GMC5.3

iTrader: (2)

on the back of the cylinder head where the banjo bolt goes, what size thread chaser do i need to clean up the threads. thanks

GMC5.3

iTrader: (2)

1/4 npt

shbox

No, the threads are not tapered. That's the T in NPT.

Actually 1/4-18 NPSF. It is a special straight pipe thread.

GMC5.3

iTrader: (2)

SHBOX i really dont know what i would do without you, if you have a chance and i know im pushing it with you, but can you check my thread on Camaroz28 under the LT1 section and see if you have a solution to my problem. thank you sir