New Problem

[Ty 1885]

Hey, after 3 runs at track (TY was off for 5min) lifters on pass side started to make loud noice once it started. This happed once , i thought maybe it got hot, and a lifter lost its prime.

Yesteday i pulled pass valve cover. One of the rocker studs turned at only 30 pounds with torque whench.( must have over tighted that rocker before)

Because i run roler rockers with ARP metric studs, i had to put ARP washers under the studs in order to have more treads for polylocks. One of the studs pulled some of the treads out of the head. In order to FIX this i had to REMOVE the washers on that stud.
Now i have 4-5 treads to hold the polylock. It should be fine with the single springs, right ???


Thanks..

 

[bezerk]

Re: New Problem

why not get a new stud, only $6 a piece or so. i woulnd't risk loosing one.

 

[jharrison]

Re: New Problem

General rule of thumb is to have at least the diameter of the stud or bolt worth of thread engagement. If you have at least that you should be good.

 

[Ty 1885]

Re: New Problem

why not get a new stud, only $6 a piece or so. i woulnd't risk loosing one.

The stud it self is not the problem. ARP does not make longer metric studs.
IF you do not cut the heads for SAE studs (longer) than you have to use ARP metric studs that are a bit short when running roler rockers. That is why i put washers under the studs, to bring them up a bit. That way i would have more treads for polylocks.

 

[STORM TROOPER]

Re: New Problem

what was your 1/4 time and mph? Im not a macinest but I would be worried about that maybe helicoil?

 

[V6 Kompressor]

Re: New Problem

I took the 10mm holes in the heads and drilled/tapped them out to 7/16 nc and used small block 7/16 X 3/8 studs. they torqued great and give me the stud length needed for crane rockers. If you don't wan't to do that and still want to use the metrics, i would use lock-tite red on the threads in the heads... damn, rhyme anytime for a ??