Author Topic: 1969 Z/28 spare tire hook size?  (Read 5542 times)

ZLP955

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Re: 1969 Z/28 spare tire hook size?
« Reply #30 on: June 08, 2017, 09:44:10 PM »
In response to Austin's questions, I measured the diameter of my original hook the other day and got slightly over 0.30"  (measured 0.305 with a vernier caliper)...
Gary was that on the threaded or threaded section? I didn't try to measure that aspect accurately, just used the rule shown in the picture above and got ~1/4".
Tim in Australia.
1969 04A Van Nuys Z/28. Cortez Silver, Dark Blue interior, VE3 bumper, Z21, Z23, D55/U17, D80, flat hood.
Sold at Clippinger Chevrolet in Covina, CA. Ex-E/MP at Lions Dragstrip in Long Beach.

bcmiller

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Re: 1969 Z/28 spare tire hook size?
« Reply #31 on: June 08, 2017, 10:37:10 PM »
My hook that Tim mentioned on EBay arrived today. 9.88 inches total length, 5.32 inches threaded, width of hook 2.19 inches, diameter varies from 0.272 to 0.278 inches. Not the same as original - but for me, it will work. :)
« Last Edit: June 09, 2017, 02:14:04 PM by bcmiller »
Bryon / 1968 Camaro SS 396 coupe - now 468 cubic inch BBC/M21
1967 RS/SS 396 coupe L35/M40 - 4 generation family project
Looking for 68 Camaro with body # NOR 181016

69Z28-RS

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Re: 1969 Z/28 spare tire hook size?
« Reply #32 on: June 09, 2017, 04:50:34 AM »
In response to Austin's questions, I measured the diameter of my original hook the other day and got slightly over 0.30"  (measured 0.305 with a vernier caliper)...
Gary was that on the threaded or threaded section? I didn't try to measure that aspect accurately, just used the rule shown in the picture above and got ~1/4".

I mic'ed the shaft in a part that was UNthreaded...  The shaft 'seemed' visually to be the same diameter everywhere, and I only measured at one location.
Gary W / 09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe, '70 Mach I 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan

KurtS

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Re: 1969 Z/28 spare tire hook size?
« Reply #33 on: March 19, 2018, 05:37:08 AM »
I looked at the print for 3949607 Spare Wheel Bolt (UPC 10, page A2) the other day.
Overall length was about 9.4" (it's measured to the radius, hence not exact). 8.36" from the hook side to the end. About 2.1" hook width.
5/16-18 threads. Zinc plate, with optional hot galvanize or phosphate.
Kurt S
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69Z28-RS

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Re: 1969 Z/28 spare tire hook size?
« Reply #34 on: March 19, 2018, 12:58:06 PM »
Quote
The only reason I might guess about would be the wider/larger wheel (15x7) which might require a longer hook... ?

Looking a CBTN, the offset for the 69 Z28 15" wheel is .30" and the offset for the other wheels is anywhere from .26" to .50" (depending on the wheel). Since the 15" wheel is actually less than most of the others there would be no reason to use a different hook for the Z28.

Ed

Ed, 'offset' is measured from the CENTER of the wheel, so one would add (or subtract) the offset from  (1/2 the wheel width +1/2") to get the 'offset from the front or back of the wheel.   So a 7" wide wheel would require a longer bolt than a 6" wheel (with the same offset).
Gary W / 09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe, '70 Mach I 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan

KurtS

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Re: 1969 Z/28 spare tire hook size?
« Reply #35 on: March 19, 2018, 09:04:51 PM »
You're only talking 1/2" difference...
Kurt S
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z28z11

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Re: 1969 Z/28 spare tire hook size?
« Reply #36 on: March 20, 2018, 04:27:39 AM »
As usual, the thread got the best of me - I had to go dig out the hook from the Z - looks to be slightly shorter than the other examples from 2017, maybe .250 ? Held the YH spare in the trunk since I bought the car in '73, would bet it's original - opinions ?

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