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Jeff65 · 09-19-2002, 01:36 PM

I believe the heads have recesses for valve springs to permit heavier valve springs to support mechanical lifters. They also have screw in rocker arm studs vice pressed in to take the punishment of higher valve spring tension needed for high revs. I don't believe they'd produce higher hp unless used in connection with a performance camshaft. Modern heads are a better bet for high performance use with unleaded gas, GT40, ARP, etc. They flow a lot better which is the alternative to high compression ratio.

09-19-2002, 01:36 PM	#2
Jeff65 Registered Member Join Date: Jul 2002 Location: Oklahoma City Posts: 208	I believe the heads have recesses for valve springs to permit heavier valve springs to support mechanical lifters. They also have screw in rocker arm studs vice pressed in to take the punishment of higher valve spring tension needed for high revs. I don't believe they'd produce higher hp unless used in connection with a performance camshaft. Modern heads are a better bet for high performance use with unleaded gas, GT40, ARP, etc. They flow a lot better which is the alternative to high compression ratio.