Much better choice.

Let me assure you, just because the standard ARP's have become the catch phrase answer on forums doesn't mean they don't turn into peanut butter around 500hp. Detonate the motor a little and watch them turn to goo.

What you get away with is in your tune. JAM may have no problems on their eleventy billion $ engines due to the specs they run. But the average drop in stocker motor with big boost and maybe not the most perfect tune in the universe will kill a set of ARP's like lightning.

Ask some DSM guys who are running big boost and see how many have been running A1's because standard ARP's hold so good.


You made the right choice.

 

ARP.......

 

Your reply here shows your lack of experience and speaks wonders for your credibility

The issue is not the studs stretching, it's that the head is lifting, warping and twisting under the detonation forces. NO stud will stop that! Tune the car, get rid of the detonation, install the studs properly and use the right gasket and you wont have any problems. When you drop in your "Stocker" motor and turn up the boost you're asking for trouble.

And yes, you're right. The "specs we run" do have an affect on head sealing issues. We deck the blocks with the right surface finish so that the gaskets seal properly. We don't have problems with gaskets sealing. The factory surface finish on an EVO block is too rough for a Cometic to seal properly. It may work for a while but when you turn up the boost and ask the Cometic to do it's job it will fail prematurely.

Second, double check our pricing. I'm sure you'll see that our builds are very competitively priced

 

If what you say is true then why the huge upheaval about L19 this year. I've watched countless people lift even O-ringed heads on built motors, that weren't knocking with ARP's. I'm sure you surface to a finish acceptable for the hg manufacturer. I didn't say your engines were bad.

But so do other machine shops.

Again, if ARP's were always fine. Why have DSM guys drilled and tapped for the 1/2in studs for years?

Why will noone admit to the standard ARP's being a problem?

Even if you aren't knocking, there are still plenty of ways to get cylinder pressures high enough to stretch standard ARP's. An aggressive timing curve on race gas, and alot of boost is one. I know I'm not you, but I've seen far too many failures to fall for the "its all user error" line. E-bash my credablility because it contradicts your post. Fine. It doesn't change the fact that they are still a problem.

No motor will always be free of small irregularities and unforseeable situations that could compromise your tune. In the case of the standard ARP's this is usually all it takes.

That is what I'm saying. The margin for error on a standard ARP stud, even with all the right work backing it up. Doesn't take but a small blip of knock to yank the head off enough to game over your hg. Even if its not in the tune, a small bit of loading coming off the sb. Carrying over into the launch. This kind of stuff happens. And the ARP's just don't hold. I'm not imagining this...
Its not my goal to pick a pissing match with you either.

I'm just saying they are not sufficient in most cases, and to opt for the somewhat stronger stud is a very good choice in most cases. Especially since it is now available for alot less than the A1's.