c-1 1958-62 FI Bolt head questions

[J O.]

What are the bolt head markings on the '58 FI air filter canister to the inner fender bracket ? Are they the same on the '59-62 cars ?
Where do the B & H bolt head's go ? (or don't I need them?)
Thanks.

[Richard T.]

Re: c-1 1958-62 FI Bolt head questions

The b&H bolts (fine thread) attach the F.I. fuel filter to the mounting bracket.

[Mike E.]

Re: c-1 1958-62 FI Bolt head questions

62 has an unusual screw holding the air cleaner to the fenderwell bracket-it is a machine screw (self-tapping) with a pressed-on flat washer, and a dished hex head with an overlapping double "M". Doesn't seem right to be self tapping rather than 1/4-20 or the like, but it is.

[J O.]

Re: c-1 1958-62 FI Bolt head questions+ survey

Thank's Mike,
that sure is weird..(using a self tapping screw there) the catalogs list theair cleaner inner fender bracket for '58-'62 with "weld nuts" attached". for the (1/4 -20 bolts ).but if the '62 takes a screw, then there must be a different bracket ? they don't seem to know the head marking though..i guess i'll use TR bolts. I saw a thread from a few years ago by Richard Brodeur who was doing a book on head markings-bolts.but i can't seem to find anymore on it.
can anyone else out there tell me what head marking bolts their car has holding on their air cleaner to the inner fender bracket?
thanks.
john

[Mike E.]

Re: c-1 1958-62 FI Bolt head questions

That's what has never made sense to me--there is a pair of weld nuts, but the 62 definitely doesn't use a 1/4x20 bolt. The bracket is identical to the earlier cars, although I've never seen a 61-62 with more than one rivet holding the bracket to the inner fender, while I recently documented a February 58 car that has three rivets.

[Lou C.]

Re: c-1 1958-62 FI Bolt head questions

Photo of the BR bolt that attaches the air cleaner to the weld nuts on a 62.

[Lou C.]

Re: c-1 1958-62 FI Bolt head questions

another photo

[John D.]

Re: c-1 1958-62 FI Bolt head questions

What are the bolt head markings on the '58 FI air filter canister to the inner fender bracket ? Are they the same on the '59-62 cars ?
Where do the B & H bolt head's go ? (or don't I need them?)
Thanks.

John, I thought we covered this on the phone!!! The only B&H bolts are for the fuel filter bracket to the cannister of the fuel filter.
Did you pick up an air cleaner yet??? John D.

[Joseph T.]

Re: c-1 1958-62 FI Bolt head questions

John, I thought we covered this on the phone!!! The only B&H bolts are for the fuel filter bracket to the cannister of the fuel filter.
Did you pick up an air cleaner yet??? John D.

B&H bolts were used to attach the RPO 684 dust covers to the vented backing plates, used on oil pans and I believe some seat tracks albeit..only fine thread B&H bolts being used on the 57/58 AC ribbed fuel cannister lid to bracket.

Or so I remember!

[John D.]

Re: c-1 1958-62 FI Bolt head questions

B&H bolts were used to attach the RPO 684 dust covers to the vented backing plates, used on oil pans and I believe some seat tracks albeit..only fine thread B&H bolts being used on the 57/58 AC ribbed fuel cannister lid to bracket.

Or so I remember!

Joe, I agree with you for sure. If a guy can find some of those rare 5/16 course thread oil pan bolts they make for some good cheater bolts for peanuts. I mean the real deal are going for 350 a pair and up. The oil pan bolt B&H logo is pretty close. Only difference on the head markings is that the circle around the B&H is further away from the letters. You just do a bubba job on those bolts and run a 5/16 fine thread die over the course thread bolts. It'll work but is nothing to brag about.
I have spent 1/2 of my 65 years looking for those real deal bolts. I remember 20 years ago they were bringing 50 buks each. John D.

[John N.]

Re: c-1 1958-62 FI Bolt head questions

B&H bolts were used to attach the RPO 684 dust covers to the vented backing plates, used on oil pans and I believe some seat tracks albeit..only fine thread B&H bolts being used on the 57/58 AC ribbed fuel cannister lid to bracket.

Or so I remember!

Also used to attach wheel brake cylinders.
Regards

[J O.]

Re: c-1 1958-62 FI Bolt head questions

John, I thought we covered this on the phone!!! The only B&H bolts are for the fuel filter bracket to the cannister of the fuel filter.
Did you pick up an air cleaner yet??? John D.

no sir. no canister yet..do you have one , cheap?
I'll check on one later this week.

also , i have'nt seen any info on the bolts connecting the ac to the fender...other than the br 's for the '62 car's.. that Mike and Lou said..unless LOU C is saying they also go on the '58-'61's..which I don't think that's what was meant.
john

[John D.]

Re: c-1 1958-62 FI Bolt head questions

no sir. no canister yet..do you have one , cheap?
I'll check on one later this week.

also , i have'nt seen any info on the bolts connecting the ac to the fender...other than the br 's for the '62 car's.. that Mike and Lou said..unless LOU C is saying they also go on the '58-'61's..which I don't think that's what was meant.
john

Check on ebay for an older style repro cannister set up. But be careful as it's a piece of crap. Has a rubber hose in lieu of the filter. It's a fake that was made long ago. If you use it-just for show you will have to mount another filter somewhere else which is a bubba job.
The good repros are history as I believe the fellow who originally made them died. The current repro is lacking a couple of operations which makes it stand out as a repro part period. AT the bottom of the cannister about an inch up from the bottom there is supposed to be an indented groove around the outside. Originally this was done to help hold in the inner lining. Well on the new repro this groove is missing. Also there is a weep hole on the bottom in the center that is missing. They usually run about 600 buks. Maybe some one could post a nice pic here. Roy B did so a while back as I recall. JD

[John H.]

Re: c-1 1958-62 FI Bolt head questions

That's what has never made sense to me--there is a pair of weld nuts, but the 62 definitely doesn't use a 1/4x20 bolt. The bracket is identical to the earlier cars, although I've never seen a 61-62 with more than one rivet holding the bracket to the inner fender, while I recently documented a February 58 car that has three rivets.

Mike -

I think a "Bubba" repair/replacement is being chased here with the thought that it's original; I spent enough years at Chevrolet Engineering to know that there's no way any engineer is going to release a type "AB" self-threading screw (shown in Lou's photos) to be driven into a 1/4"-20 or 1/4"-28 machine-threaded anchor plate. Fastener engineering reviewed every single fastener release, and there's no way that mismatch would fly.

I'm not "up" on that particular attachment, and I'm assuming the hole in the anchor plate is machine-threaded.

[Mike E.]

Re: c-1 1958-62 FI Bolt head questions

John--
I have to disagree with you. Bought my first 62 fuelie in 1974. Took those screws as I described out and tapped the nuts for 1/4x20 because I knew they couldn't be right. Over the last 30 years I've kept my eyes open for original, unmolested 62 fuelies. All had the type I removed initially back in '74.
Doesn't make sense to me, and I didn't want to believe it, but am ABSOLUTELY convinced that that is what GM used at assembly.