STOCK L98 HEADS - possible power level ?
Thread Starter
Racer
Joined: Dec 2005
Posts: 361
Likes: 0
From: Russia, Moscow
STOCK L98 HEADS - possible power level ?
Hi guys!
I have STOCK L98 Corvette HEADS, non-ported (is strong cleaned and easily polished), 350, 8:1 CR,
cam 224/224 114lsa, valve lift .562/.562 w/1.6 rr, Ferrea SuperAlloy valves(stock size 1.94 & 1.5), 18-20 psi boost w/twin T62-1's + intercooler + meth.injection.+ tpis MR-I intake w/Monoblade TB
Question:
It is possible to receive 800-900 HP with these STOCK HEADS in my setup?
It is necessary to change it on aftermarket heads with large flow?
Some guys laugh
, when hear from me, that I want to have "BIG POWER" with STOCK HEADS.
At me of doubt in it is I think, that aftermarket super-flow heads are important ONLY on N/A motor.
I am not right?
Thank.
I have STOCK L98 Corvette HEADS, non-ported (is strong cleaned and easily polished), 350, 8:1 CR,
cam 224/224 114lsa, valve lift .562/.562 w/1.6 rr, Ferrea SuperAlloy valves(stock size 1.94 & 1.5), 18-20 psi boost w/twin T62-1's + intercooler + meth.injection.+ tpis MR-I intake w/Monoblade TB
Question:
It is possible to receive 800-900 HP with these STOCK HEADS in my setup?
It is necessary to change it on aftermarket heads with large flow?
Some guys laugh
, when hear from me, that I want to have "BIG POWER" with STOCK HEADS.At me of doubt in it is I think, that aftermarket super-flow heads are important ONLY on N/A motor.
I am not right?
Thank.
Last edited by divette; Nov 11, 2006 at 09:47 AM.
Thread Starter
Racer
Joined: Dec 2005
Posts: 361
Likes: 0
From: Russia, Moscow
big test of heads:
http://www.chevyhiperformance.com/te.../photo_08.html
For example - we take Stock 163cc and TrickFlow 195cc:
It will be so:
( Stock .500 lift = 196 intake) VS (TrickFlow .500 lift = 250 intake)
(This test be in N/A-mode!!!)
BUT!
Stock + only! 5 PSI - It WILL BE BETTER, than TrickFlow in N/A-mode
Therefore:
(Stock .500 lift + 5 psi = 250+ ) VS (TrickFlow .500 lift = 250 )
But, if add +5 psi to both heads, it will be better TrickFlow:
(Stock .500 lift + 5 psi = 250+ ) VS (TrickFlow .500 lift + 5 psi = 250+++ )
TrickFlow it is better, BUT Stock can be performance, if to it give BOOST.
This my opinion
- is ready to listen to a refutation to this.
http://www.chevyhiperformance.com/te.../photo_08.html
For example - we take Stock 163cc and TrickFlow 195cc:
It will be so:
( Stock .500 lift = 196 intake) VS (TrickFlow .500 lift = 250 intake)
(This test be in N/A-mode!!!)
BUT!
Stock + only! 5 PSI - It WILL BE BETTER, than TrickFlow in N/A-mode
Therefore:
(Stock .500 lift + 5 psi = 250+ ) VS (TrickFlow .500 lift = 250 )
But, if add +5 psi to both heads, it will be better TrickFlow:
(Stock .500 lift + 5 psi = 250+ ) VS (TrickFlow .500 lift + 5 psi = 250+++ )
TrickFlow it is better, BUT Stock can be performance, if to it give BOOST.
This my opinion
- is ready to listen to a refutation to this.
Drifting
Joined: Dec 2001
Posts: 1,313
Likes: 1
From: providence ut
I ran 8 psi on my stock 85 and hit a wall at 5500 rpm.......even with the boost the intake system and cam would not rev...........299.8 rwh on the dyno..........cam will help but the heads are a chocking point even with boost
Thread Starter
Racer
Joined: Dec 2005
Posts: 361
Likes: 0
From: Russia, Moscow
Originally Posted by lead foot 85 vet
I ran 8 psi on my stock 85 and hit a wall at 5500 rpm.......even with the boost the intake system and cam would not rev...........299.8 rwh on the dyno..........cam will help but the heads are a chocking point even with boost
.......
