Jay, i have just fitted my cast 428cj intake manfold on to my 69 428cj engine, it had a performer 390 alloy intake on the engine when i bought the car, what horsepower increase would i see, 428cj engine, 10.5 comp, 235int -244ex @.050" , .535" lift , 110 l/c hydraulic cam, 735 cfm holley vac sec, headers 4 into 1
thanks Idi
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