Looking to replace Mopar Purple grind P4120663 cam. (312 dir .590 lift) in 451 B-block stroker motor. After replacing 452 steel heads (Open 81cc) with B1 (Closed 68cc) Guess what happened? Mopar cam and lifter damage. B1 springs (Comp 928) Seat load: 160@1.880", Open load: 383@1.250" are designed for .590 to .650 lift cam. My tired Mopar .590 lift cam ground a couple lifters.
I am looking for replacement. A roller option is not out of the question but a stronger Mech/solid Flat tap would due.
My primary concern is that I am using stock forged 383/400 rods and was told .590 lift is about as high as you should go due to clearance issues. (Though it appears a higher lift would work.)
All open thoughts are welcomed.
I am looking for replacement. A roller option is not out of the question but a stronger Mech/solid Flat tap would due.
My primary concern is that I am using stock forged 383/400 rods and was told .590 lift is about as high as you should go due to clearance issues. (Though it appears a higher lift would work.)
All open thoughts are welcomed.
