318: What Will It Make?

That's quite a close shave. Don't forget to correct pushrod length. It may affect geometry a bit, too, so I'd blueprint it a little, before buttoning it up. Watch for pushrod clearance on the head, too.

What do the chambers look like, now? If they've got a closed end on them, you may want to run the FelPro .039s to get some quench and keep your 10.7 on premium.

There are a few high compression 360s up here, running KB pistons that do fine on mid grade. One of them belongs to Khalid. You can get away with a lot more up here on 10.7:1 and you will notice more HP for the return by keeping it that way.

If you've got a closed chamber, use it. Keep the quench and the .039 gaskets. You won't have to worry about ping up here on premium with that comp ratio. You're gonna lose a little bit with ring height cc and total, actual CC as well as other dynamics, aside from altitude.

Depending on the LSA of the cam, the ramp and open/ closing degrees, you can also try to play around with the cam to mess with total cylinder PSI. You might benefit from buying an adjustable cam timing gear to play with it. but I'd start at 3° adv.