best head for FI
best head for FI I was wondering what my best option is for a cylinder head for a 402 or a 408buildup? Im currently running a D1sc that I will either try to max out or im considering selling it and getting an F1a. I dont want to run into problems lifting the heads so obviously im going to want a thick deck, I wouldent mind picking up some extra power, and something fully assembled ready to bolt on would be nice. If you know please specify deck thickness.
402 My buddys running a 402 incon setup and hes pushing 800 to 850HP with stage 3 turbos and hes using ported ls6 heads with intake with no problems whats so ever,so i opted for ls6 heads and intake to on my 364 build like he did ! its stubid to waste big money on afr or comparable heads when its being pushed threw them anyways!!!Now on naturally aspirated!!!!you cant spend enough or let me rephase hve them ported enough i rephased the spend part because of the fairlly desentlly priced l92 heads that flow just as good as there almost doubled cost when comparing to AFRs LOL!! good luck guy !!!
Afr, ET heads, All Pro, Trick Flow, World Product...
Take your pick. They are all nice thick deck heads. There is a point to using them otherwise everyone would rock ported stock castings. The thick deck helps against lifting the heads and usually flow more than ported castings with a smaller runner.
For one it's not stubid to buy an aftermarket casting head. You're talking about the air being pushed through them. Yes, it is but what happens if you can flow the same amount of air more easily through the same amount of space? Less boost is the answer. There was a large discussion about this in the recent Patrick G intake manifold thread. Boost is only a measure of restriction, flow is what truely matters.
Also the L92s aren't all they are cracked up to be in NA applications. They flow well, with a huge 260cc runner. You're trying to compare that to something like a 225cc AFR head that only flows slightly less.
L92 head specs:
Valve dimensions:
Intake = 2.160” X 4.870” X .314”(8mm)
Exhaust = 1.590” X 4.920” X .314”(8mm)
Seat/throat diameters:
Intake = 1.870”
Exhaust = 1.355”
Volumes:
Intake runner = 260.6cc
Exhaust runner = 90.0cc
Chamber = 69.8cc
Take your pick. They are all nice thick deck heads. There is a point to using them otherwise everyone would rock ported stock castings. The thick deck helps against lifting the heads and usually flow more than ported castings with a smaller runner.
its stubid to waste big money on afr or comparable heads when its being pushed threw them anyways!!!Now on naturally aspirated!!!!you cant spend enough or let me rephase hve them ported enough i rephased the spend part because of the fairlly desentlly priced l92 heads that flow just as good as there almost doubled cost when comparing to AFRs LOL!! good luck guy !!!
Also the L92s aren't all they are cracked up to be in NA applications. They flow well, with a huge 260cc runner. You're trying to compare that to something like a 225cc AFR head that only flows slightly less.
L92 head specs:
Valve dimensions:
Intake = 2.160” X 4.870” X .314”(8mm)
Exhaust = 1.590” X 4.920” X .314”(8mm)
Seat/throat diameters:
Intake = 1.870”
Exhaust = 1.355”
Volumes:
Intake runner = 260.6cc
Exhaust runner = 90.0cc
Chamber = 69.8cc
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TECH Addict
Joined: Apr 2002
Posts: 2,417
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From: Waldwick, NJ
i was told that et heads are 7/8s thick, can anyone verify that? also I had a friend that went to the lsx shootout and he told me that almost every fast car there was running et heads, that sounds pretty convincing.
I plan to run 240 ET heads when I do the swap. I'm trying to find out if I can get the 6-bolt version and run if on my LS1 block until I build my LSX. Anyone know if the bolt pattern is the same except for the 2 extra bolts?
TECH Resident
Joined: Jan 2007
Posts: 751
Likes: 0
From: Texas
[QUOTE=Beaflag VonRathburg;8195497]Afr, ET heads, All Pro, Trick Flow, World Product...
Take your pick. They are all nice thick deck heads. There is a point to using them otherwise everyone would rock ported stock castings. The thick deck helps against lifting the heads and usually flow more than ported castings with a smaller runner.
For one it's not stubid to buy an aftermarket casting head. You're talking about the air being pushed through them. Yes, it is but what happens if you can flow the same amount of air more easily through the same amount of space? Less boost is the answer. There was a large discussion about this in the recent Patrick G intake manifold thread. Boost is only a measure of restriction, flow is what truely matters.
Also the L92s aren't all they are cracked up to be in NA applications. They flow well, with a huge 260cc runner. You're trying to compare that to something like a 225cc AFR head that only flows slightly less.
I vote AFR's simply because I have not seen another car make as much power as mine on 9.4psi with 11.4 afr & 14* at 6k. They must flow pretty well. Numbers in sig
Take your pick. They are all nice thick deck heads. There is a point to using them otherwise everyone would rock ported stock castings. The thick deck helps against lifting the heads and usually flow more than ported castings with a smaller runner.
For one it's not stubid to buy an aftermarket casting head. You're talking about the air being pushed through them. Yes, it is but what happens if you can flow the same amount of air more easily through the same amount of space? Less boost is the answer. There was a large discussion about this in the recent Patrick G intake manifold thread. Boost is only a measure of restriction, flow is what truely matters.
Also the L92s aren't all they are cracked up to be in NA applications. They flow well, with a huge 260cc runner. You're trying to compare that to something like a 225cc AFR head that only flows slightly less.
I vote AFR's simply because I have not seen another car make as much power as mine on 9.4psi with 11.4 afr & 14* at 6k. They must flow pretty well. Numbers in sig
The 6 bolt version is the same except for the two extra bolts. They will bolt right up to any standard 4 bolt LS block. Just specify GM LSX 6 bolt pattern when ordering.
The aftermarket heads do have there advantages in the forced induction world. I went with allpros as well.
3/4 deck.
Cooling passages decreased to improve strength.
340cfm intake at .600
280cfm exhaust at .600
The ET heads have even more options. The aftermarket heads are going to offer everything a ported stock head is with the addition of strength, reliability, flexability and room to grow. Go big now and you will not have to do it later.
3/4 deck.
Cooling passages decreased to improve strength.
340cfm intake at .600
280cfm exhaust at .600
The ET heads have even more options. The aftermarket heads are going to offer everything a ported stock head is with the addition of strength, reliability, flexability and room to grow. Go big now and you will not have to do it later.
