Author Topic: HARMONIC BALANCER LARGE BOLT  (Read 562 times)

1MeanBull

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HARMONIC BALANCER LARGE BOLT
« 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, 

x66 714

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Re: HARMONIC BALANCER LARGE BOLT
« Reply #1 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
See America's First, Chevrolet

1968 Z/28 Corvette Bronze. Black Hounds Tooth. 02E Los Angeles born 3/13/1968 pnt OO. Purchased March 1976
1969 SS396 Yellow/Yellow 08E Norwood born 8/28/1969 pnt 76E. Purchased April 1981

1MeanBull

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Re: HARMONIC BALANCER LARGE BOLT
« Reply #2 on: February 15, 2020, 02:41:42 AM »
hey joe, thanks fort the info.

1MeanBull

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Re: HARMONIC BALANCER LARGE BOLT
« Reply #3 on: February 15, 2020, 02:43:08 AM »
should of mention its for a 69 Z/28 302 I was referring to.

z28z11

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Re: HARMONIC BALANCER LARGE BOLT
« Reply #4 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
1968 Z28 M21/U17 BRG/W
1969 Z28 X77/M20/VE3 LeMans/W
1969 L78 X66/N66 Cortez/BVT
1969 Z11 L48/M35/C60/C06  1949 3100 5wd 235/6

TODD

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GreenNV

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Re: HARMONIC BALANCER LARGE BOLT
« Reply #6 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?
Just an obsessive-compulsive first gen car guy...

1969 Lemans Blue Z/28 - Factory Original 10E Car

BillOhio

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Re: HARMONIC BALANCER LARGE BOLT
« Reply #7 on: February 18, 2020, 02:54:15 PM »
I wondered what it wired to also. Mine is drilled
1969 Z28, Burgandy, numbers matching, 12,900 miles
1968 RS 327 4 speed
1967 Plymouth GTX Hemi, 4 speed, dana
1961 Chrysler 300G convertible

Edgemontvillage

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Re: HARMONIC BALANCER LARGE BOLT
« Reply #8 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.

z28z11

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Re: HARMONIC BALANCER LARGE BOLT
« Reply #9 on: February 19, 2020, 04:27:13 AM »
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
1968 Z28 M21/U17 BRG/W
1969 Z28 X77/M20/VE3 LeMans/W
1969 L78 X66/N66 Cortez/BVT
1969 Z11 L48/M35/C60/C06  1949 3100 5wd 235/6

GreenNV

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Re: HARMONIC BALANCER LARGE BOLT
« Reply #10 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
Just an obsessive-compulsive first gen car guy...

1969 Lemans Blue Z/28 - Factory Original 10E Car

 

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