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SDT1DYI · 04-30-2020, 10:33 AM

Valve shape does effect flow rates especially at low lift numbers along with critical seat angles in the head. To make the right decisions, you must have a flow bench and spend the time necessary on it. Other wise you are just guessing. If you want to compete in Stock Eliminator , you better have a very good set of heads that flow well from the .250-390 lift numbers for your 300hp SBC. 291, 041 etc heads.
Buying Dart or similar aftermarket NHRA approved head will get you out or the box better flow numbers.
But you then need to spend the time and money to get the intake runner volumes down to the NHRA CC specification.

Steve Teeter STK 620

04-30-2020, 10:33 AM	#10
SDT1DYI Member Join Date: Nov 2016 Location: Indianola Washington Posts: 401 Likes: 0 Liked 453 Times in 146 Posts	Re: Valve recommendations for Chevy Valve shape does effect flow rates especially at low lift numbers along with critical seat angles in the head. To make the right decisions, you must have a flow bench and spend the time necessary on it. Other wise you are just guessing. If you want to compete in Stock Eliminator , you better have a very good set of heads that flow well from the .250-390 lift numbers for your 300hp SBC. 291, 041 etc heads. Buying Dart or similar aftermarket NHRA approved head will get you out or the box better flow numbers. But you then need to spend the time and money to get the intake runner volumes down to the NHRA CC specification. Steve Teeter STK 620