A-code versus C-code, what's the difference?.... - Vintage Mustang Forums
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Old 12-15-2002, 12:39 PM   #1 (permalink)
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After searching but having no luck, I've decide to ask. What exactly is the difference between a '65-'66 A-code engine and a C-code engine. I've been told its just the bigger carb. If this is true, would a C-code with aftermarket 4 barrel carb and intake be superior in performance to an original A-code?
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Old 12-15-2002, 12:42 PM   #2 (permalink)
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C code had dished pistons for a 9.3 to 1 compression ratio. A code had flat top pistons for 10 to 1. 4 barrel intake and Autolite 480 cfm 4 barrel carb on the A code.

If I recall correctly, everything else is identical.
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Old 12-15-2002, 12:49 PM   #3 (permalink)
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Thanks for the fast reply! I've heard of a HP difference between a 2V and a 4V carb but what kind of HP difference would the different pistons create if any?
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Old 12-15-2002, 01:25 PM   #4 (permalink)
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The C code was rated at 200hp
The A code was rated at 225hp

Higher compression always adds to the horsepower
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Old 12-15-2002, 01:28 PM   #5 (permalink)
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IIRC, the C-coder was rated at 200 HP and the A-coder at 225 HP....

Based on my observations with performance engines, that's a reasonable increase to expect from a carb/ C/R change. Manifold, although 4V, is somewhat limiting in design. An aftermarket aluminum manifold could add another 10 peak HP with the same carb.
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Old 12-16-2002, 08:31 PM   #6 (permalink)
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One other important distiction is this: The GT models in 65, 66 & 67 had at least A code 289's, No C code Gt's were built those years. But I bet a lot of C codes have been converted to GT's, whether the current owner want to admit it or not
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