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Crankster · 07-21-2021, 02:45 PM

Hi Jim - a 6.5 is suitable in many if not most instances, for stock or stockish engines. This is what is provided with most carburetors and rebuild kits. If you live at high altitude, and/or have a performance cam in the engine the manifold vacuum will be lower under all operating conditions and a lower number power valve would be needed.

07-21-2021, 02:45 PM	#2
Crankster Senior Member Join Date: Oct 2017 Posts: 563	Re: 292 fall down on acceleration Hi Jim - a 6.5 is suitable in many if not most instances, for stock or stockish engines. This is what is provided with most carburetors and rebuild kits. If you live at high altitude, and/or have a performance cam in the engine the manifold vacuum will be lower under all operating conditions and a lower number power valve would be needed.