ARP standard vs. OEM 6 bolt

[CarPsyco84]

OK, heres the build up, I'm running a SCM61 on a 6bolt. Since I like to push things, and don't have to rely on this car for transportation I sometimes run upwards of 35psi of boost. The engine has ARP standard head studs with a MLS head gasket installed (by someone else, unknown how tight they torqued em). Guess my question is is there any proof that these are stronger/weaker than the OEM 6 bolt head bolts? Cause the car pushes coolant under power now. 3-5 pulls and it blew out 2 quarts of water out of the cooling system, causing it to run hot (surprise surprise).

[4g63tcrazy]

OEM 6 bolt headbolts are actually stronger then standard ARP's. There is a big thread on dsmtalk about it. I'll see if I can find it..

[blackrosenova400]

L19's plus FelPro Permatorque FTW!

[Goat Blower]

OEM 6 bolt headbolts are actually stronger then standard ARP's. There is a big thread on dsmtalk about it. I'll see if I can find it..

No frickin' way, I call BS on this one. After the headache I got last night looking a few things up on talk, I remembered why I haven't been on that board in years.

Headgaskets can still blow with ARP's, or any other stud for that matter. Too much detonation or bad surface prep is going to cause problems. In a lot of years and different engine combos, I've only run regular old ARP's and I've blown one headgasket. I've also reused them many times and reused the same MLS gasket when chaning the head with no problems.

If it were me, I'd pull the head, see what went wrong if anything, clean up the gasket and spray liberally with copper spray, clean and re-lube the ARP's and call it a day.

[4g63tcrazy]

It was something about the yeild point of which the ARP's will stretch and the stock headbolts had a higher yeild point. I'm having trouble trying to find the thread.

[Super Bleeder!!]

It was something about the yeild point of which the ARP's will stretch and the stock headbolts had a higher yeild point. I'm having trouble trying to find the thread.

Please find it.

[4g63tcrazy]

Found it! They start getting into more info on page 3, but I didnt read any farthur. Looks like more talk then actual facts. I read the thread when I was still a n00b so who knows..

http://www.dsmtalk.com/forums/showthread.php?t=182453&highlight=yield+strength&page=4

[Goat Blower]

Yeah, talk was all I saw looking for information on turbos the other night.

[Shane@DBPerformance]

Steve, you might want to check some posts on that other board that you are a moderator of from 5-6+ years ago about this subject. It has been know for quite a while that normal ARPs aren't all that good. The Supra guys figured out that their stockers were better than the ARPs ages ago.

Just about every DSM with normal ARPs starts pushing coolant in the 475-500awhp range on my dyno. It's like clockwork, doesn't matter how conservative the tune is. Evos heads are a bit meater than DSM heads and are less prone to flexing, so they aren't as prone to it.

[Goat Blower]

Hmm, I'll have to go back and look, I don't remember the topic offhand. BTW, I made 520awhp on your dyno without pushing, I must just be an awesome engine builder. :)