It is indeed
Last time I had access to GM tis it translated the stretch out to 260 ft/lbs so torque it down and be done it ain't gonna back out.
Crank balancer bolt help needed
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It is indeed
Last time I had access to GM tis it translated the stretch out to 260 ft/lbs so torque it down and be done it ain't gonna back out.
I agree. I don't even torque them most of the time. Just a good pull with my 4ft 3/4 ratchet
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Not that it mattered, but GM listed the torque for the bolts with the LB7 motors. I checked 4 different year Duramaxes, and got 4 different torque specs.
2001 LB7 lists torque spec as 278 lb-ft
2003 LB7 lists 260 lb-ft
2005 LLY lists 74 lb-ft plus 90 deg
2007 LBZ lists 74 lb-ft plus 105 deg
2001 LB7 lists torque spec as 278 lb-ft
2003 LB7 lists 260 lb-ft
2005 LLY lists 74 lb-ft plus 90 deg
2007 LBZ lists 74 lb-ft plus 105 deg
Got it all done, put together and running. Got the new ARP bolt and washer, which is 27mm. Instructions in the package said torque to 255 ft lbs. Well I torqued her to 74 ft lbs and then gave her another 105 degrees. Put hell on my 1/2 in breaker bar (dont have a 27mm in 3/4 or any adapters) and had a good bit of flex in both breaker bar and jack handle. Took a bit longer to finish as I ended up tearing the o ring on the bypass pipe and had to get a new one. Replaced it and she's running like a sewing machine so far. No obvious leaks yet!
just a fyi stick to arp's torque on there bolts. there not stretch bolts like factory bolts.