Thread: 69' amx
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Old 06-25-2010, 09:51 AM   #17
Paul Ceasrine
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Default Re: 69' amx

I think I got it.
1969 AMX S/S cars. Engines with 390 Cross-Ram.
69' heads, modified by Crane, ported out, with Mopar 440 valves.
Combustion chamber (49 cc) hogged out to (57 cc) to reduce valve schrouding.
Cars were running in SS/D for 70', versus the Street Hemi cars
(primary competition).
Kaplan Engineering discovers more flow and 25+ HP at higher RPM's in the new 70' dog-leg ("L"-shaped exhaust port heads). Approximate gain of 3/10's off the E.T.
AMC wants to utilize these heads on the 69' S/S cars as a replacement head. NHRA says "No Way'.
Since they are a 70' design, they can only be accepted on a 70' car.
AMC, not interested in building an additional 50+ 70' AMX S/S cars
Decide to produce 70' up-grade kits for the 69' AMX cars. Front grille, fender extensions, light hardware and dashboard. With the 70' conversion, the newer 70' Crane 'dog-leg' heads can be used, to help
dominate SS/D.
NHRA gets wind of this, and says 'no way'. The 70' car is actually longer than the 69' car, and is not the same car The 70' heads cannot be utilized on the 69' car for Super/Stock, but Modified Production would be fine.
AMC was not about to spend another $250,000 building 50+ 70' AMX Super/Stockers.
PC
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