Bushing six pack rods for 1.094 pins

[polyjohn]

Merry Christmas to all on B-Bods.

Has anyone done rod bushings recently on sixpack rods?
If so where did you get your bushings from please.

Happy new Year from PolyJohn UK

 

[gtxdana]

Merry Christmas to all on B-Bods.

Has anyone done rod bushings recently on sixpack rods?
If so where did you get your bushings from please.

Happy new Year from PolyJohn UK

Scat rod bushings would probably work depending on the width. Summit sells them but they just have them dropped shipped from Scat. Try a B1094 bushing.

By the time you buy bushings, pay for the machine work to bush the small end, resize the big end and replace the bolts, you would be better off, and have a better end result to just buy a set of new H-beam rods.

 

[gkent]

Not to mention saving a ton of weight in a very good place !!

 

[Geoff 2]

How does it save a 'ton' of weight?

 

[gkent]

Buying new rods … those 6-pack rods weigh a ton.

 

[eldubb440]

those 6-pack rods weigh a ton.

each?...... or in the cumulative?

 

[Rishi]

each?...... or in the cumulative?

Cumulative. I cannot comment on how much more they weigh, but it's seems generally accepted they are heavy, compared to alternatives. In fact, they may be the heaviest choice for connecting rods, out there.

The rotating mass is one of those big factors allowing an engine to rev higher, and produce more power before flying apart.

Some argue Chrysler made the rods thicker and heavier, to make them stronger, because they had no other choice back in the day. But modern day, by comparison, we have improved metallurgy and engineering to make stronger and lighter weight rods.

IMO, the biggest reason to use six pack rods in a 440 HP engine rebuild is mostly to keep it factory original, in an area that doesn't really show. I would be tempted to use these rods in a numbers-matching restoration. But once I started putting in alternate heads, roller lifters, and other non-original items, I'd have to have some compelling reasons for staying with the original rods.

 

[gtxdana]

Cumulative. I cannot comment on how much more they weigh, but it's seems generally accepted they are heavy, compared to alternatives. In fact, they may be the heaviest choice for connecting rods, out there.

The rotating mass is one of those big factors allowing an engine to rev higher, and produce more power before flying apart.

Some argue Chrysler made the rods thicker and heavier, to make them stronger, because they had no other choice back in the day. But modern day, by comparison, we have improved metallurgy and engineering to make stronger and lighter weight rods.

IMO, the biggest reason to use six pack rods in a 440 HP engine rebuild is mostly to keep it factory original, in an area that doesn't really show. I would be tempted to use these rods in a numbers-matching restoration. But once I started putting in alternate heads, roller lifters, and other non-original items, I'd have to have some compelling reasons for staying with the original rods.

Having a numbers matching block is reason enough to not reuse some heavy, fifty-year-old rods! The value of a numbers block goes way down when it has a hole in the side when a rod decides to exit.

I just weighed a few of six pack rods I have here. 925-935 grams on the cheap scale I have at the house. The Scat H beams I used in my 440 were 860 grams.

 

[PROSTOCKTOM]

I can sell you Molnar Technologies 4340 H-Beam, 6.76" long, 1.094" bushed pins, with 7/16" ARP 2000 rod bolts, stock replacement connecting rod that weighs 852 grams.

You'll save some weight and be several times stronger than a 55 year old connecting rod and have a larger rod bolt.

FOR SALE - Molnar Technologies 6.76" 4340 H-Beam Wedge Stock Replacement Connecting Rods - 852 Grams

Tom

 

[Rishi]

The value of a numbers block goes way down when it has a hole in the side when a rod decides to exit.

I had one of those! I gave up the matching 440HP block to the car back in the 1980s when it became clear it's couldn't be repaired in a way that wouldn't be seen from the outside. To this day, I regret doing it.

 

[polyjohn]

Great replies guys!

Yes its a 1971 440 GTX (matching numbers) engine which will be as original as possible.
How fast can you go with a six-pack rod?

We ran them down to 10.20 without fully lightening them and just honed out for full floating pin.
They didn't scuff the pins and the only failure we found was bigend bearings starting to pick-up.

So we are now taking them down to below LY rod weights, but no where near modern rods.
Plus we want to have nice bronze bush to aid the small end.

Happy Christmas to all the Mopar folks who still love their old Mopars.

 

[polyjohn]

Scat 440 rod with the 1.094 bushing is $649.
I guess that's about the cheapest old style non .990 rod?

Could not see a weight for them on the Ebay advert.
I get my six-pack rods down to 850 grams (600g BE and 250g SE).

Had a set in my 500 cube hemi and they got smashed to pieces after a bearing seizure.
Once a bearing goes, it don't matter what rods you are using DOH.

 

[BSB67]

What pistons are you using, and what is their weight?

 

[gtxdana]

Scat 440 rod with the 1.094 bushing is $649.
I guess that's about the cheapest old style non .990 rod?

Could not see a weight for them on the Ebay advert.
I get my six-pack rods down to 850 grams (600g BE and 250g SE).

Had a set in my 500 cube hemi and they got smashed to pieces after a bearing seizure.
Once a bearing goes, it don't matter what rods you are using DOH.

View attachment 1777749

Summit has the Scat H-beam rods for $577.

The box mine came in shows 596 on the big end and 263 on the small end for 859 total.

The stock six pack rods I didn't use ranged from 900 to 935 grams. How's that for a factory allowed tolerance. A pretty heavy rod for still having a 3/8" bolt. At least with the aftermarket rods, you get doweled caps, a 7/16" cap screw and less weight.

Yes, when that rod bearing starts welding itself to the crank journal, the rod is only going to bend so many times before it finally breaks.....and tears up your block and your wallet!

 

[RemCharger]

Merry Christmas to all on B-Bods.

Has anyone done rod bushings recently on sixpack rods?
If so where did you get your bushings from please.

Happy new Year from PolyJohn UK

I was planning on bushing the rods if I ever put my 383 back together.. this was all I found back then. Can't confirm if they work but , here it is

 

[WS23U1]

Unless you really, really want to use the 6 pack rods, no matter how much you spend on them you still end up with the 3/8 bolts. Now I'm not saying that's all bad but an Improvement in the bottom end is always good insurance.

 

[lewtot184]

Stock rods are nominally 846grms. 6pak rods are in the 900grm range. All h- beam stock length rods I've seen will be heavier than stock, but it varies. I have a set of h- beam 1.09 pin rods that are around 850grms that I'll never use. I think something people will ignore is the big end width. I don't like a bunch of side clearance on a driver; racer it may not matter as much.

 

[BSB67]

My Eagle H-beam are 880 gr.

 

[dvw]

What is the purpose of lightening a 6 pac rod and then trying to pit more power to it? Machine work, weaker piece, time, money, and then trying to add power. Sounds like an exercise in futility.
Doug

 

[lewtot184]

I think the question about what pistons are going to be used is very relevant.