solid flat tappet VS hydraulic roller
Posted: Fri May 13, 2011 11:33 am
I'm having a dilemna that I just can seem to sort out. Lets say a guy is wanting to build a plain jane sbc 350 that can rev to 7,000-7,500 and make about 550hp.
Around the usual street specs, 10:1 compression, RPM AirGap or Super vic intake, 195-220cc heads, 950cfm carb, a well sorted out HEI type ignition.
Cylinder heads are running stainless valves and good but not really expensive valve springs (say any that sell for less than $150 a set).
roller rockers, thickwalled 5/16" pushrods or 3/8" pushrods, no rev kit.
And here's the question-
Would you prefer to run a solid flat tappet cam with face oiling lifters or a hydraulic roller cam with stock lifters (cost is about the same for either scenario), we'll even say you can shim the lifter internals to limit travel to .015" but you have to use the stock dogbone/spider setup. Oh, and stock cam core size stock lifter diameter.
I'm thinking the solid flat tappet would have an advantage here because of the weight, but perhaps I am wrong?
Around the usual street specs, 10:1 compression, RPM AirGap or Super vic intake, 195-220cc heads, 950cfm carb, a well sorted out HEI type ignition.
Cylinder heads are running stainless valves and good but not really expensive valve springs (say any that sell for less than $150 a set).
roller rockers, thickwalled 5/16" pushrods or 3/8" pushrods, no rev kit.
And here's the question-
Would you prefer to run a solid flat tappet cam with face oiling lifters or a hydraulic roller cam with stock lifters (cost is about the same for either scenario), we'll even say you can shim the lifter internals to limit travel to .015" but you have to use the stock dogbone/spider setup. Oh, and stock cam core size stock lifter diameter.
I'm thinking the solid flat tappet would have an advantage here because of the weight, but perhaps I am wrong?