1960 Tail Pipe Through-the-Bumper Insulator Screws

[Joe M.]

Can someone look up a screw with part number 156253. I would like to know if the original screws were countersunk phillips or slot. I would guess that all of them have been replaced by now and the screws in the bumper now are probably not original. Judges look for countersunk slot heads.

[Gary C.]

Re: 1960 Tail Pipe Through-the-Bumper Insulator Screws

Joe,

P&A 24 March 1970 shows 156253 as a 1/4-20 x 3/4" long CAD/Zinc with CR (cross recess) head.

Didn't find any earlier reference in P&A books.

Gary
....

[Joe M.]

Re: 1960 Tail Pipe Through-the-Bumper Insulator Screws

That is enough evidence for me to conclude that cross head (phillips) are original. For flight judging, they have to be slot head. Thank you for the info Gary.

[Thomas H.]

Re: 1960 Tail Pipe Through-the-Bumper Insulator Screws

Joe,

My car has phillips head screws. Upon closer inspection there also appears to be an external tooth style lockwasher under the screw head. I don't think these bumpers have ever been off the car but I can't say for sure.

I'm going to a flight judging event tomorrow (as a spectator) and I'll scope out the C1's there. You have piqued my interest......

TomPA201836.jpg

edit: Just read judging manual, calls for slotted like you say. I suppose the insulators on my car could have been replaced at some point, but given the shape they are in, I thought they may have been the originals. I have a pile of old receipts for the car. Maybe one of the ones I could not identify the P/N on was for replacement exhaust insulators. Time to start digging...........

[Joe M.]

Re: 1960 Tail Pipe Through-the-Bumper Insulator Screws

1960 AIM doesn't show an external star washer and I wouldn't think it would be needed since there is lock washer on the other side.

[Thomas H.]

Re: 1960 Tail Pipe Through-the-Bumper Insulator Screws

Yeah Joe, I thought that was unusual when I saw it. I believe the exhaust was replaced in the early 70's and maybe the insulators were replaced then. I need to go through the receipts and see what I can find. Either way, the screws / insulators are most likely not the originals.

Tom

[Thomas H.]

Re: 1960 Tail Pipe Through-the-Bumper Insulator Screws

Went to the judging event at County Corvette in West Chester PA today and there was only 1 58-60 car there (several other C1's though). It had the phillips screws. I did not get a chance to ask the owner how it judged.

I believe they had over 40 cars there today. Nice turn out.

Tom

[Tom B.]

Re: 1960 Tail Pipe Through-the-Bumper Insulator Screws

Here's my original '59s. Never been apart with the original insulators still intact. I have owned this car well over 40 years. They are Phillips.

Tom

[Bill M.]

Re: 1960 Tail Pipe Through-the-Bumper Insulator Screws

Here's my original '59s. Never been apart with the original insulators still intact. I have owned this car well over 40 years. They are Phillips.

Tom

My '59 has phillips (cross-recess) too; mine is a one-family car and I disassembled the original insulators last winter (the cad plating is long gone.)

[Joe M.]

Re: 1960 Tail Pipe Through-the-Bumper Insulator Screws

The evidence is overwhelming that the cross head, recessed were original, but at least two NCRS judges did not agree. A year ago, different judges did not indicate that cross recessed were incorrect. The good news regarding Flight judging is that the majority of the judges agree on the big point items, but not always on little details like cross head vs. slot head, coil capacitor mounted above or below the coil bracket.