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4ac Head On A 2a

Featured Replies

will a 4ac head fit a 2a motor

it will physically bolt on and all the accessories like the timing belt and all that should also be a straight fit as well. However there will be a compression ration change, almost definately upwards

  • Author

ok sweet thanks for the help does anyone know if it will run good or will the compression ratio be to hi

Edited by madmax7

you will likely find due to their low cost the easist option would be to just source a 4ac engine and drop it in. Might even be cheaper than a gasket set

Get the whole 4AC. The 2A has a shorter stroke, so the combustion volume will be smaller than a 4A to compensate the compression drop when you reduce the volume of air the motor pumps per revolution. This rule of thumb is pretty standard across most motors. Gemini owners do a 1600 head on the 1.8 or 2L G motors to up the compression with a cam. 202 with a 186 head, 2.7 bmw 6 with a 2.3 head, are some other examples.

 

As Sam said, get the whole thing, bolt her in and your away.

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