GM valves...hp limits?
GM valves...hp limits? Im going to be putting a L-92 based 427 in my car (L-92 block 4.07" bore with 4.1" stroke) and am thinking about using the L-92 heads with mild exhaust work. I would like to spray the house down on my car with a direct port dual stage (secondary fuel system and the like around 400 hit combined). I cant seem to locate a 2.16" intake valve anywhere besides the stock GM unit (ill be using 1.6" stainless exhaust).
Should I just try and cram a stainless 2.2" valve in the head (dont know if these will work all that well on a 4.07" bore) or just run the stock valves and not worry about it?
Thanks.
Nate
Should I just try and cram a stainless 2.2" valve in the head (dont know if these will work all that well on a 4.07" bore) or just run the stock valves and not worry about it?
Thanks.
Nate
Originally Posted by red90cobra
i would just use the stock valves they are pretty big as they are.
Originally Posted by Nate_Taufer
Yeah but are they gonna be able to handle the cylinder pressures introduced on a motor that will make around 550 rwhp with 400 hit on top?
I'm using the LS6 hollow stem valves. I've put about 25,000 miles on the engine, used a ton of nitrous, and probably have close to a hundred dyno pulls on the engine and it's never had a head related problem other than lifting the heads a couple of times. Runs 6.7s in the 1/8th. So I guess they are working fine for me.
The stock GM valves are pretty damn good. I remember brian Tooley old me he sent a set of stock GM 2.00 intake/ 1.55 exhaust valves out of a regular LS1 to a place that does fialure analysis. he also sent a Ferrea and a Turkish knockoff valve. The stock GM and Ferrea where nearly identical in quality..thats to say...very very high. The knockoff was complete crap.
I dont think you will have any issues running stock valves. I think your first issue would be when you get to a level that will require an upgrade in material for the exhuast valve. But man....thats a pretty big shot.
Id just use the stock GM stuff if you gonna be 1000 hp or less
I dont think you will have any issues running stock valves. I think your first issue would be when you get to a level that will require an upgrade in material for the exhuast valve. But man....thats a pretty big shot.
Id just use the stock GM stuff if you gonna be 1000 hp or less
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Originally Posted by 383LQ4SS
The stock GM valves are pretty damn good. I remember brian Tooley old me he sent a set of stock GM 2.00 intake/ 1.55 exhaust valves out of a regular LS1 to a place that does fialure analysis. he also sent a Ferrea and a Turkish knockoff valve. The stock GM and Ferrea where nearly identical in quality..thats to say...very very high. The knockoff was complete crap.
I dont think you will have any issues running stock valves. I think your first issue would be when you get to a level that will require an upgrade in material for the exhuast valve. But man....thats a pretty big shot.
Id just use the stock GM stuff if you gonna be 1000 hp or less
I dont think you will have any issues running stock valves. I think your first issue would be when you get to a level that will require an upgrade in material for the exhuast valve. But man....thats a pretty big shot.
Id just use the stock GM stuff if you gonna be 1000 hp or less
Nate
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Originally Posted by Nate_Taufer
Should I just try and cram a stainless 2.2" valve in the head (dont know if these will work all that well on a 4.07" bore) or just run the stock valves and not worry about it?
