Bought a Pontiac motor, I'm pretty sure it has a 350 block with #46 heads. I believe these head castings are from a 69 400/428, is this correct? If correct these heads should be 72 cc with 1.96" intake and 1.66" exhaust. I would like to put these heads on a 400. Is this a good combination? Can the bigger valves be machined into these heads (2.11"intake and 1.77"exhaust) ? Is it worth rebuilding these heads?
if motor is in good shape,the heads are worth haveing redone.
46 heads are for a 69 400 290hp valves are 2.11 , 1.77 , it didn't specify cc . pontiacpower.net
the block is stamped on the side, with the engine size if you're not sure.
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