[77 TRASHCAN]

Another note...
One of my Pontiac fellow enthusiast's told me, and I read the same in Jim Hand's book, that essentially ALL 67 and up "D" port heads have the same port shape/volume. Jim Hand says they are all around 153 cc's. Just for curiosity I measured the same port that I cc'd the chamber on. it was 150.5 cc's. The difference in most of those heads is the chambers and valve size. The deeper chambers changes the port alignment.

I have a 77 (from my car) and a 78 400. I might re-work the 17's, install 2.11 and 1.77 valves in them, give them a Jim Hand port job, and use them on a 400 (maybe) I'll have to evaluate the 400's first.

I think that the small valve (my opinion) 350's from 68-70 and all about the same chamber size as I measured, then in 71 the chambers got way bigger to knock the comp ratio down to 7.6:1 My motor book lists the 68 and 69 small valve 350's as 9.2:1.
Not knowing the deck height of a stock 350, it could even be less. I'm guessing at 8.25:1 w/ the 8.35 cc chambers using Jim Hand's compression ratio guide for the popular Pontiac engines on page 74 of his book. I found a head/compression ratio chart @ Wallace Racing, they list the 68 350's as 8.6:1, crap at least they are closer that my Motor Book.

One thing that Jim Hands tells you in his book, is to check every head for it's chamber volume, never to take it for granted...Thanks again Jim Hand!!!

One good thing I did uncover, I cc'd a chamber on a 6X-4 head, it came in @ 93 cc's. I was glad about that one, I've heard that some -4's can be quite a bit more...