you can put mild threadlock on em. just take em out one by one that way you don't move the butterfly then your throttle binds up n stuff.

just be careful, even easier you could put a dab of silicon on the back.

the main problem i found with the qr25's is the damn balance shaft assembly.

i made 305hp @ 8 or 10psi i forget, which is pretty much double what they make stock, ends up ripping the teeth off of the balance shaft assembly and the teeth clog up the oil strainer making low oil pressure resulting in rod knock.

worst part about it was he had the jwt balance shaft delete kit the whole time but just didn't have it installed. i later installed it when i fully built his motor with custom rods and all.

hope that helps,

Dave