1970 440 motors

[earlytime]

I would like to know if all the 70 440 use the 6pack parts in the motor?? If they used them in the Motorhome engine also??? Just check I have a chance at a 70 440 from a motorhome, what should I look at on this motor??



Thanks Mike

 

[IQ52]

Nope, not all the 1970 440 engines were equiped with HP rods.........plus, all the original motorhome engines I have seen from 1970 were the 413 industrial engines and were not 440s.

 

[Donny]

440 HP rods are big monsters, not free-revving beauties you may way?

 

[earlytime]

what is the easy way to tell the differance between them the # on the pad or side of block????

 

[Meep-Meep]

The engines with six pack rods had an externally balanced rotating assembly so there will be an offset weight on the harmonic absorber and converter. Other than that I don't think there were any identifying numbers.

 

[moparmarks]

I give my 6-pack rods to an artist buddy and makes table lamps and such out of them.

 

[451Mopar]

I just sold my old '70 440 HP (4-bbl) that needed to be rebuilt, but it had the external weighted crank dampner. Got $900 for it (carb to pan with manifolds.) Not sure if the price was too low, but it will be getting a nice new home in a '70 Superbird tribute (clone.)

 

[tallhair]

what is the easy way to tell the difference between them the # on the pad or side of block????

if the oil pan is off reach up and grab one ... 6 BBL Rods are meaty mothers.

 

[IQ52]

Reach up and grab one?

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Reach up and grab one?



REACH UP AND GRAB ONE?

 

[tallhair]

Reach up and grab one?

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Reach up and grab one?



REACH UP AND GRAB ONE?

Reach up from the bottom and grab one of the connecting rods. they are quite large and obviously different by feel than any other Mopar connecting rod.

what is your point?

 

[earlytime]

thanks to all will be looking at it soon

 

[RustyRatRod]

There are a lot of advantages to the bigger rods, or Chrysler would never have used them. The 1969 1/2 440 Six Pack A12 cars were some of the fastest cars of their time. I laugh everytime I see or hear somebody hollerin about them being "to heavy". Anybody wanna get rid of a set, let me know.

 

[rev.ronnie]

A standard 426 Hemi rod makes the six pack rod look like a toy. It's probably a couple hundred grams heavier and the hemis revved just fine. The Grand National rod is even a hundred grams more, I just compared the difference the other day.

My six pack engine revs great with six pack rods. With Wiseco pistons, my bobweight total is less than a stock 440 piston/rod assembly. I had to remove quite a bit of material on the counterweights to balance the crank with the external balancer. I could have gone internal on the front, but I wanted the correct looking balancer.

The six pack rods tend to be heavy on the pin end. Using a nice, light piston pretty much cancels out the extra weight.

 

[Meep-Meep]

There are a lot of advantages to the bigger rods, or Chrysler would never have used them. The 1969 1/2 440 Six Pack A12 cars were some of the fastest cars of their time. I laugh everytime I see or hear somebody hollerin about them being "to heavy". Anybody wanna get rid of a set, let me know.

Pretty much took the words right out of my keyboard!

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A standard 426 Hemi rod makes the six pack rod look like a toy. It's probably a couple hundred grams heavier and the hemis revved just fine. The Grand National rod is even a hundred grams more, I just compared the difference the other day.

My six pack engine revs great with six pack rods. With Wiseco pistons, my bobweight total is less than a stock 440 piston/rod assembly. I had to remove quite a bit of material on the counterweights to balance the crank with the external balancer. I could have gone internal on the front, but I wanted the correct looking balancer.

The six pack rods tend to be heavy on the pin end. Using a nice, light piston pretty much cancels out the extra weight.

I recall reading some old info where using hemi rods in the 440 was recommended for high RPM. And this was from Landy. I have the early max wedge / 300J rods in my 426W and those are probably the best compromise between the 6 pack and STD 440 rod. They are a 440 sized beam but with a squared off area around each rod bolt.

On my hemi the WISECO pistons and K1 H beams were responsible for making my crank counterweights look like Swiss cheese. Had I been thinking I would have stuck the crank in the lathe and cut .1" or more off. The deep holes won't hurt a thing but it sure would have made a cleaner balance job and saved the guys drill bit!

 

[earlytime]

So what are some of the numbers used on the 6pk rods???? thanks mike

 

[PurpleBeeper]

There's a good chance that a 1970 motorhome 440 will have the six-pack rods. First, verify the year of the engine and casting number on the passenger side of the block.

2536430 Chrysler - Dodge - Plymouth RB 66-72 440
3698330 Chrysler - Dodge - Plymouth RB 73-78 440

The small rod 440's with a forged crankshaft ('66-'73) will have a harmonic balancer that is symetrical & about 1" thick.
The six-pack rod 440's w/forged crankshaft ('70-'74) have an offset weight cast into the inner circle (as viewed from the front) and is also about 1" thick.
Cast Crank 440's ('74-'78) have 2" thick cone or 2" round harmonic balancers that often say "for cast cranks" on them.

If you can see inside the engine/oil pan/bottom end then six-pack rods are the same width (2"-ish) all the way from the crank end up to the piston wrist pin. Standard/small 440 rods get narrower (to about 1-1/4") towards the piston wrist pin.

'67-'69 HP & '66-'73 Standard 440's used small rods
'69 440 six packs used small rods
'70-'72 440 six packs used big rods
'70-'74 heavy duty / motor home 440's used big rods

My short block is from a '73 motor home & it came with the big rods (six-pack rods) and the harmonic balancer with the offset weight. It has a weighted flywheel too (or torque conveter/flex plate for automatics)

 

[62MAX]

There are a lot of advantages to the bigger rods, or Chrysler would never have used them. The 1969 1/2 440 Six Pack A12 cars were some of the fastest cars of their time. I laugh everytime I see or hear somebody hollerin about them being "to heavy". Anybody wanna get rid of a set, let me know.

The 69 1/2 cars used the standard LY rod,the heavy rod started in 70.

 

[Cranky]

ChryCo actually created more warranty problems when they went to the larger rods in 70 because they used the same size and strength rod bolts. Upgrade those and polish the beams (should do that for any high performance engine) and you should have no problem with the heavier rod. With that said, a lighter rotating assembly will generally rpm faster than a heavier one.