70 440 rods???

[DoubleDlover]

ok. So. what is the big difference between regular 440 rods and 6 pac rods?  If you have a 70 440 hp wit hthat 6 pac balancer and 6 pac flywheel.. can you just run regular rods or do that have to be "6 pac" thanks

[cdr]

no,the sixpack rod engine is externally balanced cause the rods weigh a TON if you run the regular 440 rods you have to run the zero balancer & flywheel. 

[hemi68charger]

In '70 and '71, the bottom end of a 440 4bbl HP and a 440 6bbl were the same, the "heavy" rods and as some like to describe them as "six pack" rods...... They aren't, they are '70 and '71 rods (maybe some '72's had them). But, you will see the counter balance on the dampner. In '69 and earlier, there wasn't a need for the counter balance due to the rods being 'smaller' if you will......

You will need the correct '70/'71 rods (heavy, six pack or whatever is the name-of-the-day).....

[DoubleDlover]

hi ok. Looks like we are getting somewhere on this. So it sounds like as long as i run the "heavy" rods im ok running the special flywheel and balancer. So how do i tell the heavy rods from the normal ones? Part number? Or is there some tale tell shape. Meaning if im at the swap meet. what do i look for? thanks

[cdr]

Part #    

Engine
   Length

2406766
   64-71 383
64-66 361
72-74 400    6.358

2406770
   62-64 413
62-64 426 Wedge
68-69 440 4BBL
70-74 Except High Performance    6.768

3462426
   69 440 3x2 BBL    6.768

2951906
   70-74 440 High Performance
70-72 440 3x2 BBL    6.768

[DoubleDlover]

hi. ok .So i guess i should look for # 2952906 only? or whould the 3462426 also be ok and work? thanks

[hemi68charger]

hi ok. Looks like we are getting somewhere on this. So it sounds like as long as i run the "heavy" rods im ok running the special flywheel and balancer. So how do i tell the heavy rods from the normal ones? Part number? Or is there some tale tell shape. Meaning if im at the swap meet. what do i look for? thanks

The beam of the rod is wider, but inless you have a '69 and earlier, you might have a difficult time mentally comparing them. If you could get a picture with a tape rule here of a "heavy" rod, that'll make it a lot easier. I just don't have any heavy rods laying around...... You need part #2951906 with casting # 2951908

http://www.440source.com/stockrods.htm

Picture is from an ebay ad I found - casting # 2951908

[DoubleDlover]

hi yea i seen that on ebay. So that is a 6 pac heavy rod huh?? oh yea. And if i dod just run regular rods.. What would really happen? thanks

[Cooter]

hi yea i seen that on ebay. So that is a 6 pac heavy rod huh?? oh yea. And if i dod just run regular rods.. What would really happen? thanks

Will be horribly out of balance. Won't last a couple thousand miles. then, No oil pressure and possibly a knock. Just get another Pass car bottom end with steel crank, steel crank balancer and "LY" rods. Lighter, will rev better, and not slinging as much weight.

[DoubleDlover]

hi. I was thinkign that. But i already have the crank flywheel and balancer. hp set up. If i didnt have that all i would probably do that.  gues i better stick with the heavy rods.

[hemi68charger]

hi. I was thinkign that. But i already have the crank flywheel and balancer. hp set up. If i didnt have that all i would probably do that.  gues i better stick with the heavy rods.

Go get some, have them magnafluxed, balanced along with the pistons and go for it !!!   

[moparstuart]

http://holland.craigslist.org/pts/3510351168.html

[71green go]

Sorry to Jump on board this thread but...reading this has me worrying

My Engine was a 71 440 in an R/T so I assume it had the heavy six pack rods.....

I had the Engine rebuilt and my Builder used lighter Rods....Not Sure what out of.......

But I assumed it was the steel Crank that made it required to use the balancer that was on my engine.....

I reused the 71 "six pack Balancer" is this going to cause issues??.....

Do I need to find a Different Harmonioc Balancer now?...........

[cdr]

Sorry to Jump on board this thread but...reading this has me worrying

My Engine was a 71 440 in an R/T so I assume it had the heavy six pack rods.....

I had the Engine rebuilt and my Builder used lighter Rods....Not Sure what out of.......

But I assumed it was the steel Crank that made it required to use the balancer that was on my engine.....

I reused the 71 "six pack Balancer" is this going to cause issues??.....

Do I need to find a Different Harmonioc Balancer now?...........

call the engine builder & find out how it was balanced internal or external.

[Cooter]

Many Machine shops balance engines when swapping rods. If they did, they might have had to use what's called "Mallory metal" which is heavy and can Re-balance an Originally External to Internal, and Vise Vera. I would think if they swpaped the rods, they woulda balanced it.

[justcruisin]

When I pulled my 70 440 magnum down I found 7 heavy rods and one ly rod. The ly rod had been weighted up on the big end. I ditched the lot and used K1 h beams.