6 barrel 440 hp engine/trans

[70phoenix]

Working on going through my superbird and putting everything back to numbers correct. I'm discovering my motor is a mixture of original parts and not originals.  Its a original 6 pack car. Few questions, can somebody post a picture of the correct HP harmonic balancer so I can make sure mine is correct ?  How would I tell if I have the correct crank ?  Does anybody make a direct replacement for the 440 6 barrel cam ?

[hemi68charger]

The 440+6 camshaft back in the day was pretty much had the same profile as the 440 4bbl Magnum/Super Commando except structurely, it had a 3-bolt camgear design like the 426 Hemi camshaft. The lobes had a special treatment as well. But, in all practical sense, you could throw in a Item# MPPP4452783 (383 Magnum/Super Commando/Road Runner and 440 Magnum/Super Commando) and it be the same.. The vibation dampner was nothing more than a 440 4bbl Magnum/Super Commando. 4bbl's and 6bbl's shared pretty much the same short block components.

Below is a picture a (left, '70/'71 heavy rod dampner) & (right, '69 and earlier dampner). Got it from a previous thread here. Disregard the writing. Albeit it is correct, it gives the wrong impression that it is solely for a 6pack application.. false.

[hemigeno]

Does anybody make a direct replacement for the 440 6 barrel cam ?

If I were sporting a six-hole intake manifold using stock heads and exhaust manifolds, I'd be running one of Mr. SixPack's (Bob Karakashian) cam grinds.  Here's a detailed thread from Moparts.com about his stuff:

http://board.moparts.org/ubbthreads/showflat.php?Number=3117509

[moparstuart]

Bobs cams are great and after trial and error i would never run anything else in my six pak motor

[hemi68charger]

This "Bob" camshaft, does it produce enough vacuum at idle that every 6bbl car I've driven needs, especially with power brakes?

[moparstuart]

This "Bob" camshaft, does it produce enough vacuum at idle that every 6bbl car I've driven needs, especially with power brakes?

yes the mr six pak cam pulls great vac

[hemi68charger]

This "Bob" camshaft, does it produce enough vacuum at idle that every 6bbl car I've driven needs, especially with power brakes?

yes the mr six pak cam pulls great vac

The magic recipe for any dual-plane six pack OEM setup, vacuum.............

[Arnie Cunningham]

The 70 six pack crank does have a different part number from the crank in standard and hp 440s.  I have not found anyone who knows why.  Anyone??

[Arnie Cunningham]

Correction: the hp and six packs crank had a unique part number.  I pulled apart a stock untouched hp moter and a standard 440 side by side and could determine no difference.  Heat treating? 

[62 Max]

Correction: the hp and six packs crank had a unique part number.  I pulled apart a stock untouched hp moter and a standard 440 side by side and could determine no difference.  Heat treating? 

Heat treating would be correct,.006,once it's ground it is just another 440 HP crank..

[moparstuart]

                                                      Bob Karakashian
                                                      24269 Novi Rd.
                                                      Novi,  MI    48375           248-477-7776



   bob contact info 

[70phoenix]

thanks for the help

[xs29j8Bullitt]

Working on going through my superbird and putting everything back to numbers correct. I'm discovering my motor is a mixture of original parts and not originals.  Its a original 6 pack car. Few questions, can somebody post a picture of the correct HP harmonic balancer so I can make sure mine is correct ?  How would I tell if I have the correct crank ?  Does anybody make a direct replacement for the 440 6 barrel cam ?

My  ... FWIW... 

The 1970-72 440 Six Pack / 440 4BBL HP / "Big Rod" RB Engines / Etc.  were externally balanced by using both a weighted harmonic balancer (non symmetric ring) AND a weighted flywheel or torque converter.  Weighted flex plates and balance plates are available today to allow use of a neutral balance converter.

As for crank journal hardness, I believe the Six Pack cranks were shot peened, but not nitrided like the Hemi cranks were.

The low taper ratio camshaft design allowed for higher revs and longer cam life.  Mopar Performance sells reproductions, but Bob K's cams are superior... as are modern lightweight rods and many other modern replacement parts..

[71gtx]

70=71 440 4bbl hp 6pak are external balance the 72 440  hp are neutral balance.

3614371, 440 lp hp used on forged crank engines from 1972-75. Appearance and dimensions are the same as other forged crank dampers

same one as 4oo 4bbl 4speed





the flywheel for 70=71 440 4bbl hp 6pak 4speed car