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273 can go +.060. max, 040 is ok also. replace sleeve will work good.

hi, the carbs will work as both use same intake manifold. the difference is in the secondary jet. the 71 sec jets were shorter as the body had longer casting to put jet near the floor. the72 and up, has a longer sec jet, commanly refered to as a solid fuel type.the casting was shortened to make...