Decisions, Decisions ... SB Harmonic Balancers

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dibbons

dibbons

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We have a steel crank, internally balanced 340 using 1972 Plymouth crankshaft pulleys. Street-driven automatic with once yearly 1/4 mile speed trials.
Eeny, meeny, miny, moe:

Jegs Page

Jeg’s Brand #555-51670 $89.99 exceeds OE specs (perform up to 6500 RPM) (pulley bolt pattern not specified) spherical graphite (AKA “near steel”) 7.1” 7 1/8 (Not SFI)

Jeg’s Brand #555-51640 $199.99 steel SFI 18.1 50 BTDC to 10 ATDC 7.07”

Fluidampr 720301 $435.99 (evenly spaced pulley bolt pattern) SFI 18.1 50 degree marking range

Mopar (performance?) cast OEM style #312-53020229 $133.99 7.25” OEM not SFi
(pulley bolt pattern not specified)

Mopar Performance cast OEM style iron #312-P4452816 $200.99 7.25” not SFI (drivers side timing mark?) (pulley bolt pattern not specified)

Mopar Performance steel #312-P5249690 $352.99 SFI (no foto, no other details)
features “universal” front pulley mount pattern (how?)
see: P5249690 - Chrysler Vibration Damper, Steel, 1967-91 273/318 Small Block, 1968-71 340 Small | Factory Chrysler Parts, Canton GA

PRW 228-2431841 7.30” SFI-rated $169.70 internal or external balance-no other details
(pulley bolt pattern not specified)

Summit Page:

*SUM-163273 $89.97 OE-style (Not SFI) degree markings yes 60 BTDC to 0 TDC 7.25” nodular iron/Elastomer for 1971 and later pointer on driver side
Do not use over 6000 RPM and do not use for racing
need to heat damper in boiling water to install or use installer tool
need to elongate offset bolt hole in early model pulleys

*SUM-C4277 internal balance $154.97 SFI 18.1 markings 60 BTDC to 0 TDC
6.610“ steel/elastomer use with ’71 and later timing cover with pointer on driver side
need to heat damper in boiling water to install or use installer tool
need to elongate offset bolt hole in early model pulleys

*SUM-C4278 external balance $157.97 SFI 18.1 markings 60 BTDC to 0 TDC
7.010” steel/elastomer
(pulley bolt pattern not specified)
use with ’71 and later timing cover with pointer on driver side
need to heat damper in boiling water to install or use installer tool
need to elongate offset bolt hole in early model pulleys
Trick Flow TFS-19010 $174.97 60 BTDC to 0 TDC steel/elastomer
(pulley bolt pattern not specified)

*above three are Summit Brand

Pioneer PIO-872020 $152.97 nodular iron/elastomer (Not SFI) markings 40 BTDS to 10 ATDC 7.080” use with driver side pointer weight is 7.70 lbs. (user up to 6500 rpm)
(pulley bolt pattern not specified)

Pioneer $209.97 PIO-872037 SFI 18.1 7.240”internal balance nodular iron/elastomer or steel?
(lists both on page) weight is 9.40 lbs
(pulley bolt pattern not specified)

ATI $339.00 ATI-91747OE SFI 18.1 360 degree markings 7.074” aluminum/elastomer
(pulley bolt pattern not specified)

ATI $329.09 ATI-917400E SFI 18.1 360 7.074” aluminum/elastomer
(pulley bolt pattern not specified)

ATI $329.09 ATI-91828E SFI 18.1 360 degree markings 7.074” steel/elastomer may
(pulley bolt pattern not specified)
require modifications for clearance
3-ring balancer will stick out forward an additional 0.450 in. further than a stock balancer. Hubs should clear most cast in timing tabs. Due to variations over the years grinding, cutting, and welding may be needed for clearance on some applications.

ATI $279.80 ATI-918442E SFI 360 degree markings 7.074” steel/elastomer
supercharged series (no thanks)
(pulley bolt pattern not specified)
 
Is the Pioneer steel? (Summit listing was confusing-depending on what section/page I was reading)

How is the Pioneer marked for degrees? Pulley bolt pattern standard or offset? Thank you.
 
dibbons said:
We have a steel crank, internally balanced 340 using 1972 Plymouth crankshaft pulleys. Street-driven automatic with once yearly 1/4 mile speed trials.
Eeny, meeny, miny, moe:

Jegs Page

Jeg’s Brand #555-51670 $89.99 exceeds OE specs (perform up to 6500 RPM) (pulley bolt pattern not specified) spherical graphite (AKA “near steel”) 7.1” 7 1/8 (Not SFI)

Jeg’s Brand #555-51640 $199.99 steel SFI 18.1 50 BTDC to 10 ATDC 7.07”

Fluidampr 720301 $435.99 (evenly spaced pulley bolt pattern) SFI 18.1 50 degree marking range

Mopar (performance?) cast OEM style #312-53020229 $133.99 7.25” OEM not SFi
(pulley bolt pattern not specified)

Mopar Performance cast OEM style iron #312-P4452816 $200.99 7.25” not SFI (drivers side timing mark?) (pulley bolt pattern not specified)

