Hood Pin Questions?

[Steve Wallach]

I have seen several different length hood pins advertised as NOS for Mid Years. On my 67, they seem to be the shorter ones, what are the different lenght hood pins for(different years?)

I have a NOS set with the "A" stamped at the bottom and about 1 1/4 inch of threads. GM number 3782560. I believe these are "Correct" for my 67.

Thanks for any input and clarification,

Steve

[Joe L.]

Re: Hood Pin Questions?

Steve----

GM #3782560 was used for all 1963-67 Corvettes (and, 61-62, also). It is 3-3/4" long from end-to-end.

[Steve Wallach]

Re: Hood Pin Questions?

thanks Joe,

the ones I just got, have a slight Yellow tint, and were still in the boxes.

Steve

[John D.]

Re: Hood Pin Questions?

Joe, The 3782560 hoose pin is the service replacement and is 3-3/4" long. It was never used in production. It's too long and must be shortened. In fact here is what happened me me this past year. I had a pair of the 3782560 hood pins for an eon in the blue boxes. Well they are too long for sure. If I had used them on my 63 they will have poked a hole in the upper hood surface if snugged up too much.
The orignals OEM ones are slightly shorter and configured a little different that the SR's.(service replacement). One more thing is that when I took these out of the boxes I said out loud that they were just one more part that probably came from another application and was pushed onto the Corvette line.
In fact Michael Hanson and I were emailing about this very part this past year.
He said it's another part that was only used in St. Louis and not over the counter. Sorta like the mystery FI distributor oil line from 58 to 65 that we cannot find the part number for. Production part numbers again. Thanks, John

[Joe L.]

Re: Hood Pin Questions?

John------

Yes, apparently, GM #3685619 was used in PRODUCTION and it was never a SERVICE-available part number. While it was never available in SERVICE, the GM #3685619 was not a Corvette-specific part. It dates back a long while before the very first Corvette was built in 1953.

The GM #3782560 was the only part ever available in SERVICE from GM for 61-67 Corvettes.

It does seem strange to me, though, that GM would only have supplied a part which required cutting to be used in the application for which it was cataloged. The only other fastener that I can think of that was supplied in SERVICE and required cutting is the air cleaner stud. However, cutting a 1/4" stud is a lot different than cutting a 1/2" bolt.

[Steve Wallach]

Re: Hood Pin Questions?

Ok,

So I'm confused? The 3782560 NOS part in the GM boxes with the "A" stamp at the bottom of the bolt still needs to be cut?

This matches what is currently on my 67. The longer bolts I have seen (I actually have one in the box also) are about an inch longer? (Maybe not for a Corvette?)

The 3782560 seems to fit into the hood ok, and I'm not sure that it would hit on anything under the catches in the Engine Compartment. Am I ok, or will I have problems using these? (3782560)

Thanks Again,

Steve

[Joe L.]

Re: Hood Pin Questions?

Steve-----

I don't know. I thought that the 3782560 should work right out of the box. As I mentioned, it would surprise me if GM supplied a part, especially right from the beginning, that required being cut to work for the cataloged application. I only suggested the possible need to cut it based upon what John D had reported.

If you have the original bolts from your 67, how do they compare in length with the NOS GM #3782560 that you have?

[Frank C.]

Re: Hood Pin Questions?

Joe and all I have 6 new 3782560 pins I got from the general in the late '70s. I finally remembered to meaure the length today and measures 3 9/16" end to end. Are these shorter than what is currently available? I forgot to see if they have the "A" stamping on the end.

[Joe L.]

Re: Hood Pin Questions?

Frank-----

The GM specification for the GM #3782560 bolts is that they are 3-3/4" in overall length. That has always been the spec for the 3782560 since the time of their original release in 1961. However, as I've mentioned before, sometimes the GM specs "are not consistent with reality". This happens for a variety of reasons I'll not get into here. In any event, I do expect that the 3782560 bolts were the same length throughout their period of manufacture. They are no longer available from GM, though.

The real question is just how does the GM #3782560 bolt, which was available and used in SERVICE only, compare to the GM #3685619 bolt used in PRODUCTION for 61-66 Corvettes but never available in SERVICE.