I thought the pre-1954 (up to 53) 216 and 235's were the same and after that they early ones were different from the later ones. I was under the impression that this was the result of the change in the oiling system so the newer heads have the intake ports a smidge further apart?
'51 Chevy 1/2 ton w/'62 261, HEI, offy, fentons, dual carter/webbers, t-5 & 12 bolt posi
| 
