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Bruce of MN · 03-02-2021, 07:23 PM

I have a 6:1 and an OD, installed at the same time, so not scientific. I do think that an OD with a stock head would be ok, unless you were in very hilly country. For the great benefits of the HC head, I would go for it, with the right gasket and break in.

03-02-2021, 07:23 PM	#31
Bruce of MN Senior Member Join Date: May 2010 Location: VA Posts: 1,411	Re: Mitchell Overdrive I have a 6:1 and an OD, installed at the same time, so not scientific. I do think that an OD with a stock head would be ok, unless you were in very hilly country. For the great benefits of the HC head, I would go for it, with the right gasket and break in.