Re: Head swap between flathead engines - A QUESTION ????

Posted by Jon Hagen on September 05, 2001 at 20:27:44 from (63.160.194.93):

In Reply to: Head swap between flathead engines - A QUESTION ???? posted by Amateur Mechanic on September 05, 2001 at 14:26:56:

The smaller head chamber will increase your compression ratio and increase cranking load If the final compression ratio is not above 8.5-9 to 1 you should be ok on regular gas.
Your neighbour is right that all small block Chevy heads will interchange as far as to bolting to the block.But if you bolt a 305 head with it's tiny combustion chamber on a sb 400, it will have near 15 to 1 compression and will detonate itself to death in a few miles.

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