Thread: New Head Gaskets

...Excite!

20170106_103019.jpg

Originally Posted by garrycol

Oh - when I got my studs the instructions said to torque to 100 ft lbs which in my view was too high. Here is a link to the current instructions - have been reduced to 70ft lbs so maybe they did have a problem.
http://arpinstructions.com/instructions/157-4301.pdf

Garry

Originally Posted by ozscott

The recommended tension for this kit in the instructions is 100 pounds

Double check that it is 100 pounds or 70 pounds

Here is the link to ARP Website with the kit you bought
The Official ARP Web Site | Kits

If you click on the instructions link you get the instructions which are dated REV 1 DEC 2016 (see bottom of page)
[ame]http://arpinstructions.com/instructions/157-4301.pdf[/ame]

This doc says:

TORQUE PROCEDURE
9.
Following the manufacturers recommended torque sequence, shown below, torque the nuts per steps 1-4
1- Tighten nuts 1 through 10 to 25 ft-lbs
2- Tighten nuts 1 through 10 to 50 ft-lbs
3- Tighten nuts 1 through 10 to 70 ft-lbs

So it goes up to 70 pounds with step 3 but the pdf instructions says there are 4 steps so is the last step to 100 pounds? -

The paper instructions with the stud kit says 100 pounds but have they changed it since the kit has been sitting on the sellers shelf - confusing.

When I did mine I went to the 100 pounds and one stud pulled out of the head at about 90 pounds and I had to get the hole repaired - use a long nut-sert not a helicoil and there are not enough threads on a helicoil to hold - the cast aluminium in the head fails. Look how long the threads are on the stud versus the number of threads on a helicoil.

My engine builder said 70 pounds was OK for a RV8 and I went to about 75 (or was it 80) and that was the advice on a number of forums.

So you need to make up your own mind - I emailed ARP and whether 100 was too high and they did not respond.

Garry