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Old 05-23-2017, 05:41 AM   #6
Doktor A (864-623-9110)
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Default Re: Engine Swap Info

Originally Posted by correllbil View Post
Could I use the short block route to use the 05 647 Engine?
A follow up: As your luck would have it, I needed to find my stash of 612 pistons for an engine repair.

My hunch was correct, the 612 piston crowns' valve reliefs are sized for the larger diameter tulip heads of the 612 valves and the 647 valve reliefs are accordingly smaller.

Thus it appears risky to bolt a 612 head onto a 647 short block.

Doktor A
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