Shaving Heads 94 Phazer

I have a 94 Phazer ST. 136 1.25. I have a DG pipe, 36 mm flat slides, Uni air pods , Boyseen reeds , new style secondary. Sleds works well. Wanting a little more. Can the heads be shaved a few thou to up the compression? How much clearance? Ride at 1500 ft. Okay with mixing a little lead.

tried to replay to your pm but your inbox is full ...... yes you can cut the heads but really good fuel will have to be used i would personally leave them stock unless engine work is done, with a pipe alone 93 is required to be safe

Thanks for the reply and tip about my inbox