Any diffrence on the borading ? Hp ? Torque?

Also if you run a cam around .443 would it be best to run the dual valve springs ?
Thanks

 

"Boring" your engine does increase displacement which does increase HP a very negligible amount. But its actually to restore your cylinders to roundness and a nice surface for rings to seal. As far as cams and springs. You want your springs stiff enough to close the valve as quickly as the cam lobe will allow at your maximum rpm. As lift and or duration increases the "steepness of the cam profile increases also. This means that if your springs are not stuff enough they will "float". This can cause all sorts of problems that can make your day not so fun.

 

Bore only enough to get the cylinders round .

Material left to bore again in 1/2 million miles

Big Cam strong new springs to make sure the valves follow the cam