Thread: GT40 aluminum heads
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Old 12-06-2007, 06:38 PM
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Curt C. Curt C. is offline
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Oh I see, the first reference is from the second MM&FF Ultimate Cylinder Head Guide test using a 331. In this test, the GT40X showed average 315HP and 386TQ versus 343HP and 417TQ for the AFR 185 versus 339HP and 411TQ for the Z head. In addition to more cubic inches, this engine also sports a more aggressive cam - XE274HR versus the XE264HR for the 306 engine used in the first Ultimate guide test. Apples and Oranges.
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