Valve recommendations for Chevy

mcashman · 04-28-2020, 08:09 AM

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

GTX JOHN · 04-28-2020, 12:19 PM

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.

Tim H · 04-28-2020, 04:24 PM

Ferrea

MR DERBY CITY · 04-28-2020, 05:21 PM

Quote:

Originally Posted by mcashman

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

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

Dissident · 04-28-2020, 05:58 PM

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

mcashman · 04-28-2020, 08:10 PM

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

HP HUNTER · 04-29-2020, 08:24 PM

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.

HP HUNTER · 04-30-2020, 08:20 AM

Quote:

Originally Posted by MR DERBY CITY

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

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

MR DERBY CITY · 04-30-2020, 10:18 AM

Quote:

Originally Posted by HP HUNTER

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

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.....

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

04-28-2020, 08:09 AM	#1
mcashman Junior Member Join Date: Oct 2007 Location: Westminster MD Posts: 82 Likes: 16 Liked 6 Times in 3 Posts	Valve recommendations for Chevy 1969 Chevy 350 300hp with double hump heads 1.94 1.50 valves. What valve is recommended for a stocker?

04-28-2020, 12:19 PM	#2
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,720 Likes: 2,770 Liked 2,437 Times in 688 Posts	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. __________________ John Irving 741 Stock 741 Super Stock Last edited by GTX JOHN; 04-29-2020 at 02:27 PM.

04-28-2020, 04:24 PM	#3
Tim H VIP Member Join Date: Jan 2007 Posts: 1,040 Likes: 1,064 Liked 481 Times in 158 Posts	Re: Valve recommendations for Chevy Ferrea

04-28-2020, 05:58 PM	#5
Dissident Member Join Date: Jan 2016 Location: Colorado hills Posts: 123 Likes: 11 Liked 73 Times in 36 Posts	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. Now on that comment, opinions may vary, but facts won't. Regards, HB2 IG

04-28-2020, 08:10 PM	#6
mcashman Junior Member Join Date: Oct 2007 Location: Westminster MD Posts: 82 Likes: 16 Liked 6 Times in 3 Posts	Re: Valve recommendations for Chevy So non tulip would slightly help fill compression if I have the cc’s in the chamber?

04-29-2020, 08:24 PM	#7
HP HUNTER Senior Member Join Date: Feb 2012 Location: Colorado Springs Colorado/Thousand Oaks Ca Posts: 656 Likes: 82 Liked 371 Times in 129 Posts	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. Last edited by HP HUNTER; 04-29-2020 at 08:27 PM.

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