318 Difference?

jimynick said

Be careful if you go with early 273 heads since I seem to remember they had a different intake bolt pattern on them. As for the crank going .020 under- don't sweat it; I've had them .030 under and not a problem. The gentleman's advice about a hillbilly hone job is not just talk. Don't ask me how I know this, please.

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Yes, the 64 and 65 heads have the different angle intake manifold bolts. those are 2465315 and are supposed to have 57 cc chambers.

He could get a set of 66 or 67 heads 2536178 & 2658920 are supposed to have 57 cc chambers.

The next "step" would be the 2843675 that are 68 - 71 and supposed to have 60 cc chambers.

The 77 heads are 4027163 or 4027593 castings are supposed to have 63 cc chambers.


The 67 - 69 piston compression height is 1.759".

The 70 - 71 piston compression height is 1.750".

The 72 - 78 piston compression height is 1.739".