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6.8 rods

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Post  rivet February 4th 2021, 10:59 am

Looking for information and if these are still available. I have 6.8 h beam rods that have 6800 stamped on the beam and 11d on the pad were the rod bolt goes through. The big end is 529 grams and the small end is 237 grams- total rod is 766 grams. Also the rod bolts are ARP 8740-06. I’m not the original purchaser they are in an engine that I acquired, reason I’m looking is because one of them is bent. Thanks in advance for any help that I receive.

rivet

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Post  rmcomprandy February 5th 2021, 4:36 pm

rivet wrote:Looking for information and if these are still available. I have 6.8 h beam rods that have 6800 stamped on the beam and 11d on the pad were the rod bolt goes through. The big end is 529 grams and the small end is 237 grams- total rod is 766 grams. Also the rod bolts are ARP 8740-06. I’m not the original purchaser they are in an engine that I acquired, reason I’m looking is because one of them is bent. ¬†Thanks in advance for any help that I receive.

A 6.800" long, H-beam rod with ARP 8740 bolts is available from at least 5 different companies

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Post  rivet February 5th 2021, 5:23 pm

I understand that there are manufacturers that make them,my dilemma is I need one that weighs 766 grams. The major manufacturers that I’ve talked to say there’s are all over 800 grams. I am hoping that someone on here might know something about what I have. I’m not wanting to change the whole set and rebalance the assembly if I don’t have to.

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Post  Lem Evans February 5th 2021, 7:01 pm

I can get you Molnar rods that are less than 800gm

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Post  rivet February 5th 2021, 7:24 pm

Lem do you know the weight off hand.

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Post  Lem Evans February 5th 2021, 8:21 pm

I'll call and make sure.

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Post  Mark O'Neal February 8th 2021, 3:38 am

I don't know id Lem ever got back to you...but Molnar lists them at 830 grams

The Chevy BB Version lists at 749. As Lem Suggested, you'd have to call Ed and get the weights of what they actually have on hand.

Mark O'Neal

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Post  Lem Evans February 8th 2021, 12:46 pm

rivet wrote:Lem do you know the weight off hand.


750ish

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Post  Lem Evans February 8th 2021, 12:46 pm

Mark O'Neal wrote:I don't know id Lem ever got back to you...but Molnar lists them at 830 grams

The Chevy BB Version lists at 749. As Lem Suggested, you'd have to call Ed and get the weights of what they actually have on hand.

830 is the power adder rod.

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Post  gt350hr February 8th 2021, 3:57 pm

Might be a RPM International rod.

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Post  Mark O'Neal February 8th 2021, 4:12 pm

Lem Evans wrote:
Mark O'Neal wrote:I don't know id Lem ever got back to you...but Molnar lists them at 830 grams

The Chevy BB Version lists at 749. As Lem Suggested, you'd have to call Ed and get the weights of what they actually have on hand.

830 is the power adder rod.

The BB Chev Power adder is different from what he lists for the 460. The 460 has a 1.125 wide pin end, the BB Chev power adder is 1.065.

Not sure why scratch

Also don't know if he changed the offset on the Ford version.

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Post  Mark O'Neal February 8th 2021, 4:14 pm

gt350hr wrote:  Might be a RPM International rod.

They're about 835 grams.


Last edited by Mark O'Neal on February 9th 2021, 12:36 am; edited 1 time in total

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Post  rivet February 8th 2021, 6:28 pm

So basically in a nut shell I’m more than likely not going to be able to find an exact match to what I already have. So my next dilemma is which way to I need go for new rods so that I will have the best route for balancing. Don’t want to end up adding a bunch of heavy metal or turning it into Swiss cheese (the crank). How close total weight for the new rods do I need to keep within , and which way should I go (heavier or lighter) thanks for the help

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Post  Lem Evans February 8th 2021, 7:50 pm

The only way to get the light big block rod, from Molnar, is the std. wt. bbc off set units.

The on center BBF rods are ~ same wt. as power adder bbc.

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Post  Lem Evans February 8th 2021, 7:56 pm

I'm not sure what power/rpm level you are at but, in most applications I would not want a 760 gm rod.

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Post  rivet February 8th 2021, 9:04 pm

Lem, was kind of leaning that way with those light of rods. It’s only in the 450-500 hp range and under 6500 rpm. I guess now I need suggestions on what and who’s rod to use with as little as extra work on the balancing to do.

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Post  Mark O'Neal February 10th 2021, 12:48 am

rivet wrote:Lem, was kind of leaning that way with those light of rods. It’s only in the 450-500 hp range and under 6500 rpm. I guess now I need suggestions on what and who’s rod to use with as little as extra work on the balancing to do.

That rod will work fine for your application. As for the balancing; you can mess with rod weighs a bit, pistons weights a bit, and pin weights a bit. After that...it is what is is.

Just remember that hot rods do not run on gas, hot rods run on money.

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