Originally Posted by
Rick
I have seen numerous failures using the ARP bolts on the CVH. The std head bolts and gasket just don't fail. I have never seen a CVH turbo gasket fail that wasn't caused by overheating, detonation or some other abnormal condition.
Rick
What was the reason for the failures though Rick, do you know what had actually failed, had the gasket let go, was it not sealing because of inconsistent clamping force, etc..?
I'm trying to make a decision and learn based on actual technical information (rather than 'They are bad... end of!' lol
) so am very interested to know!
Originally Posted by
Canada1
Hi Rick,
The reason stretch bolts were introduced by mass manufacturers was to eliminate the
retorquing that was necessary with a non-stretch fastener and easier for automated engine assembly . Do you realise how a stretch bolt is designed to operate? It is made of a lower grade material - grade 8 or lower, and is torqued over the maximum yield point at which the fastener reaches a plastic stage. There is alot of published material on the subject.
Yeah thats right.
Originally Posted by
lurch1977
I have cometic head gasket and arp head bolts, amongst other mods (will post if required). I'm running just over the 200bhp mark and never had any issues.
For the record I torqued the bolts to 66psi and then another 90 degree turn
We are talking about ARP head studs/nuts not ARP head bolts mate, two different things.