Hey, this is briefly discussed at Mustang Works, Articals/Powertrain/Cylinder Head Science.
"Alum. Vs. Cast Iron
Given a 9:1 or 10:1 compression ratio
(static) an Iron Cylinder will make more
horsepower than an Aluminum head, due
to the fact that it retains heat
(power/energy) more efficiently. However,
Aluminum is lighter, easier to work with
(and cheaper to produce), and more easily
repaired. In addition, Aluminum is more
resistant to detonation under high
compression, nitrous or boost situations."
http://www.mustangworks.com/articles...adScience.html
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'79 Mustang Coup
4" Cowl
Weld wheels (15x6;15x8)
Stock 5.8L
C4 w/ shift kit
1.5" MAC full length headers
Holley 750 CFM
Edelbrock intake
2.5" Off road H-pipe, 2-chamber Flowmasters
8.8" Rear end w/ 3.55 gears (Now that's more like it!!)
Front: 225/60/15 Rear: 255/60/15 Eagle GT II
14 x 4” K&N air filter (getting the Xtreme setup soon)
"Red, thou art my companion. Hasten now your quickened metamorphosis to Green that I may conquer all
who dare abide there beside me. May they be left thither behind burnt black." ---Fox Body