I have 11 mm ARP studs, would those not have enough thread area to not strip out the block?
If you don’t torque the bejesus out of it it won’t stress the threads as much and you’ll still have more clamp load than 10’s. Like 80 or 90 ft lbs
I got the head off today. Holy f@ck what a tedious jigsaw puzzle that is with the Steed 2.0 and EFR 9180. The Steed 1.0 is the clear winner when it comes to pulling the head off.
The head gasket does not show any signs of failure from the quick look I’ve had so far. The block is cracked from most of the stud holes to the adjacent coolant passages. That’s a bit of a kick in the junk but I was half expecting it.
Going to shell out for CA625+ ARP studs from VAC instead of 11mm again?
I have an old set of the 10 mm ARP 2000’s laying around that I could use if I don’t reuse the 11 mm L19 studs again.
Something to note about the L19 studs. People have said that they are sensitive to corrosion but mine have been in there for 4+ years and still look like new.
I think the issue with L19 is hydrogen embrittlement, not actual rusting. I don’t know much about it though. This is the 2nd case I’ve seen of a block cracking spontaneously when using 11mm L19’s. What were they torqued too?
Might be interested in the L19 for my Euro S50B32 build before I just order new 2000 or L19.
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Mine cracked in the same spots using 11mm headstuds. This is the reason Im back at 10mm ARP2000s. When searching for a solution, I reached out the ARP to make the 625 custom age 10mm headstuds. Not running them yet, Ill wait til there is a problem.
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Were you using 2000's or L19's? What torque?
It would be interesting if we could figure out a trend of why some crack and some don't. Me and Dmitry were just discussing this and I don't know how to make sense of it. He runs 12mm's, I run 11's. Lots of people used to run 1/2". A bunch of other people run 11's. Some crack and some don't and it doesn't seam to be directly related to power output or use.
I know your Anthony cracked, now chickinhed's, and dmitry said that Avee had two blocks crack. I know Donnovan Marvin had one crack with 11's but it was during a catastrophic engine failure. Mike R ran 11's for awhile but I don't know if he stopped because of cracking.
The blocks also crack in places other than the head bolt holes. I've seen them crack between cylinders and also down the side of the cylinder through the side of the block. The 87mm bores I think are much more prone to this. I also wonder if perhaps there is a problem with the casting of certain blocks.
Last edited by someguy2800; 10-15-2018 at 10:32 AM.
My block looked the same as Brads, s50 with 10mm arp 2000's. I had 5 stud holes with cracks.
-sold...replaced by turbo e36
I bought the CA625+ head bolt kit since there seemed to be a lot of cracking issues with drilling the block for 11mm.
The cracks in the block look old, it’s hard to tell with the head cracks.
Has your block ever overheated?
-sold...replaced by turbo e36
You guys do realize that torquing an ARP stud with fine threads to 95 pounds is about the equivalent of torquing a headbolt to about 120 pounds? That puts a lot of stress on the block! Then you add combustion forces on top of that.
Marty
Is one of the cylinders steamed cleaned more then the other? It just appears that spark plug has some heavy carbon buildup for what should have some steam cleaning effects due to coolant leakage.
WOT
The 11 mm studs with the higher torque happened in response to a blown head gasket...... or two...... in hopes of it not popping as easy. Unfortunately then the block cracks and the head cracks. The stock head gasket and o-rings work very well when clamped that tight.
In the blocks 250,000 mile life it has experienced water pump failures, rad hose failures, heater hose failures, over boosting, detonation, many track days and sitting in traffic. There are a few ‘incidents’ ,trying to gain boost control, over the last year that I can think of that probably put more stress on the head stud holes then they should have.
I picked up a head and dropped it of with my head guy. The new used head will get pressure tested, surfacing, new guides, porting and and a valve job with the stainless/inconel valves and other fancy bits.
I found an M52 block but the guy had thrown away the bearing caps......
So much sadnesses
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