Main tunnel issues on LS2
Thread Starter
Teching In
Joined: Nov 2017
Posts: 2
Likes: 0
Main tunnel issues on LS2 I've just had a customers block line honed with ARP main stud kit on an LS2. It seems that every time I remove the cap the clearance changes and seem to get some out of round yet it measured reasonable when i picked up the block and measured before I removed the caps to fit bearings. I noticed that ARP has a torquing sequence when torquing up the studs. I'm not sure if the machine shop done it the way ARP recommended or whether they torqued the studs up just like the early SBC from cap to cap. Has anyone else had this issue? I also noticed that on one cap I forgot to tighten up the 6mm side bolt to 20LBS and when I did, I got another .0003" to .0004" extra. These blocks seem to move around a lot or have I some other issue?
ARP suggests torquing and loosening and re-torquing three times in order to create re-peatability
The local shop to me would always muriatic acid dip the threads to remove that black oxide coating crap
Use the ARP moly lube on the threads but EPL (extreme pressure lubricant) on the washer surfaces
This creates re-peatability without using up fastener stretches
Also; I always pull them up in three equal increases....EX; 50,60,70 etc.
Then lastly do the side bolts
The local shop to me would always muriatic acid dip the threads to remove that black oxide coating crap
Use the ARP moly lube on the threads but EPL (extreme pressure lubricant) on the washer surfaces
This creates re-peatability without using up fastener stretches
Also; I always pull them up in three equal increases....EX; 50,60,70 etc.
Then lastly do the side bolts
I've just had a customers block line honed with ARP main stud kit on an LS2. It seems that every time I remove the cap the clearance changes and seem to get some out of round yet it measured reasonable when i picked up the block and measured before I removed the caps to fit bearings. I noticed that ARP has a torquing sequence when torquing up the studs. I'm not sure if the machine shop done it the way ARP recommended or whether they torqued the studs up just like the early SBC from cap to cap. Has anyone else had this issue? I also noticed that on one cap I forgot to tighten up the 6mm side bolt to 20LBS and when I did, I got another .0003" to .0004" extra. These blocks seem to move around a lot or have I some other issue?
