harmonic balancer ID
My 66 300HP has a 6 1/8" X 3/4" balancer with the #3883__5 the 5th and 6th numbers are obscured by a bolt hole, the 6th number looks to be a 5 or 6. Does anyone know if this is the correct balancer for this engine?
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Re: harmonic balancer ID
Bob------
Well, I can tell you this: the original balancer for your engine was supposed to be GM #3883204. I can't see any way to get 3883204 out of "3883__5 with a possible 6th digit of 5 or 6.
The balancer for 1966 283 applications was GM #3883956. Both balancers are the same OD and thickness. So, if the last digit seen on your balancer is actually a "6" and not a "5", I'd say the balancer you have is a 3883956. If you're sure it's a "5", then I'd say it's probably some PRODUCTION-only part number (POSSIBLY 3883955) and likely original to your engine.
By the way, you are talking about a number STAMPED on the face of the balancer and not a casting number seen on the rear of the hub section of the balancer, aren't you?In Appreciation of John Hinckley -
Re: harmonic balancer ID
Joe
No, the numbers are on the rear. The only ones I see on the front are
F D 6
Thanks
BobComment
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Re: harmonic balancer ID
Bob------
The numbers on the rear of the balancer hub are casting numbers for the hub section. I believe several different balancers were manufactured with the same hub, so you can't ID a balancer from these numbers.
I suspect your balancer is original.In Appreciation of John HinckleyComment
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Re: harmonic balancer ID
Bob,
Your balancer sounds like it's an original dated "F D 6" where "D 6" = April 1966.
I once owned an original balancer stamped "E 6 F" ("E 6" = May 1966) from an original 1966 Chevrolet 327 engine. I'm not sure the meaning of the letter "F" (possibly the vendor). See link below.
Dave
https://www.forums.ncrs.org/showthre...=2725#poststopComment
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Re: harmonic balancer ID
If this helps, pics of my 67, 300.
The 388# is on the back of the balancer.
FA7 is on the front (build date).Comment
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Re: harmonic balancer ID
Bill------
Yes, this number on the rear of the hub is a casting number for the hub section of the balancer. It was very likely used for more than one finished balancer so it cannot, by itself, be used to identify a particular finished balancer.In Appreciation of John HinckleyComment
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Re: harmonic balancer ID
If F A 7 is a date it's probably January 7, 1966, I think F is 1966. On my 67 the stamped #'s are D 7 F so I guess the date is April 7, 1966.
In the last post of this attachment is a picture of the date on my 1967 300hp balancer.
https://www.forums.ncrs.org/showthread.php?t=69629Comment
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Re: harmonic balancer ID
On the "F A 7" stamping the date code is "A 7" or January 1967. The letter "F" might be the vendor.If F A 7 is a date it's probably January 7, 1966, I think F is 1966. On my 67 the stamped #'s are D 7 F so I guess the date is April 7, 1966.
In the last post of this attachment is a picture of the date on my 1967 300hp balancer.
https://www.forums.ncrs.org/showthread.php?t=69629
On the "D 7 F" stamping the date code is "D 7" or April 1967.
My balancer stamped "E 6 F" ("E 6" = May 1966) came off an original May 1966 327 engine.
Refer to the link in my previous post. The letter "F" seems to be common to many of these balancers.
DaveComment
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Re: harmonic balancer ID
Dave, The engine in my 67 is the original and the build date of the car is Sept 23,1966 so could the balancer be dated April 66 and not 67..Comment
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Re: harmonic balancer ID
Your "D7F" is dated April 1967.
The letter "F" is NOT part of the date code. Refer to the link on my 11:08 AM post today (09/05/2011).
Other balancers that I have or once had:
"7704", "B9F" (Feb. 1969)
"4684", "C8F" (March 1968)
"7706", "J8F" (Sept. 1968)
The 3947704, 3914684, and 3947706 balancers did NOT exist in 1966. Isn't it odd that all these balancers have the letter "F"? The letter "F" must be for the vendor.
DaveComment
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Re: harmonic balancer ID
Thanks David,
I find it hard to believe the balancer has been replaced but stamped #'s don't lie..
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