Well the F7 Seized up again for like the 3rd time in like 2 years. Ive put in a brand new crank and titanium rods. basically everything on this sled is brand new besides the hood and the seat. Last year the bulkhead cranked so put on a new one new oil pump,and gauges out the waazooo to try to keep thing girl cool. this will prolly be my last engine till i sell it iv'e spent wayy to much. Js cant cant get the heart to give up on her. But js wondering what are some good piston brands. Ive tried wiesco twice and arctic cat pistons once. nothing against these products but just want a different brand any opinions. And also for big bore kits is it worth the upgrade or not thx.