[rob6773]

To run 1.65 my heads needed a lot of work to fit the pushrods. A higher ratio than that might need too much cut out of the head. I think there are very few pontiac heads that can use 1.65 without moding.

[U47]

Originally Posted by rob6773

To run 1.65 my heads needed a lot of work to fit the pushrods. A higher ratio than that might need too much cut out of the head. I think there are very few pontiac heads that can use 1.65 without moding.

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A little off to my original topic but I used 1.65's on my 455 with #15 small valve heads and now I'm using a set of 7K3's on the same engine with no problems with pushrods hitting the head.
I just want to know why Chevy's with a I-6 and 1.75 rockers don't break rocker studs.



D.