CRG Discussion Forum

Camaro Research Group Discussion => General Discussion => Topic started by: 1MeanBull on February 14, 2020, 09:17:55 PM

Title: HARMONIC BALANCER LARGE BOLT
Post by: 1MeanBull on February 14, 2020, 09:17:55 PM

hi, was wondering if someone might what the correct marking should be on the large harmonic balancer bolt, is it L8, or ROCKFORD, 

Title: Re: HARMONIC BALANCER LARGE BOLT
Post by: x66 714 on February 14, 2020, 10:06:53 PM

Rockford was an aftermarket company. I sold those when I worked at NAPA. I don't think any were used at the engine builders...Joe

Title: Re: HARMONIC BALANCER LARGE BOLT
Post by: 1MeanBull on February 15, 2020, 02:41:42 AM

hey joe, thanks fort the info.

Title: Re: HARMONIC BALANCER LARGE BOLT
Post by: 1MeanBull on February 15, 2020, 02:43:08 AM

should of mention its for a 69 Z/28 302 I was referring to.

Title: Re: HARMONIC BALANCER LARGE BOLT
Post by: z28z11 on February 15, 2020, 02:58:25 AM

Here you go - marked "TR", thick washer, thin star washer - bolt was drilled for safety wire retention. They are a little hard to find nowadays,, but do pop up occasionally. Keep your eyes peeled -

Regards,
Steve

Title: Re: HARMONIC BALANCER LARGE BOLT
Post by: TODD on February 16, 2020, 02:11:02 PM

This guy on ebay sells all styles
https://www.ebay.com/itm/HARMONIC-BALANCER-BOLT-SB-CHEVY-OEM/174122689924?hash=item288a856584:g:BgoAAOSwr05d8SOY

TODD

Title: Re: HARMONIC BALANCER LARGE BOLT
Post by: Daytona Z on February 18, 2020, 02:03:20 PM

Just out of curiosity, what did the center bolt wire across to as is the only bolt I see drilled out of the 4 on the lower pulley?

Title: Re: HARMONIC BALANCER LARGE BOLT
Post by: BillOhio on February 18, 2020, 02:54:15 PM

I wondered what it wired to also. Mine is drilled

Title: Re: HARMONIC BALANCER LARGE BOLT
Post by: Edgemontvillage on February 18, 2020, 04:01:05 PM

The original assemblies I have seen consist of a grade 8 bolt that is clear zinc plated, typically with a TR head marking, and a single through-hole in the bolt head, followed by a star washer also clear zinc plated, then a special thick washer that is natural steel (unpainted and unplated). The 3 bolts that hold the crankshaft pulley to the balancer are manganese phosphated.

Title: Re: HARMONIC BALANCER LARGE BOLT
Post by: z28z11 on February 19, 2020, 04:27:13 AM

Quote from: GreenNV on February 18, 2020, 02:03:20 PM

Just out of curiosity, what did the center bolt wire across to as is the only bolt I see drilled out of the 4 on the lower pulley?

Hate to assume, racing prep might include safety wiring to the other three, after they were either drilled or replaced with drilled bolts. Makes sense -

Steve

Title: Re: HARMONIC BALANCER LARGE BOLT
Post by: Daytona Z on February 20, 2020, 01:45:39 PM

Just seemed odd to me. Center bolt is drilled, but the other three were never drilled from the factory? Like it was being considered at one point, but later abandoned.

One of those things that makes you wonder what was or could have been?  :P