Does anyone have any experience with the ProMaxx big block heads? I bought a set for what I thought was a great deal. They were used on a dyno mule while the guy was testing cam and intake combos... For $700 it was hard to turn down. I'm just looking for some feed back on these before I bolt them to my 440. Is it worth investing any money on porting?

Thanks

Last edited by MrMayhem; 03/17/19 09:32 PM.