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alum heads over iron heads

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alum heads over iron heads

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Old 04-27-2007, 02:40 PM
  #11  
FivePointOhh
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Default RE: alum heads over iron heads

that was my thought exactly! i wanna get boost down the road and thats a ton more heat in there. i'll find out the combustion chamber size. what size do i want? im pretty sure these gt-40's(non-p) are off an explorer or something current. i asked them but he didnt know. but they are completely reconditioned but the springs arent big enough for my cam, what size spring do i need? i think the b cam lifts to .512" but the springs on it go to .480". he said he would change them out no charge, what size do i need?
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Old 04-27-2007, 02:45 PM
  #12  
Sadistic1013
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Default RE: alum heads over iron heads

Although you do get better performance out of aluminum heads, like 351w8bang93stang said, Aluminum heads have a tendency to warp. If you enjoy replacing head gaskets a lot then i would say go with the aluminums.
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Old 04-27-2007, 03:00 PM
  #13  
OnyxCobra
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Default RE: alum heads over iron heads

I've only heard of aluminum heads warping if the engine overheats. Hundreds of people run aluminum heads that dont replace the head gaskets all the time, thats rediculous.

GT40 heads are stock on Cobras, they are an okay upgrade over the stock heads but they are far from great.
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Old 04-27-2007, 03:51 PM
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ih8chevy
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Default RE: alum heads over iron heads

i disagree wit the fact taht there are plenty of people making tons of power n.a wit iron gt40's or even e7s. and the aluminums are all good heads, eddy, trick flow, afr. all good stuff but there is plenty of power to be made wit stock stuff.
ORIGINAL: LTnone

If you're thinking about porting ford stock iron heads, just buy the aluminums. Ported "stockers" will rarely make as much power as aluminum heads (though some might come close), but that's as much power as you'll ever get out of them. Aluminum heads are lighter, and already flow well. Then you port them
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Old 04-27-2007, 05:30 PM
  #15  
mikethebike
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Default RE: alum heads over iron heads

ORIGINAL: Sadistic1013

Although you do get better performance out of aluminum heads, like 351w8bang93stang said, Aluminum heads have a tendency to warp. If you enjoy replacing head gaskets a lot then i would say go with the aluminums.
NOT true...iron heads with the same cnc port design will build more torque/hp as was stated earlier due to holding more hfeat in the chamber. Heat=horse power.
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Old 04-27-2007, 06:03 PM
  #16  
dthompson67
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Default RE: alum heads over iron heads

what is special about them being aluminum other then they are lighter? what if there were trick flow twisted wedge iron heads? which would you pick. depending on what engine size your gonna wanna match with your combustion size. stock 302 you wanta little combustion. so like gt40s milled down with big valves then ported would be nice. or a 347 with 351w heads milled and ported. almost any head can be good depending on how much money you want to spend.
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Old 04-27-2007, 06:38 PM
  #17  
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Default RE: alum heads over iron heads

It all depends on what you want out of your car, but from my understanding (sorry if I'm beating a dead horse) Iron is good because it can take a beating, aluminum weighs less so you gain a little there but potentionally lose longevity
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Old 04-27-2007, 07:02 PM
  #18  
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Default RE: alum heads over iron heads

Just to give an example; I made 305hp and 340tq to the wheels with AFR165's, do you think that would have been made with GT-40s ported and with bigger valves? Nope. For these guys saying aluminum heads warp and yadda yada...you are definitely not talking about street cars or daily drivers. A mild aluminum headed street car is not going to warp heads unless it overheats regularly. I cant say that I have ever heard of any one warping a set of aluminum heads on anything but a high boosted engine.
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Old 04-27-2007, 07:11 PM
  #19  
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Default RE: alum heads over iron heads

would anyone be able to tell me what size springs i would need for my b cam, i think im gonna buy those gt-40 heads but they come with .480" and i think the b cam lifts to .512" so what size spring do i need? .600" i dunno you tell me what i need. any input would help thanks!
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Old 04-27-2007, 07:12 PM
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ih8chevy
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Default RE: alum heads over iron heads

the b cam is a 480 lift cam.
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