you want to make a fast 372 with minimal risk? order a non windowed husqvarna 268 piston and get a machine shop to cut a pop up on the top. you will have to figure how much needs cut to get the proper squish clearance as just cutting off the difference in piston height will result in loose squish like all 372's have. once the clearance is correct, assemble, and go cut wood. i would advise you to keep your grinder away from that cylinder until you have a better understanding of porting. stock 372 is like 101/124/78 or something like that and with that piston cut with a pop up you get a compression increase with an acceptable squish clearence and an intake of 88 or so. compression ends up 180-190 psi if you get it right and you can use an OEM base gasket. it's alot of intake duration but it doesn't seem to hurt them at all and no spit back. just DO NOT lower the intake anymore if you port it. i've built 4 that way but without the popup and they will run with any other ported 372 even before any actual porting. 3 of the ones i built were done with farmertec pistons @ $3 each lol chamber cutting way is trickier cause you got to degree the cylinder and bring everything back up which is a bit more involved then some should get. this is the easiest way for a guy to get a fast 372 that can compete with the rest and is entirely reversable if you do the popup way. this will likely get you more gains then any porting you do if you don't understand porting to begin with.
