melzieann

Hi,
my mate has a sapphire cossie 4x4 and is using ARP head stud and nut kit instead of normal head bolts does any 1 know if theses are re-useable or not

thanx
Simon

Butch.

iTrader: (1)

yes mate they are reuseable as many times as you want

melzieann

CheeRS

JjCoDeX75

Not quite true - they can be reused lots, but you need to occassionally check the studs for stretch.

All bolts stretch on this sort of pressure. the ARP site I think provides stretch gauges to see how much they have stretched over time. When they get past a certain point, I believe they should then be renewed.

It is all related to their elastic strength (I think!)

That said, I am on the fifth time with mine, and no worries so far

JJ

Big Will_

Well said mate - you're absolutely right.

Should check for stretch each time you reuse and replace when out of tolerance

col cos1

iTrader: (5)

i got arp head bolts with my car when i bought it but was advised against useing them by alot of people cause they supposidly crack the head

melzieann

that dont sound good

JjCoDeX75

I have had no such experience, and cant understand why this would be the case, providing the instructions are followed properly

JJ

tabetha

No stud is going to cause a crack in the head, especially when it is the same size as the one that comes out!!
They have probably got stories like this jackanory one because most stud kits are fitted to UPGRADED anyway, and 2wd have been known to crack around head bolts if stud or bolts are used anyway.
The engine(2wd)never designed for this amount of power, and is only a tranny engine in disguise!!
Why did they change things ?, because of problems.
tabetha

JTECH James

iTrader: (13)

its the block that can crack, through the bolt holes ,


the studs dont give like normall bolts do, and at high boost they can crack, thats why long studding is the better option.

but saying that i use the arp kit at 32 psi and have never had an issue

tracktoy

has anyone had problems with the arp kit - i had them on the 500 and never had a problem

heard lots of people say they are no good but dont know anyone who's had a problem with them

JjCoDeX75

32 psi and no probs!!!

JJ

Butch.

iTrader: (1)

i used them on 2 engines one at 32 psi and 1 at 34 psi and both were fine

tabetha

Peicher & Voln used them on a 48psi engine for over 150,00(km's) without problem.
tabetha