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Old 03-04-2012, 08:38 AM #1
shootingdahfool79
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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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Old 03-04-2012, 10:00 AM #2
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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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Old 03-04-2012, 10:09 AM #3
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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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Old 03-04-2012, 02:03 PM #4
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Quote:
Originally Posted by DRock View Post
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.
fixed for you.
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Old 03-04-2012, 02:30 PM #5
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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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Old 03-04-2012, 03:34 PM #6
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Ceramic is the way to go .
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Old 03-04-2012, 04:20 PM #7
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Aluminum Heads
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Old 03-04-2012, 04:32 PM #8
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I have aluminum heads on an iron block from the factory.
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Old 03-04-2012, 05:18 PM #9
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Have you ever ported?
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Old 03-04-2012, 05:20 PM #10
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Old 03-04-2012, 10:44 PM #11
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Quote:
Originally Posted by DerMaverick View Post
fixed for you.
Thanks.

Had just gotten up and my brain wasn't quite workin yet haha.

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Old 03-04-2012, 10:56 PM #12
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porting cast 327 heads off an 80s sbc is like polishing a turd.
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Old 03-04-2012, 11:00 PM #13
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Quote:
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porting cast 327 heads off an 80s sbc is like polishing a turd.
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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Old 03-05-2012, 08:22 AM #14
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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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Old 03-05-2012, 09:48 AM #15
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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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Old 03-05-2012, 10:19 AM #16
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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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