88GTBLACK

im concerned...in theory if all slugs didnt have exact material removed off the tops of the pistons perfectly wont it throw off engine balance??? im thinking theory here, and have seen peoples actual dremel work that didnt look so hot while others take theirs to a machine shop, while others pull the pistons out and get them cut. what do you guys recommend and why

AdderMk2

its always best to do it right

but why flycut stock pistons, then pay to balance them. Buy new forged pistons and get those balanced.

fwiw, TRW pistons may be forged, but they are the lower end...

Mark O'Neal

You are not likely to change the weight enough to effect the balance.......the problem is the aluminum shavings you are likely to leave in your engine.

It's best to pull them.

88GTBLACK

thats what i figured would flycutting stock pistons throw off the balance of rotating assembly if i dont pull them out?

93hatch306

if machining prices are as bad everywhere else as they are here, it'll be cheaper to just buy new pistons. if you want to use the old ones, pull 'em out. the one metal shaving that doesn't get cleaned out of the bores will haunt you later.

Mark O'Neal

No. I doubt you'd take a gram off.

Shelty

my buddy did to his, he had a fresh bottom end, n when he flycut his, him n his dad put clay around the valve reliefs n did their work.

he had a set of AFR 185 heads, n was gonna build his bottom end until he found out it was a fresher rebuild.

Jfsram

It's way too much work to strip the engine down to the short block in the car to do a half assed job of flycutting in the car.

For the labour involved, just yank the engine and do it properly.

88GTBLACK

great info man and everyone else just what i want to hear. Looks like i'm going to do it right and pull the slugs ill talk to the machine shop maybe ill punch it out to a 306 we'll see what everything looks like when i strip it down. Thanks guys