Thread: GT40 aluminum heads
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Old 12-06-2007, 07:53 AM
Goober Goober is offline
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Join Date: Nov 2003
Location: Houston, TX
Cobra Make, Engine: Superformance #1374 with 392 RDI Stroker
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Some solid info on changing GT-40X heads for AFR 205's. A friend of mine here in Houston was running a FMS 392 with advertised 430HP. This was the older engine that had the cast pistons. The motor dynoed @ 436HP out of the crate. The head change with no other modifications (left the original cam) made 497HP before any tuning took place. I don't know if he got more HP after fine tuning or not, but I'm sure he picked up a few more HP

Hope this helps

Mark
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