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10-18-2002, 08:24 PM
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CC Member
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Join Date: Jul 2000
Location: Lake Orion, Michigan,
Posts: 23
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Not Ranked
Cylinder Heads?
What are the benifits of Aluminum heads over Cast Irion one's That would justify the price differance? Rebuilding my engine and thinking about going with aluminum!
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http://66cobra.0catch.com
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10-18-2002, 08:35 PM
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Senior Club Cobra Member
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Join Date: Mar 2002
Location: God's country,
ME
Cobra Make, Engine: Original ERA 427sc, Powered by Gessford
Posts: 2,678
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Not Ranked
The two advantages that have made me decide to go with aluminum are weight savings and better heat dissipation which means that you can effectively run a slightly higher compression ratio than you could with cast iron head without the risk of detonation. Not to mention that you average modern aluminum cylinder head will have a better design and flow much better than a factory cast iron head.
Anyone else?
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Replica is not a dirty word.
"If you can't be a good example, then you'll just have to be a horrible warning."
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10-18-2002, 08:42 PM
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Senior Club Cobra Member
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Join Date: Jul 2002
Cobra Make, Engine:
Posts: 15,712
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Chaplin,,,,,,
You nailed it!
Ernie
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10-18-2002, 11:14 PM
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CC Member
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Join Date: Mar 1999
Location: Pace, Florida, U.S.A.,
FL
Cobra Make, Engine: Hunter 427, 5.0 (302)
Posts: 966
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Not Ranked
Aluminum heads are as mentioned lighter, usually better designs and yes you can run about 1/2 point more compression.
Iron heads are heavier, less expensive, and retain compustion heat which may offset the higher compression on the aluminum heads.
One thing with Aluminum heads is due to better heat transfer they can overtax you cooling system. If your radiator is marginal with Iron heads Aluminum heads may transfer enough heat to boil over.
There are a few good Iron Heads out there like the World Products, GT-40 and GT-40p's.
I am tunning the GT-40p heads and I like them
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10-19-2002, 12:18 PM
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CC Member
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Join Date: Jun 2001
Location: Washington DC Metro (Virginia),
VA
Cobra Make, Engine: Classic Roadsters, Tweaked 351W, T-5Z, CRII Tech Support Team.
Posts: 1,895
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Not Ranked
Dinky little valves, and dinky little ports on smallblock Windsor Fords have been a problem since they first rolled off the assembly line. The aluminum aftermarket heads let the motor breathe with better ports and bigger valves. And they're a lot lighter.
There are also some good iron aftermarket heads from World Products, and Jack Roush with the 2.02/1.60 valves and good port designs.
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