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03-04-2012, 07:38 AM
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#1
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$419$ FTW
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cast vs. aluminum heads
Hey guys serious opinions on this please I have a 85 montecarlo ss and. I want to either port heads I have which are cast on the 327ci or upgrade to dart aluminum heads but everyone know these different materials expand and contract at different rates so blowing head gaskets got in my mind, this being a street car and track car once in awhile I. Really don't think it will ever get that hot to worry. But any ones opinion that runs aluminum on cast. Or any experience with this situation would be much apreciated
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03-04-2012, 09:00 AM
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#2
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Resident Rocket Scientist
Join Date: Jun 2004
Location: Mass
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I think you mean Iron vs Aluminum.
AFAIK almost all production cylinder heads are cast initially and then finished up by a CNC mill which brings them into spec, this may or may not include a port job.
That being said, you should just get the aluminum heads. Dissimilar metals isn't really a huge concern, you can always install ARP head studs and get a ton of clamping force if you are worried. The aluminum heads will weigh a lot less and flow a lot more air and the reward far outweighs the risks.
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Originally posted by Blues Clues Opie:"Your constant grammatical and spelling errors do not bode positively in your direction against the forever looming power of ‘shens’."
ST:Almost Serious
Last edited by DRock : 03-04-2012 at 09:44 PM.
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03-04-2012, 09:09 AM
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#3
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$419$ FTW
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I guess I should of been more specific just most people in the sprint car world say cast or aluminum my bad just habit I suppose
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03-04-2012, 01:03 PM
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#4
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|TRUTH|
Join Date: Aug 2007
Location: Ontario, Canada
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Quote:
Originally Posted by DRock
I think you mean Iron vs Aluminum.
AFAIK almost all production cylinder heads are cast initially and then finished up by a CNC mill which brings them into spec, this may or may not include a port job.
That being said, you should just get the aluminum heads. Dissimilar metals isn't really a huge concern, you can always install ARP head studs and get a ton of clamping force if you are worried. The aluminum heads will weigh a lot less and flow a lot more air and the rewards far outweigh the risks.
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fixed for you. 
__________________
'10 Infiniti G37x
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03-04-2012, 01:30 PM
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#5
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Greek, I am it
Join Date: May 2007
Location: Terrain eval, standby
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How many cars these days don't have aluminum heads? ****, the LS series even has aluminum blocks. Don't worry about heat expansion. Unless your **** is waaaaay overheating there isn't an issue.
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And the machine is bleeding to death.
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03-04-2012, 02:34 PM
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#6
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Mr Diet Coke on the Rocks
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Ceramic is the way to go .
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03-04-2012, 03:32 PM
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#8
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Tree Fitty
Join Date: Nov 2006
Location: Pittsburgh, PA
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I have aluminum heads on an iron block from the factory.
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03-04-2012, 04:18 PM
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#9
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Will Return
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Have you ever ported?
__________________
AC Dub Club
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03-04-2012, 04:20 PM
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#10
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cats cats cats
Join Date: Aug 2005
Location: VA
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Have you ever pooted?
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Four wheels move the body, two wheels move the soul.
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03-04-2012, 09:44 PM
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#11
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Resident Rocket Scientist
Join Date: Jun 2004
Location: Mass
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Quote:
Originally Posted by DerMaverick
fixed for you. |
Thanks.
Had just gotten up and my brain wasn't quite workin yet haha.
__________________
Originally posted by Blues Clues Opie:"Your constant grammatical and spelling errors do not bode positively in your direction against the forever looming power of ‘shens’."
ST:Almost Serious
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03-04-2012, 09:56 PM
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#12
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ahhhhhhhhhhhhhhhhhhhh
Join Date: May 2005
Location: *863*FL
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porting cast 327 heads off an 80s sbc is like polishing a turd.
__________________
just a slow n/a mustang
fastest 1/8 mile 6.10s @ 113mph 330ft 3.92s 60ft 1.36s
Snowbird Outlaw Nationals Winner 2012
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03-04-2012, 10:00 PM
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#13
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Kraft durch Freude
Join Date: Feb 2004
Location: UAE
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Quote:
Originally Posted by kfresh
porting cast 327 heads off an 80s sbc is like polishing a turd.
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Truth
I'd find a set of camel hump heads and be good to go. They're way cheaper and will do good enough. Throw a mild port and clean up the chambers and you'll be more then adequate.
Or just be done with it and go BBC. |
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03-05-2012, 07:22 AM
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#14
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$419$ FTW
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These are camel humps :-) the engine is out a 68 vette checked the numbers last night but still think I'm goin aluminum to save weight and I honestly like small blocks better because rev the piss out of them ha
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03-05-2012, 08:48 AM
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#15
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Kraft durch Freude
Join Date: Feb 2004
Location: UAE
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You can do the same with big blocks. Take a short stroke 396 or 427 and you'll have a great rod ratio and plenty of potential.
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03-05-2012, 09:19 AM
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#16
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$419$ FTW
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Yea agree on that only issue is findinga block in my area , everyone thinks their bare bones big blocks are worth 1000 or so which is crazy, I'm sticking small block for few more years atleast, then get some big block springs up front then go from their, waiting for winter to be over and ill post some pics
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