Dating on finned balancers

[Mike E.]

Looking at finned balancers that I've had in a box for a while. Found what I expected; H61 and B62. Also found a big surprise: 9 61. I have to admit I've not studied these much. I only recall noticing letters denoting the month, not numerals. What have you guys seen?

[Wayne M.]

Re: Dating on finned balancers

Mike -- I have H64 on my finned balancer on my early '65 L76.

[Joe M.]

Re: Dating on finned balancers

I seem to recall seeing two different balancers each with a different 'part number' cast or stamped. If indeed threre are two part numbers that might explain the alpha vs numeric month designation????????

[Bruce B.]

Re: Dating on finned balancers

Mike,
I have one here dated G63, part number 3817173.
I think I have another one out in the garage, I,ll check the date and P.N. tomorrow.

[Joe L.]

Re: Dating on finned balancers

All-----


There actually was another part number for the 8" 327 SHP balancer. It was used for all or part of the 1966 model year. It was GM #3883961. It was discontinued from SERVICE in March, 1966 and replaced by the 3817173 which had been used for 1962-65.

I can't find a predecessor part number to the 3817173 for the 1962 model year but it's possible there was one. The 3817173 looks like a number that MIGHT not have been around at the beginning of that model year.

[Tim S.]

Re: Dating on finned balancers

Mike -- I have H64 on my finned balancer on my early '65 L76.

I have a M64 on my Jan 65 bulit L76. Was just looking at it when I changed camshafts in the car and neglected to take a pic of it.

[Bruce B.]

Re: Dating on finned balancers

My other finned balancer is the same PN 3817173 dated F66.

[Mike E.]

Re: Dating on finned balancers

Any others? Has no 62 340 or 360 hp owner on the forum ever noticed?

[Bruce B.]

Re: Dating on finned balancers

Mike I have never had the engine out of my 62 and do not know the date stamped on mine.
I did a Ebay search and found the following finned balancer date stamps;
F63
B65
E95
A66
No 62 dates.

[Joe M.]

Re: Dating on finned balancers

I remember looking for 173 balancer for my 63 and instead came across a different number finned balancer. I'll check the number but it is likely the 961 balancer.
Can the number/date be seen from the back or is it on the front?

[Bruce B.]

Re: Dating on finned balancers

Joe,
One of mine dated G63 is stamped on the back surface.

[Larry C.]

Re: Dating on finned balancers

Hey, Mike,

Not sure if this will help or not but back in 1988, I bought a used 8" balancer at a swap meet so can't know what engine it came off of. Front side has 173 (assume last 3 digits of 3817173) stamped near outer edge and F1 6.2 cast into backside of one of the three spokes, for lack of better term. Looks like one other spoke has a 2 and a 0 cast on it, but the letters are very faint.

My '62 340 engine is still assembled in the car so I can't get you any info on it unless I pull it for a rebuild.

Larry

[Lou C.]

Re: Dating on finned balancers

Mike, I have a K61 on a Jan. car.
Lou