I have an older set of eagle sir small block rods. I can't seem to find a Definate torque spec for them. They have nuts on them i.e. don't thread directly into the rod and it looks like eagle has gotten away from this design. I have found people recommending 40, 45, and 50 for them. Just want to be sure I get it rught. A stretch spec is fine as well. they are 3/8 bolts with a 7/16 12 pt nut and the only markings i see on them is arp on the head of the bolt.


thanks in advance.

You need to call Eagle to get a definitive answer. Why take a chance on someones guess?

From an actual Eagle instruction sheet---(have only included the two ARP 2000 specs)

"ESP" Forged Steel H-Beam Connecting Rod Installation Instructions
Fasteners: Rod bolt threads and underside of head of the bolt should be lubricated with ARP Moly Assembly Lube. Do not use oil or Loctite. Warning: If any other lubricant is used on the bolt, bolt stretch method must be used due to different viscosity lubricants. Improper bolt torque will cause premature bolt failure. Cap should be seated on rod by aligning cap by hand and lightly tapping into place. Alternatively tighten bolts to avoid cocking cap.

Torque Specs:
-------Bolt-----------Identification----------Torque--------Bolt Stretch
7/16 ARP 2000---7/16 bolt head--------75 ft lbs-------.0064-.0068
3/8 ARP 2000----7/16 bolt head--------43 ft lbs--------.0055-.0059

Primarily because it's Saturday and they are closed. I've had 43 in my head all day. I'm just checking bearing clearance right now so I'll probably go 40 and it will work for that at least

Be very, very careful with that SIR rod. I think I would rather run a well prepped stock rod over that piece of crap.

Ya I was actually just reading that the older rods with the nuts have a high failure rate. I've had good luck with the newer stuff

This is why you should call Eagle. The torque specs given are for ARP 2000 bolts and I'm pretty sure that is not what you have.They are also for an H beam rod that threads into the rod body. ARP makes a world of rod bolts and they are made to the specs of the rod builder. A budget rod gets a budget bolt. My machine shop showed me some of these bolts that came in older Eagle rods that were having bolt failures and he said he believes the bolts were made in China, they were simply marked ARP on the 12 point head. I would wait and talk to ARP on Monday, I have found their Tech dept to be very helpful, and then talk to Eagle and see what they say. Or, you can take a chance and carry your engine home in a sack.

thanks. As I said I'm just checking clearances at this point. I'm not one to cut corners cuz something "has to go together today". Just made an assumption that someone may have the specs. My bad

Here's Eagle's torque specs from their web site LINK.

However, my experience has been that using torque #s doesn't give accurate bolt preload compared to measuring bolt stretch or using a "set to #lbs, then tighten an additional xx degrees" method (when available).

Ya those are all for bolts or what I would call more of a cap Screw. These have nuts on them. It almost seems like they used to have some that they wouldn't list a stretch for and recommended only to torque them. Not sure. Either way I have a stretch gauge and stretch everything if I have a spec for it.

Got on the horn today and for what it's worth to anyone who stumbles across this in the future, it's 50 ft-lbs or .006-.0067 stretch As per eagle themselves.

Good on ya! For example, yesterday, I was prepping my Manley H beams by putting new ARP 7/16 cap screws in that were the spec Manley wanted from ARP for their rod. Manley calls for 70 ft.lbs or .0059 to .0063 stretch, using the ARP moly assembly lube. The spec said if no ARP moly lube, use straight 30 weight and 90 FT. lbs. I chased the threads, used plenty of ARP moly, measured the bolt length and the torqued to 25,50, and 70, measuring the stretch at each increment. At 70 ft. lbs. the stretch was only 4.5 to 4.7 on every one of them! I ended up with an average of 85 ft. lbs. to get proper stretch. I would back each one down to about 60 lbs and then take it back in one smooth pull to the next 5 lb. increment. Just shows that there are no absolutes and a stretch gauge is a good investment. My Proto torque wrench was just certified by an aerospace instrument company near the airport, so I know it is accurate. I wonder how all those engines stayed together through the years that I just torqed to spec!

I am always amazed at how many motors are/were built without checking any clearances and torquing everything with junk torque wrenches and still don't blow up.

And ya I torqued these to 50 to check and they only had .005 stretch. I imagine in an application where u aren't truly pushing something to its limits there is somewhat of a window that is "close enough". But once u have the tools to do it right close enough doesn't exist any more it's either right or not right yet