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Author Topic: Are GT40 heads the same on Cobra's and Lightning's??? Jeff S ¯ Member # 371 posted                                 If not what are the differences? -------------------- '90 Mustang LX: 8.53 @ 157.92 w/ 1.33 60' on DR's '10 ZR1: FOR SALE '14 E63 S: RENNtech ECU '04 Gallardo: UGR TTG Posts: 2121 | From: San Jose, CA | Registered: Aug 2001  |  : JoeT ¯ Member # 298 posted                                 they are milled for the cobras, and obviously are for 1/2" headstuds but we had a good debate on that not too long ago so maybe we don't have to revisit that something like 64cc for the lightnings, and 62cc for the cobras or thereabouts -------------------- 1984 Ford Tempo AOD--- RIP Posts: 6785 | From: San Jose | Registered: Jun 2001  |  : 66 AC COBRA Nitrous King Member # 904 posted                              i had a set of gt40 lightning heads, the combustion chambers were polished, but no material was removed, the chambers ended up being 67cc, so i would guess 66cc is stock -------------------- FFR AC Cobra 72 Vega - WCHRA Extreme 10.5 Posts: 6280 | From: Winters | Registered: Feb 2002  |  :

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