Thread: 572/620 hp How high can it rev

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your 572/620 would have to be recam with a solid cam to find more rpm .but GM put the crat engines together with some parts that i would not use for hi rpm and i would take the engine apart and check all size things need to be dead on were they may not be so /so .i used alot of rods your engine has .the crank block will take hi rpm. things do not need to be coated that only slows things from welding .together.. if things are not right it is not going to help much from what i seen i used coatings on some parts my feelings on some of this stuff is mixed .i can show you cranks and bearings out of 8000 rpm500+cid engines on spray that look very good . like use them again good.. .oil is the big deal were it is going .and how good the oil is .the valve train will stop you from going were you want in rpm s the hyd lifters are very heavy so big springs can help .there is now a howards pro max hyd roller lifters that can go past 7000 rpm and will take the seat lbs 225and 575 open max some have used rev kits to help keep the lifters on the hyd cam .so a custom hyd roller and you could push past 6000.but i would look over your valve train well . i build a far amount of bbc .THE LINE OF COULD AND SHOULD that line seam s to be very thin .street hyd rollers are fine . if you are keeping the rpms low the hyd roller can do a good job .for guys that tell me if its still going to pull i am going to take it there.. well they get solid rollers.. you need to keep up on the valve train . i use hyd rollers for the street. for mud and drag cars and rev heads solid cam engines .alot of were things go south fast is the upper end