Im trying to find out the torque settings/procedure for the ARP rod bolts my buddies bought for his motor. They're ARP2000 bolts in SCAT rods. Theyre 7/16" by 1.8" long.

ARP doesn't give torque specs for their rod bolts anymore and insists the only accurate way to install them is by the "measured stretch" method.

Huh ?!?!? I just had a motor done in the last 4 weeks and the ARP2000 rod bolts were "torqued" to spec. I'll see if I can find the sheet.

http://www.arp-bolts.com/Tech/TechTorque.html

Keep in mind different lube will change the torrgue amount There is another chart some where for that.

So do I have to use ARP lube then or can I use light oil? What is the stretch method? sorry its just ive never usedthese bolts before! Any info would be a big help!

I just finished a short block with the same rods & bolts. The machinist who supplied the parts told me 65 ft lbs with arp lube or .0054 stretch.

You need to use a bolt stretch gauge. I looks like this. The one in the picture is made by pro-form

btw get yourself the stretch gauge you will need it more than once.

I know that a strech gauge is the prefered way but there are 1000's of motors built and run succesfully using nothing but a torque wrench.

sure there are. i have buildt many of them.
But since i used to work with calibrating torque wrenches i just don trust them any more besides the gauge isnt that expensive just my

The hughes 426 kit I recently did, all but one bolt was within stretch specs at 63-65 pounds, I kept bumping the TQ a bit at a time because that one bolt would not go past .004 so I used a new bolt on that one.

I also checked them all at 50 pounds to see if they had equal stretch, all did but that one mentioned.

Right or wrong this works for me, I feel without the way to check the stretch that one rod bolt might of caused some issues down the road.

The gauge is semi easy to use, just use it the same way on every bolt.

Quote:

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all but one bolt was within stretch specs at 63-65 pounds, I kept bumping the TQ a bit at a time because that one bolt would not go past .004 so I used a new bolt on that one.

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???? So it looks like you don't trust the stretch method !!

Anyhow, I'm curious as to what the wrench looks like since the gauge would be in the way of a socket.

Maybe I posted wrong but the stretch method is the only way to go imo.

Yes chances are the sheet that says x pounds and so many degrees might be on most the time, however as I mentioned without the gauge I would of had one rod bolt way low on stretch and possibly a big problem from it.

I would not do anything without the stretch gauge.

A long while back I was looking into the whole stretch vs tq method, found this on a chevy site, dude mixed up on a bolt size vs head bolt size.

How could one not know as posted with this pic, "It wouldnt tighten at 75 pounds"

FWIW

My Scat rods with the Arp 2000 bolts were all at almost perfect stretch at 65 ft lbs with Arp molly lube.I think 1 of the bolts was off by .0001.-Randy

I dont expect everyone to understand my chicken scratches, these were up to 63 pounds and Im pretty sure I clicked them one time at 65 as mentioned just for kicks. But I rounded down on my 63 lb numbers.

I wont use bolts over or on a freshen up.

The number 2 outter is what I could not get right so I used another new bolt.

Im sure the experts have a different or better (More Correct) way, however ive not had one come apart yet.

This was my bench copy, then I make a puter copy.

Ive read mixed things on the ARP 2000 bolts and the "proper way to install them" from an actual ft pound figure to a certain pound and then so many degrees.

I get them at .0055 and that seems to work for me.

How do others do it?????