Thread Starter
Racer
Joined: Dec 2005
Posts: 361
Likes: 0
From: Russia, Moscow
Thread Starter
Racer
Joined: Dec 2005
Posts: 361
Likes: 0
From: Russia, Moscow
Instructor
Joined: Apr 2006
Posts: 194
Likes: 0
From: edmonton alberta
why would you waste your time and money with the stock heads?you can spend twice as much to race prep them, then it would cost you to get some afr ,brodix,or trickflow heads and they still wont flow as good.their just to small to make 800-900 hp their only so much material you can work with when you port them ,and as for power level no matter how much boost you crank out your going to hit a "wall" no more power no matter what ,i can see you maybe with stock race ported heads making hp in the 500 range,but 900hp no way ,go out buy some afr heads or you can stick with the 20 year old technology and choke your engine,but you posted this same question about 5 times and everyone has told you no way you can make that kind of power with those heads and you don't believe it,save your self the headaches go buy some AFR heads you wont regret it ,good luck
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Team Owner
Joined: Mar 2001
Posts: 30,858
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From: Boston, Dallas, Detroit, SoCal, back to Boston MA
Originally Posted by lead foot 85 vet
I ran 8 psi on my stock 85 and hit a wall at 5500 rpm.......even with the boost the intake system and cam would not rev...........299.8 rwh on the dyno..........cam will help but the heads are a chocking point even with boost
Drifting
Joined: Dec 2001
Posts: 1,313
Likes: 1
From: providence ut
Originally Posted by BrianCunningham
That's the runner length talking. You need a different intake to get more performance at a higher rpm. Put a miniram or LT1 intake on it.
Melting Slicks
Joined: Jan 2002
Posts: 3,293
Likes: 79
From: Jackson MI
Can you make lots of horsepower on stock heads? YES
With the same setup can you make a bunch more power with aftermarket heads? YES!
The obvious solution is to just "turn up the boost" as every ricer knows. But there is a limit to how much you can up the boost before it stops giving you more horsepower.
If you look at all the stock FI engines out there most of the people that want more horsepower out of them don't even bother pulling off the valve covers. Its all fuel, air, and IC. But those that want the most ouf of their setup will do the head porting and see good gains from it.
My advice to you is to try it. Do it with stock heads and see how it dyno's out? Try it at different boost levels and calculate your hp/# of boost increase. If it doesn't make your goal then spend a weekend and do a head swap and retune the thing. You'd be supprised how many trends got started with someone just trying something.
With the same setup can you make a bunch more power with aftermarket heads? YES!
The obvious solution is to just "turn up the boost" as every ricer knows. But there is a limit to how much you can up the boost before it stops giving you more horsepower.
If you look at all the stock FI engines out there most of the people that want more horsepower out of them don't even bother pulling off the valve covers. Its all fuel, air, and IC. But those that want the most ouf of their setup will do the head porting and see good gains from it.
My advice to you is to try it. Do it with stock heads and see how it dyno's out? Try it at different boost levels and calculate your hp/# of boost increase. If it doesn't make your goal then spend a weekend and do a head swap and retune the thing. You'd be supprised how many trends got started with someone just trying something.
Thread Starter
Racer
Joined: Dec 2005
Posts: 361
Likes: 0
From: Russia, Moscow
Originally Posted by BrianCunningham
That's the runner length talking. You need a different intake to get more performance at a higher rpm. Put a miniram or LT1 intake on it.
I have TPiS MR-I intake with Monoblade TB 1300 CFM
(see my first message)
Last edited by divette; Dec 10, 2006 at 12:00 AM.
Racer
Joined: Jan 2004
Posts: 291
Likes: 0
From: Norton ma
I think this is exactly what you are asking for.
http://www.turbomustangs.com/smf/ind...?topic=61219.0
Cliffs:
-Third gen firebird
-3 speed auto
-junkyard 100'000 mile 2 bolt 350
-smog 487x heads
-comp 268 cam
-Two grand national turbos
-powerwashed the inside of the engine.
-Nitrous
-9.75@ 141.50
-662HP and 728 ft.lbs torque at the wheels through a 20-30% loss drivetrain.
http://www.turbomustangs.com/smf/ind...?topic=61219.0
Cliffs:
-Third gen firebird
-3 speed auto
-junkyard 100'000 mile 2 bolt 350
-smog 487x heads
-comp 268 cam
-Two grand national turbos
-powerwashed the inside of the engine.
-Nitrous
-9.75@ 141.50
-662HP and 728 ft.lbs torque at the wheels through a 20-30% loss drivetrain.
