[BB70]

Hi, need some help identifying these rods and bolts. I think they are Tomahawks w/8740 bolts but not positive. They are a .980 floating small end, 7/16 bolt head & threads, aprox 8 years old
Thanks, John

[mysticmissle]

The rod cap marks and overall design appear very similar to a set I got from Ace PPR about the same time frame. I don't remember the.beams.being marked but it was a while ago. I never had an issue with them. They took a beating

[BB70]

Originally Posted by mysticmissle

The rod cap marks and overall design appear very similar to a set I got from Ace PPR about the same time frame. I don't remember the.beams.being marked but it was a while ago. I never had an issue with them. They took a beating

Thanks mysticmissle, you don't remember the bolt torque-stretch by chance ?
From what I'm finding for 8740 bolts its 66ftlb, .005-.0055.
John

[mysticmissle]

Just use the arp spec

[steve25]

The ink stamping for the C to C length leads me to say that they are Eagle.

[TinInjun]

Not an eagle rod. Does not have the machined rib down the center of the "H"

[BruceWilkie]

Originally Posted by steve25

The ink stamping for the C to C length leads me to say that they are Eagle.

My Compstars also had an ink stamping that looked like that... Eagles have the extra "rib". Compstars come standard with ARP2000 bolts.

Pretty sure Aces rods came from RPM... Good rods!

[Aaron Quinton]

http://www.eaglerod.com/mosmodule/bolt_torque.html

[92GA]

Originally Posted by BB70

Hi, need some help identifying these rods and bolts. I think they are Tomahawks w/8740 bolts but not positive. They are a .980 floating small end, 7/16 bolt head & threads, aprox 8 years old
Thanks, John

They look like the Tomahawks I have in my 406. I bought them in 04, still in the engine with original bearings, been checked a few times, still looked real good the last time I had it down couple years ago. My son-in-law owns it now, just sitting. I just looked up the torque specks he sent me with the rods, 65 ft lbs no less, no more. The engine has many passes turning 6500 or better, was still running good when we pulled it.

[BB70]

Thanks for all the input, you guys and this website are great.
John

[gtofreek]

The lube used is very important. 65 LBS. with ARP Ultralube would be about right. If 30 weight motor oil is used, you usually need to go about 15 lbs. more to get the same stretch. I prefer to use ARP Ultralube. It's more consistent. The correct stretch will probably be more like .006"-.0065" for the 7/16" bolt.

I have spec sheets at work I will try to remember to double check in the morning.

As mentioned already, it's NOT an Eagle rod.

[92GA]

Originally Posted by gtofreek

The lube used is very important. 65 LBS. with ARP Ultralube would be about right. If 30 weight motor oil is used, you usually need to go about 15 lbs. more to get the same stretch. I prefer to use ARP Ultralube. It's more consistent. The correct stretch will probably be more like .006"-.0065" for the 7/16" bolt.

I have spec sheets at work I will try to remember to double check in the morning.

As mentioned already, it's NOT an Eagle rod.

I was really surprised when they didn't give the stretch measurements instead of torque when I bought them. Nothing in the box as what the bolts torqued or stretched to. Had to contact them a couple times to get what he sent me. I would never bought from him again. I did try a search a while back couldn't find any info. They must have closed up shop.

[lust4speed]

I'm not sure when Ken started using RPM International, Inc. for his cranks and rods (RPM website), but he did for quite awhile up to the time he closed. They were located within 10 miles of his shop, but I see that they have moved to Brea, CA. It is very important to check products from all manufacturers today for defects, and that applies to their products.