Mopar Performance steel #312-P5249690 $352.99 SFI (no foto, no other details)
features “universal” front pulley mount pattern (how?)
see: P5249690 - Chrysler Vibration Damper, Steel, 1967-91 273/318 Small Block, 1968-71 340 Small | Factory Chrysler Parts, Canton GA

PRW 228-2431841 7.30” SFI-rated $169.70 internal or external balance-no other details
(pulley bolt pattern not specified)

Summit Page:

*SUM-163273 $89.97 OE-style (Not SFI) degree markings yes 60 BTDC to 0 TDC 7.25” nodular iron/Elastomer for 1971 and later pointer on driver side
Do not use over 6000 RPM and do not use for racing
need to heat damper in boiling water to install or use installer tool
need to elongate offset bolt hole in early model pulleys

*SUM-C4277 internal balance $154.97 SFI 18.1 markings 60 BTDC to 0 TDC
6.610“ steel/elastomer use with ’71 and later timing cover with pointer on driver side
need to heat damper in boiling water to install or use installer tool
need to elongate offset bolt hole in early model pulleys

*SUM-C4278 external balance $157.97 SFI 18.1 markings 60 BTDC to 0 TDC
7.010” steel/elastomer
(pulley bolt pattern not specified)
use with ’71 and later timing cover with pointer on driver side
need to heat damper in boiling water to install or use installer tool
need to elongate offset bolt hole in early model pulleys
Trick Flow TFS-19010 $174.97 60 BTDC to 0 TDC steel/elastomer
(pulley bolt pattern not specified)

*above three are Summit Brand

Pioneer PIO-872020 $152.97 nodular iron/elastomer (Not SFI) markings 40 BTDS to 10 ATDC 7.080” use with driver side pointer weight is 7.70 lbs. (user up to 6500 rpm)
(pulley bolt pattern not specified)

Pioneer $209.97 PIO-872037 SFI 18.1 7.240”internal balance nodular iron/elastomer or steel?
(lists both on page) weight is 9.40 lbs
(pulley bolt pattern not specified)

ATI $339.00 ATI-91747OE SFI 18.1 360 degree markings 7.074” aluminum/elastomer
(pulley bolt pattern not specified)

ATI $329.09 ATI-917400E SFI 18.1 360 7.074” aluminum/elastomer
(pulley bolt pattern not specified)

ATI $329.09 ATI-91828E SFI 18.1 360 degree markings 7.074” steel/elastomer may
(pulley bolt pattern not specified)
require modifications for clearance
3-ring balancer will stick out forward an additional 0.450 in. further than a stock balancer. Hubs should clear most cast in timing tabs. Due to variations over the years grinding, cutting, and welding may be needed for clearance on some applications.

ATI $279.80 ATI-918442E SFI 360 degree markings 7.074” steel/elastomer
supercharged series (no thanks)
(pulley bolt pattern not specified)
Click to expand...

Need to have complete info on your engine build. I would then make a recommendation based on how much performance you may have built into it. 65' .
 
Either the fluidamper (guy right here on FABO has one for sale for a dope price...that's me trying to be cool and hip...how'd I do????) or an Innovaters West.

Chrysler spent a bunch of money researching dampers and they found the FD to be the best. I'm not a fan of rubber band dampers. They are great for OE stuff because they are cheap to manufacture and will work well enough to do the job. When the power level goes up, or you just want insurance, the elastomer style damper isn't that good.


Yes, I know all the heroes use an ATI but those are custom built, one off parts that you and I will never be able to buy.
 
dibbons said:
Is the Pioneer steel? (Summit listing was confusing-depending on what section/page I was reading)

How is the Pioneer marked for degrees? Pulley bolt pattern standard or offset? Thank you.
Click to expand...
Yes steel
Yes marked in degrees
Yes standard pulleys.

Bought one years ago, still running it.
Getting ready to buy another one for my next engine.
 

International shipping is becoming more and more un-affordable. Shipping to Mexico for a balancer is running $70.00. Guess I will just take one off the 318 motor I have here at home and call it a day.
 
That first Jegs SFI one looks pretty good. I would stick with SFI, since you intend on some track usage. JMO
 
The old CAT fluid damper was a tank, the newer one with the recessed bolt pad didnt foul your pulley offset, and they were cheap but looked very nice. I also had the PRO-RACE model that looked very well built.
 
Geez don't over analyze this... all you need is a decent quality replacement...you don't need an ATI, Fluidamper, SFI or anything like that... I've used Pioneer brand for several builds. I have a Fluidamper for my race engine but only because it came with it... go to your local Autozone and make it ez on yourself.
 
Last edited:
dibbons said:
Do the factory original dampers have a part number stamped on them somewhere?
Click to expand...
there is a number cast in, like 3614369 = 1972-1977 318 and 1972 340 with steel crank

DSCF0180.JPG
 
I'e been running a pioneer steel balancer for 15 yrs, probably will step up to the sfi version when I replace it soon.
However the stock replace has been just fine all these yrs.

Keep in mind i've run it on a 400 hp 340 and a lil ole 410 thats north of 500 by a decent amount.
 
When these question come up, I wonder at how all those tens of millions of standard dampers ran and rarely had problems. The big enemy of the stock ones is just the deterioration of the rubber... or chinese made replacements. That is all that worries me on new ones; the cheap manufacturers don't seem to understand or care to match the rubber durometer on a lot of rubber replacement parts.
 
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