[mikebaronehouston]

Good evening.

I was moving along putting together an engine when the suitability of a Butler Ram Air IV roller cam was raised. I am looking thoughts/experience and appreciate your feedback.

'68 428 going into a '68 bird. M-20 and I am thinking a 3.23 posi. 70-72 400-455 intake or a Performer RPM.

Heads are early #16(screw in studs) which I believe are 72 CC. Going to get pistons made with 22 CC dishes to achieve 9.5 compression for street car with pump gas.

I would like to run high :12s or low :13s. Faster is always better, but I would also like to be freeway able.

I am about to pull the trigger on a Butler RA IV roller kit (lifters, chain, etc.), but a question cam up on the suitability of the cam for a 9.5 compression engine. 428 were 10.5 or 10.75 in the day. Butler stocks 10.5 pistons.

So two questions:

How will a 9.5 compression impact a RAIV grind performance? Will the cam perform like it should? Will I be happy? Lots of subjective there...

If a RAIV grind is not a good fit, what roller cam would have a similar sound/idle? RAIII a better choice? Or the CompCams middle grind? 224 228. Although I think the 110 LSA is a bit low.

I am not super technical, so subjective thoughts appreciated.

Mike
Houston, TX