I think it will be ok Tech. They are a very large chamber head with a centrally located spark plug. I'm not a "drive it everywhere" kind of guy anyway, so the best premium at the pump with a bit of octane booster is allright with me. I may chicken out and put the pistons in th piston vice and spend some time on the mill massaging the tops a bit. I'm building the car light, so there won't be a lot of mass to get moving. One of the things I've learned on the Nailhead allready is that you don't have a lot of selection on which "good" parts you use. These are the best pistons I've come up with and not have to go to the 200 apiece custom built route.

The stock bore is 4.312 and stroke is 3.640, should build huge torque without having to put a lot of timing at it. My biggest concern is to get the cam specs to work in the motor and compliment the hi torque at low RPM charachteristics of the motor. Stock it built 465 foot pounds of torque and 360 horse and had it all in by 4500 RPM, so if I can cam it to improve the torque number, it should fly.