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yes.

I you have the six pack pistons, and a stockish cam, you might have detonation problems on pump gas

I have 915 heads on my 70 six pack engine with ross flat top pistons 990 pin and eagle rods. at 0 deck height.looks bone stock. insane amount of power. i would highly recommend them. polish your combustion chamber to get rid of the hot spots. If you make the combustion chamber efficient it is possible to run it on premium if the engine is tuned properly.



I had ported, milled 516s w/ bigger valves w/ "six pack" pistons 528 solid and a 6 pack ran great until #4.