B&H bolt headmark

[Timothy B.]

I have four B&H headmark bolts. They are 5/16" thread and approx 1/2" long with a captured flat washer. I think they are from oil pan installation but I wanted to find out for sure.

Any help is appreciated..

[Domenic T.]

Re: B&H bolt headmark

Tim,
I am dizzy from sorting and cad plating bolts for my 63 & 67.
I have not as yet ran across BH on any heads.

DOM

[Rich P.]

Re: B&H bolt headmark

Tim,

the 4 small block oil pan corner bolts almost always have a captured split ring lock washer not a flat washer. B&H is correct for 63-67's. How big is the flat washer 3/4" If so and the bolts have a flat tip then they were most lokely hood hinge to hood or female hood catch to firewall bolts. These were used in a few other places such as radio to dash bolt and others.

Rich

[Dave S.]

Re: B&H bolt headmark

Tim,

the 4 small block oil pan corner bolts almost always have a captured split ring lock washer not a flat washer. B&H is correct for 63-67's. How big is the flat washer 3/4" If so and the bolts have a flat tip then they were most lokely hood hinge to hood or female hood catch to firewall bolts. These were used in a few other places such as radio to dash bolt and others.

Rich

B & H headmarks were used on C1 wheel cylinders, Big Brake dust covers and early fuel injection fuel filters. I'm sure there are other uses but tese are three possibilities.

[Domenic T.]

Re: B&H bolt headmark

Rich,
If that's right then I will have to dig again thru my bolts of the past for the BH bolt.
I have ( E ) bolts and (anchor ) bolts on the 4 corners of my pans.
I thought they were right as I didn't find any BH bolts in my bolts of the past.

DOM

[Rich P.]

Re: B&H bolt headmark

Tim,

I forgot to say if the washer is smaller and twice as thick as a hood hinge bolt then they could be proportioning valve bracket bolts as well as auto trans pan bolts (some auto trans pan bolts used a captured flat washer instead of a flanged head).


Rich

[Mike M.]

Re: B&H bolt headmark

B & H headmarks were used on C1 wheel cylinders, Big Brake dust covers and early fuel injection fuel filters. I'm sure there are other uses but tese are three possibilities.

dave is correct in that B&H were used on c-1 brake shields, 57-8 FI fuel filter to bracket but these two bolts were fine thread. the wheel cylinders had coarse thread 5/16" B&H's. mike

[John D.]

Re: B&H bolt headmark

As mentioned the 57-58 fuel filter bracket to cannister bolts are B&H fine thread. Recessed hex, captured free spinning split lock washer.
But the SB Chevy B&H bolts have a similiar logo to the FI. The circle around the B&H on real deal big buck FI bolts is touching the B&H where as the course thread oil pan bolts the circle is not close to touching the letters.
Cheater & a shoe maker job for the 57-58 bolts is to take those oil pan, etc bolts that are course thread and run a fine thread die over them. A real bubba job but better than paying 100's of bucks for two bolts.
Never saw the oil pan bolts-one in each corner with a B&H with a flat washer though. They usually have the split locks.
Now I am not really into all the engine details on the midyears but I had no idea that they used B&H bolts in the 4 corners of the pan. Are you guys sure about this??? JD

[Domenic T.]

Re: B&H bolt headmark

John D
I'm with you, I am on my way to my shop to look again at all the bolts of that type that are in the bucket I didn't use.
I don't remember any with that head mark.
I have the bolts to over a dozen engines (most SB) and have not run across the BH.
I saved these for 45 years.

DOM

PS
Tim if they are not the ones let me know I'll see if I have the right ones and send them to you.

[Rich P.]

Re: B&H bolt headmark

Here is a picture of 2 different B&H headmarking bolts removed from small blocks. The first shot is of one of my stashes of small block oil pan corner bolts it is the back row of this bin orginizer, there are easily 1500-2000 bolts in theat one section it is about 4" deep. I pulled out 50 bolts and imediatly found these 2 styles I know I have one or two more different style B&H's in there. I found it interesting that they both hav knurled captured lock washeres, not too many have the knurling. I must have bolts from well over a 1000 small blocks and a many big blocks.

