352FE Harmonic Balancer question
 

Thought I'd see who wanted to weigh in on this... I'm upgrading my 66' 352 slick to power steering and in doing that will be installing the double belt crank pulley.

Of course the two belt pulley that I have is a three bolt and the original was a 4 bolt. (and my pulley is just back from powder coat so I think I'll keep it.)

Sooo.... I will need to replace the original harmonic balancer. The question....
is there any benefit to buying an aftermarket balancer vs one from the pull yard and if so, can someone recommend a good quality aftermarket one?

thanks as always to the brain trust for always coming up with sage advice.

Jon in Atlanta.

I went through this about a year ago.... here is one of the problems that you face.... After market Pulleys quite often have the right number of bolt holes, but frequently the hole pattern is different. To get an aftermarket Balancer you will end up having to also purchase a matching pulley, I went with a polished aluminum Pulley. it was only $55.. many of the Dampers require replacement of all the pulleys for belt alignment sake.. which can run into the 4 digit pricing range if you want to dress it up.. Your best bet is to search the Dampers on Ebay, there are a few rebuilders that list on there they rebuild the old units with new rubber.... make sure that they do just that.. not just shotpeen it and paint it,,as some if not many do... Yard pulls??? well how long will it last.. there is a viscous rubber membrane between teh inner and outer, and if it has deteriorated it can separate and cause all sorts of hell and destruction on your system... so it is a real crap shoot... I opted for all new with the Warranties, that way if it does go wrong the manufacturer pays the bill or at least you have recourse.... Junk Yard PYP parts ohh too bad! I actually bought a nice damper, and then purchased a Polished Aluminum pulley, then had it drilled at a local machine shop to the proper specs. A bit more pricey, but it is balanced, and much lighter, which frees up Horsepower.

Qwist on a bicycle! You are making a mountain out of an ant hill!

The harmonic balancer you use MUST match the flywheel or there will be a vibration that will eventually tear the center from it. I kid you not!

Where on earth will you find the CORRECT FE harmonic balancer that matches your engine that has a two sheave pulley made as part of it...since there's no such thing.

C3AZ-6312-E (replaced COAE-6312-B) .. 1960/67 352/390/410/428 Harmonic Balancer-Includes a single sheave pulley / Marked: C4AE-6316-A or C4AE-6316-B

This is so simple a cave man can do it. All you have to do is bolt an ACCESSORY OUTER pulley to your present harmonic balancer. This is correct FoMoCo procedure.

Since it already has one sheave pulley, you will either need a single or double sheave outer pulley. BUT, first...what you need to find out is...if your present balancer is the original, or from a 1968/76.

I'm not sure if the C3AZ-6312-E balancer has three or four holes to mount accessory outer pulleys.

Nor can I recall how many holes D5TZ-6316-A (replaced C8AZ-6316-A & D2TZ-6316-A) 1968/76 360/390 balancer has.

But...I think 1960/67 has THREE holes, 1968/76 has FOUR, but like I said, I'm not sure and haven't seen any since the 1980's.

I am pretty sure the 68-76 has 3. I don't remember how many my '66 has. I will check in the morning to make sure.

My old "67" was a single sheave 3 hole with a 3 sheave pulley. and the new one that I bought is also the 3 hole, I have a 2 sheave Aluminum pulley bolted on to it. Yes you need to have the balancer matched to the Flywheel.

1960/67 352/390/410/428 Accessory Outer Pulleys-Use with C3AZ-6312-E Harmonic Balancer

C1AZ-6A312-B .. Single Sheave Outer Pulley / Obsolete / 14 available NOS

C1AZ-6A312-D .. Single Sheave Outer Pulley / Obsolete / 5 available NOS

COAZ-6A312-A .. Double Sheave Outer Pulley / Obsolete / 3 available NOS

C1AZ-6A312-C .. Double Sheave Outer Pulley / Obsolete / 1 available NOS

C4AZ-6A312-B .. Triple Sheave Outer Pulley / Obsolete / 1 available NOS

C4SZ-6A312-B .. Triple Sheave Outer Pulley / Obsolete / 8 available NOS

found a pulley at the yard which is a C8AE-6312-C - double sheave from a '68. (also pulled the PS brackets and pump) Internet recon says it's for a 360. Pardon the rookie question but just seeking reassurance from wiser minds, Since I got the pulley and the PS brackets I shouldn't have a problem with fitment on my 352 right?

Post #4: You were supposed the "check in the morning" to verify how many mounting holes your harmonic balancer has for an outer pulley, then post the info here. Guess you forgot.

If a 1968/71 (1968/76) 4 mounting hole outer pulley will bolt to your harmonic balancer, either the engine has been swapped or someone installed a 1968/76 balancer.

Not sure if it's as much about the number of mounting holes as is the dia. of the 3 hole pattern. Seem to recall searching for a 2-3 sheeve pulley for the 65 390 I salvaged a couple from donor only to get home to find the hole pattern was too large; although, not the first time got home after a 'pic n pull' salvage shopping spree only to find it was not the correct donor part.

I dunno how it could be possible to mount a 1968/76 4 hole outer accessory FE pulley to a 1960/67 FE harmonic balancer, since it only has 3 mounting holes.

If the outer pulley you bought wouldn't fit, it wasn't for 1960/67 FE engine. There were six different outer pulleys used 1960/67, all these puppies are listed in post 6.

The reason for the duplicates has to do with O/A diameters, sheave widths.

Sorry, was referring to a 3 hole pulley that mounts to the balancer. Do all 3 hole pulleys have the same dia. hole pattern, because I do have 2-3 hole pulley where the hole pattern is slightly larger than the hole pattern on the ballancer.

Look on the pulley for its stamped ID number, post what it is.

There are about 100 outer pulleys used on myriad 1960/70's engines. I'd have to look up every engine family, then see how many bolts are required to mount the outer pulleys to the balancer.

That's waaay above and beyond "the call of duty."

clear as mud. Sorry for any confusion, My 2 toddlers have turned my brain to mush.

Existing pulley was a single sheave, three bolt crank pulley off of my '66 352.
Replacement pulley is a two sheave, three bolt crank pulley off of a '68 360. (C8AE-6312-C stamped on it )

If purchased would be interested whether or not it fit, if not yet suggest measure existing bolt pattern and compare to replacement. With my experience, the difference was so small I was almost tempted enlarging existing holes.

THREE bolt 1968? hmmm...that's a new one on me. Does the bolt circle pattern match the single sheave outer pulley?