Cylinder Head Question?
Thread Starter
Intermediate
Joined: Sep 2002
Posts: 43
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From: Kyrkhult Blekinge
Cylinder Head Question?
Hello Vettegurus!
I have done some small changes in my engine but the next winter I will try to swap cam etc. My ques is if there isnt anyting I could do with my heads (128 alu) qoz here in sweden you have to has an large pile of money if you are going to by some new aftermarket heads. I will try to reach low 13 to high 12`s on the strip. I have read a lot of these heads that they are totally crap but with some porting and a good valve job there must be some performance gains or?
[Modified by Swede, 12:46 PM 5/8/2003]
I have done some small changes in my engine but the next winter I will try to swap cam etc. My ques is if there isnt anyting I could do with my heads (128 alu) qoz here in sweden you have to has an large pile of money if you are going to by some new aftermarket heads. I will try to reach low 13 to high 12`s on the strip. I have read a lot of these heads that they are totally crap but with some porting and a good valve job there must be some performance gains or?
[Modified by Swede, 12:46 PM 5/8/2003]
Team Owner
Joined: Dec 2000
Posts: 90,675
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From: SE NY
Cruise-In II Veteran
Re: Cylinder Head Question? (Swede)
I'm sure pocket porting & working your heads will be worth some nice HP gains, especially when combined with a cam, exhaust and intake work.
Check out the page on results of mods to a L98 on my site to see some of the gains to expect. For sure you can get into high 12s.
Check out the page on results of mods to a L98 on my site to see some of the gains to expect. For sure you can get into high 12s.
Le Mans Master
Joined: Dec 2000
Posts: 7,839
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From: San Diego, Ca
Re: Cylinder Head Question? (Swede)
I don't know what you mean by a pile of money. Ported 113's are available from Scoggin-Dickey for about $1300. If you go this route, make sure they use the latest castings from GM Performance Parts as they include heavy duty valve springs. Web is http://www.sdpc2000.com if you want to order a free catalogue (I don't believe these heads are shown online).
Drifting
Joined: Dec 2002
Posts: 1,861
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From: Houston TX
Re: Cylinder Head Question? (SunCr)
I ported my 128's and gained ~40 cfm on the intake side at 0.500" lift (with gains ALL across the lift range) and even greater gains on the exhaust side. I haven't dyno'd the motor with the head work yet, but I did pick up 0.7 sec and 8 mph in the 1/4 after my head work.
Team Owner
Joined: Sep 2001
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Re: Cylinder Head Question? (Swede)
Those heads arent the best, but if you port them out then theyll flow pretty good.
If you went aftermarket, go with AFR 190s.
If you went aftermarket, go with AFR 190s.
