67 rear bumper bolts

[Michael H.]

Re: 67 rear bumper bolts

Mike,

I think it will depend on the judge, and the year. As an example, say on a '63 thru '66, if all the bumper nuts on the car are 11/16" across the flats (instead of the correct 5/8" ATF, except for qty=4), what would you do if you were a chassis judge? On the front and rear combined that comes to 26 incorrect nuts. Would you make a note on the judging sheet, but take no deduct? Or take a 1-pt deduct for the front/back combined?

Gary

Gary,

I don't think most judges will be measuring nuts since the deduct is so minor for the points given for all of the braces and hardware. Front and rear bumpers are two different line items under Exterior. I would just note it and not deduct any points unless there are some other issues such as rust, pitting, extra holes, repairs, wrong braces, etc.

Mike

[David B.]

Re: 67 rear bumper bolts

Peter,

Yes, I recall some are 1" and some are 1.5" long..

Gary

122267 is 7/16-14 x 1 1/4" zinc
122293 is 7/16-14 x 1 3/4" zinc

[Gary B.]

Re: 67 rear bumper bolts

I stand corrected. I should have measured and not guessed.

Gary

[Gene M.]

Re: 67 rear bumper bolts

Gene,

The 5/8" across the flats (ATF) bumper nuts in zinc persisted into the early part of the '67 model year, to be replaced by the 11/16" ATF black phosphate nuts, which were in fact the exact same 11/16" ATF nuts used at four locations on the large, front ,two center bumper braces that were used since '63.
Gary

Yes, it is not uncommon to have very early ‘67 with the older version on one end of the car and the revised version on the other. My very early ‘67 was as such. At first when disassembling it I was befuddled with which wrench size I picked up. After closed inspection I realized GM had both 5/8” and 11/16” hex on the 7/16” nut hardware. My opinion is that GM was just being economical and using up what was in stock. Functionally it made no difference.

[Gene M.]

Re: 67 rear bumper bolts

Glenn,

Just FYI rear bumper bolts and braces are only worth 3 points on originality and 3 points on condition for both sides, so that means each side is only worth 1.5 points . So you shouldn't lose any points if you have the wrong bolts especially if you count all the braces, bolts, washers, etc.

The front is worth 4 points for originality and 4 points on condition.

Mike

[Gary B.]

Re: 67 rear bumper bolts

Gene,

What was the build date of your '67?

I bet your '67 also had the rear spring end retainer cups with the shallow lip angle. The early style cups perished into Jan of 1967 on some '67s. Sometimes the rear spring had one style and sometimes the T-arms had the other style.

Gary

[Gene M.]

Re: 67 rear bumper bolts

Gene,

What was the build date of your '67?

I bet your '67 also had the rear spring end retainer cups with the shallow lip angle. The early style cups perished into Jan of 1967 on some '67s. Sometimes the rear spring had one style and sometimes the T-arms had the other style.

Gary

Gary
I’d have to check my records on my findings to be sure as I don’t want to rely on my recollection. But the car is #440 very early. I do recall that one trail arm was drilled for big block sway bar and the other was not.