears as though your images are all from Pete's 'Racer's handbook';
This book was printed in 1981 - I have a copy of that one too, but rarely reference to it because I don't bracket race.
This book you are citing obviously has errors.
I shared images from the 1970 Pontiac service manual and Pete McCarthy's "bible" - both show the 068 was the L74 cam only.
If it matters, my book "Musclecar Performance 1955-1979" has a print date of 1989, and is the third printing of the fifth edition.
Also, we need to understand that authors make errors.
Just because you can find a print source, doesn't mean that it's fact.
Even model year (pre-production) literature can have errors.
For the 1970 model year:
L78 = 067
L74 = 068
period.