what is the reason for a 30 degree angle valve cut ? should i have this done on a Street performer 351 windsor with stock street heads and a mild cam?
It will seal off better when valves close, but unless your going to increase compresion ratio with different pistons it really will not do that much good.
it all depends on what kind of performance you want out of your engine. the more angle cuts on the valve makes a tighter seat on the head, which seals the valve better. The tighter the seal (more cuts on the valve) you don't lose fuel to blowbye through the valve seat. If the seat is real tight, the gas burns more complete which increases performance and HORSEPOWER~ But remember, that HORSEPOWER COSTS MONEY! Is this kind of modification worth its cost? On a mild street 351 small block, this would be money not necessary. Add a NOS system instead, maybe headers and a crossover pipe, beef up the trans and rearend. Use your money in better places. If you have extra money. this valve cutting won't hurt it. It will improve its performance because a tighter seal doesn't allow blowbye through the valve. You can even go with 5 angle valve cuts if you want an even tighter seal. I believe in Cheaters points - - NOS. When used properly, you'll enjoy the extra HP it will give you instead!
Makes the intake and exhaust flow smoother.
