My 68 R/T

[Piston_Freddy]

Thanks tan top! Anybody else want to chime in on the balancer issue? OEM or new aftermarket one? What kind a aftermarket one to get?

[Piston_Freddy]

Just got back from the parts store.They can't order from Summit and Rockauto hasent' listed any balancers. I think the only way is if someone orders a balancer and then sends it to me? I was planing on buying this one: http://www.summitracing.com/parts/SUM-163383/

[firefighter3931]

don't think you have a cast crank in there looking at that balancer ,  not 100% but think all 70 motors got the heavier sixpack rods as standard  , there should be a part number on the back side of the balancer think the later starts with 36 .....  best get the part number  from the one thats on there  , think the bolt holes are different for the bottom pulley  & there is a a couple of different balancer hole patterns  ,  i would look for a OEM one as opposed to getting an aftermarket one  , as  i'm sure you would be needing to rebalance the motor to do the job propperly , although these motors are internaly balanced  ,  when your rebuilding a motor you really need the balance  the crank with harmonic balancer  , that your going to use !!       i'm no expert  though on this  

Looking at Freddy's pics it appears that he does not have a 6-pack rod engine. I believe only the "HP" 375 horsepower motors got the heavier 6-pack rods. This motor coming from a chrysler most likely has the 350 horsepower 440 internals with a steel crank and LY rods.

Below is a pic of an externally balanced 440 with steel crank/6-pack rods harmonic balancer. Notice the additional weight attached to the face of the balancer   In freddy's pics this weight is not there so it's not a 6-pack rotating assembly, inmo.  

That being said, any balancer for a forged crank/internal balance will work fine.  


Ron


Pic of 6-pack balancer...which is different from Freddy's on the previous page 

[firefighter3931]

Just got back from the parts store.They can't order from Summit and Rockauto hasent' listed any balancers. I think the only way is if someone orders a balancer and then sends it to me? I was planing on buying this one: http://www.summitracing.com/parts/SUM-163383/

That balancer will work fine 


Ron

[terrible one]

Just got back from the parts store.They can't order from Summit and Rockauto hasent' listed any balancers. I think the only way is if someone orders a balancer and then sends it to me? I was planing on buying this one: http://www.summitracing.com/parts/SUM-163383/

That balancer will work fine 


Ron

For what it's worth, that's the balancer I'm using.

[tan top]

don't think you have a cast crank in there looking at that balancer ,  not 100% but think all 70 motors got the heavier sixpack rods as standard  , there should be a part number on the back side of the balancer think the later starts with 36 .....  best get the part number  from the one thats on there  , think the bolt holes are different for the bottom pulley  & there is a a couple of different balancer hole patterns  ,  i would look for a OEM one as opposed to getting an aftermarket one  , as  i'm sure you would be needing to rebalance the motor to do the job propperly , although these motors are internaly balanced  ,  when your rebuilding a motor you really need the balance  the crank with harmonic balancer  , that your going to use !!       i'm no expert  though on this  

Looking at Freddy's pics it appears that he does not have a 6-pack rod engine. I believe only the "HP" 375 horsepower motors got the heavier 6-pack rods. This motor coming from a chrysler most likely has the 350 horsepower 440 internals with a steel crank and LY rods.

Below is a pic of an externally balanced 440 with steel crank/6-pack rods harmonic balancer. Notice the additional weight attached to the face of the balancer  In freddy's pics this weight is not there so it's not a 6-pack rotating assembly, inmo. 

That being said, any balancer for a forged crank/internal balance will work fine. 


Ron


Pic of 6-pack balancer

thanks Ron    for sorting out my confusion
sorry if i confused anyone 

[firefighter3931]

thanks Ron    for sorting out my confusion
sorry if i confused anyone 

No worries Tan....your advise was partially correct. All the 375hp motors in 1970 got the 6-pack rods, but the std performance 440's with 350hp still had the lighter LY rods and were therefore internally balanced. It does get confusing at times. 

The balancer's design/appearance will usually tell the story 



Ron

[Piston_Freddy]

Thanks Ron! Looks like SUM-163383 balancer it is then. Yeah its just a 350hp 440.

Doesn't look like stock chain and sprockets? Engine was built in 2006, so I think I'll leave it like this? Chain has 0.3937 inch play.

[firefighter3931]

Thanks Ron! Looks like SUM-163383 balancer it is then. Yeah its just a 350hp 440.

Doesn't look like stock chain and sprockets? Engine was build in 2006, so I think I'll leave it like this? Chain has 0.3937 inch play.

Freddy, don't worry about the chain...it's fine. That is definately not a stock timing set. The chain is nice and snug on the left side which is the direction of engine rotation. If there was a lot of slack on both sides it would need replacing. 

I doubt that there is much milage on this engine if the rebuild is that recent. 

I see you have some nice Firecore ignition wires on your motor with the MSD pro-billet distributor. That is an excellent setup ! 



Ron

[Piston_Freddy]

Thanks Ron! Yeah ignition system works fine!  


Big thanks to moparsal again, i have all the parts i needed thanks to him.

Summit balancer,Percy's header gaskets and carb calibration kit.


Got new valve covers and air cleaner, looks better with black engine compartment and now the 1/2 carb spacer fits.With the old air cleaner the hood was against it(torker intake).Old cleaner and covers are gonna go on a '70 Charger.



Taped a camera on the dashboard and went for a drive: http://www.youtube.com/watch?v=eYap_Vtq9Kk

There is a hesitation off idle and when the secondaries come in.