Valve recommendations for Chevy
 

1969 Chevy 350 300hp with double hump heads 1.94 1.50 valves. What valve is recommended for a stocker?

Re: Valve recommendations for Chevy
 

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.

Re: Valve recommendations for Chevy
 

Ferrea

Re: Valve recommendations for Chevy
 

I always had the best results with 8 exhaust and 8 intake valves...Results may vary....

Re: Valve recommendations for Chevy
 

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.:D
Now on that comment, opinions may vary, but facts won't.:cool:
Regards,
HB2
IG:)

Re: Valve recommendations for Chevy
 

So non tulip would slightly help fill compression if I have the cc’s in the chamber?

Re: Valve recommendations for Chevy
 

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.

Re: Valve recommendations for Chevy
 

Maybe the OP should do what you do........call Jim Lewis and wait in the front window for the UPS truck to show up:D

Re: Valve recommendations for Chevy
 

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.....

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

Re: Valve recommendations for Chevy
 

Steve, I am not aware of anyone that can get the approved head Intake runner volume to the correct CC. Can you fill me in on who is able to do that.

Re: Valve recommendations for Chevy
 

There are a couple of Dart sets out there on Brian Tilburg motors that are very fast on F and G cars.
Brian is in PA.

Steve Teeter Stk 620.