Re: Mark 4 454 with roller cam,what front cover ?
I also run the step nose cam with plate. One thing I want to point out is to be sure to check your end play. When I first checked mine it actually had preload (no end play). I had to surface grind about .005 off the plate to get a couple thousands end play. I don't imagine the needle bearing thrust would last long with preload on it.
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10 to 4 comp.
Brodix Race Rite BB-2 Plus heads
Edelbrock RPM Air Gap
Quick Fuel 950 CFM Carb
Lunati Voodoo HR 231/239 @ .050, 600/600, 110 LSA
Johnson 2116 BBR lifters
Hooker Super Comp 2" primary headers
Tremec TKO 600 .82 overdrive