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#1 |
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1969 Chevy 350 300hp with double hump heads 1.94 1.50 valves. What valve is recommended for a stocker?
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#2 |
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I am a Mopar guy but......
I thought the 1.94 Heads had the same size 1.60 Exhaust that my beloved Mopars did. Yes I know they are not the same valve but similar size. I prefer a fairly flat (Not tulip) valves.
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John Irving 741 Stock 741 Super Stock Last edited by GTX JOHN; 04-29-2020 at 02:27 PM. |
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#3 |
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Ferrea
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#4 |
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#5 |
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FWIW - Manley has some nicely shaped 1.94" stuff. Nice flat backside. Most manufacturers have 12deg to 15deg backsides. Look for ones that are 10deg if you can.
![]() Now on that comment, opinions may vary, but facts won't. ![]() Regards, HB2 IG ![]() |
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#6 |
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So non tulip would slightly help fill compression if I have the cc’s in the chamber?
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#7 |
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Typically you would start with a bigger valve and shape it down to 1.945. On the exhaust, a tulliped valve is some time used on a 23 degree head. All these modifications are based on flow testing as you go, because on a stocker IT ALWAYS comes down to flow through the intake tract. We use Ferrea valves usually.
Last edited by HP HUNTER; 04-29-2020 at 08:27 PM. |
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#8 |
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#9 |
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Maybe he should or maybe he shouldn’t. ? One thing is for sure , if he calls Jim Lewis, and waits in the front window for the brown truck to arrive .... He will be a HAPPY CAMPER when he opens that box.....
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#10 |
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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 |
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