Rich

[Mike B.]

Re: B&H bolt headmark

Hi Tim,

Your 4 B&H bolts sound like the 6 bolts (screw assemblies) that mount the hood hinge to the hood. However, those are 5/16-18 x 5/8", cup head, grade 5, black oxide, blunt tip with captured 3/4" conical washers. I've never seen one 1/2" long. Are you measuring from under the head of the bolt? If you are measuring from the underside of the captive washer, then it would be about 1/2" long.

These 5/8" bolts were part #3846201. See '66~'67 Assembly Instruction Manual UPC 11-13, sheet B6 (hood hinge) and UPC U69, sheet A2 (radio mount), and again in the '67 AIM UPC 5, sheet C1 (parking brake).

I've got numerous other B&H headmark bolts. A little while ago I was sorting timing chain cover/small block oil pan side screws and ran across a few. Numerous examples of small block oil pan corner bolts. I've got many 3/4"~1 1/4" B&H engine mount bolts. Another bolt where you may find the B&H headmark is on the front 4 seat mount bolts. My '65 and '66 had them there. Identical to the aforementioned hood hinge bolts, but 13/16" long.

Maybe one of these days I'll make it to another Mason Dixon event.

Hope this helped you,
Mike

[John D.]

Re: B&H bolt headmark

JD here does not work on engines anymore but used to years ago.
The oil pan bolts I am referring to reportedly came from a Tonawanda engine. Not like the ones in the pics. But meanwhile this post isn't about FI fuel filter bolts anyhow.
But for guys not wanting to pay 350.00 a pair might want to keep an eye out for the ones I described above. You have to change the washer and mess with the threads. installed they are OK but no cigar to guys like Dr. Mike, etc.

[Timothy B.]

Re: B&H bolt headmark

Thanks everyone for responding to my question about the B&H bolts, you guys are great.

These bolts have the 3/4" flat washers like described and after measuring them again they are 5/8" in length from the bolt. I assume these are for hood hinge to hood etc.

My next question is about the years these smooth washer bolts are used. Attached is a picture of a serrated washer short bolt from my 63, these are what I always thought is correct for the hood hinge to hood for 63. I remember my 67 having the smooth washer bolts but all my 63 stuff has serrated washers.

FWIW, in 1963, the female hood catch to firewall are the same as the hood hinge to inner fender and are pointed and approx. 7/8" in length. My memory tells me there are two lengths, one like the lower front shock retainer bolts approx 3/4 and a longer for the hinge to inner fender and female hood catch to firewall but these are all serrated flats and pointed.

Someone correct me if I am wrong but I believe all 63's used serrated washers on the flats weather 7/8", 3/4" or the 5/8" non pointed for the hood hinge to hood.

[Domenic T.]

Re: B&H bolt headmark

Tim,
This is what I took off my 63 coup that has been stored since 1971.

I cad plated it a few mos ago, all 6 have the same head mark.

I spent most of the day sorting thru abour 100lbs of bolts that I put back because of their head mark. I was looking for the B&H head mark and found about a dozen.

I've seen all the others here in the shop but the B&H are rare here.

I think I have RBW, RSC, or anchor bolts on the corners of my pans.
If they are wrong, then your post prompted me to find the right ones.

I owe you a picture of where I took the round plate off my 63 /3:08 rear end. It is still virgin and only has that one bolt out that the plate was under.

DOM

[Timothy B.]

Re: B&H bolt headmark

Dom,

Thanks for the pictures of the 63 parts, I am curious about the use of the serrated washers for 63 that's why I changed the topic and asked a question about the washers.

It's pretty clear the B&H bolts I have with the flat washers are for other applications as mentioned in previous posts, it's the serrated washers on the same type of bolt as shown in my picture that I now question.

I always thought the bolt at the location in your picture has a pointed end and approx 3/4" long. Part # 3789670 is what is called out in the AIM, it's the same bolt as the lower front shock bolt, mine are serrated and pointed.