'65-6 Spark Plug Heat Shield (barrel) bolts

[Wayne M.]

Recent Corvette Central eBay posting for these bolts ('L' headmark, captured lock washer; 12 external teeth) got me to looking at a partial set that I acquired (also off eBay).

CC link: http://cgi.ebay.com/ebaymotors/1965-...1%7C240%3A1318

The '65 TIM&JG doesn't get into detail about these bolts; the '65 AIM (UPC L78) shows a separate washer.

I only got 5 bolts (of the type shown on left) along with 7 barrels; I found two more 'ELH's in my "stash", but noticed that there are only two rings around the letters, instead of 4 rings on the ones that came with the eBay barrels. Also there are 8 teeth on the left bolt and 11 on my 2-ring example.

About the barrels: they correspond to # 3871266 (see Noland's Vol 2, pg 285) except they are not zinc plated. [I stripped the black paint off part of one [see pic foreground] and it appears plain carbon steel underneath]. The barrels appear to have been dipped (not brushed or sprayed). I'm guessing they might be '65-6 BB passenger -- although the P&A catalogs don't differentiate from Corvette. One other difference is the slot on the tab that secures the barrel to the cylinder head. Noland's GM dwg. shows a hole on the '266' barrel. Another (earlier ?) barrel dwg # 3868828; Noland, same pg. (a 2_1/2" long barrel as opposed to 3.0" for the '266') shows the slot.

So what do judges look for ? (headmark; washer]. On the barrel (slot tab or hole tab) [let's leave the barrel finish for another time ].

[Donald S.]

Re: '65-6 Spark Plug Heat Shield (barrel) bolts

hi wayne i cant help with the barrels but all 8 of my bolts are EL with 2 rings and i believe 11 points on the captured washer i took these out of my 208 heads before they went to the machine shop.. and wayne i will look you up after christmas Don...

[John M.]

Re: '65-6 Spark Plug Heat Shield (barrel) bolts

I have 1966 heads at the shop with original B+H bolts with star washers, I have had three of four sets with B+H, they have a very thin head....Thanks JOHN

[Michael H.]

Re: '65-6 Spark Plug Heat Shield (barrel) bolts

About the barrels: they correspond to # 3871266 (see Noland's Vol 2, pg 285) except they are not zinc plated. [I stripped the black paint off part of one [see pic foreground] and it appears plain carbon steel underneath]. The barrels appear to have been dipped (not brushed or sprayed). I'm guessing they might be '65-6 BB passenger -- although the P&A catalogs don't differentiate from Corvette. One other difference is the slot on the tab that secures the barrel to the cylinder head. Noland's GM dwg. shows a hole on the '266' barrel. Another (earlier ?) barrel dwg # 3868828; Noland, same pg. (a 2_1/2" long barrel as opposed to 3.0" for the '266') shows the slot.

].

Wayne... I think I have one NOS 3871266 barrell. (here somewhere) It has a slot instead of a hole and it looks like it's zinc plated.

The 3868xxx number that's in the 65 AIM was also in the 66 AIM but changed to the 3871266 in early 66 production.

My old 65 396 had a variety of barrels. Some with holes and some with slots.

The shields on my 66 all have slots. No flat washer but I don't know if that's the way it was when new.

[Tom D.]

Re: '65-6 Spark Plug Heat Shield (barrel) bolts

Is group 2.251 PN 3933122 a later serv. number for the shields?

Thanks
td

[Bob J.]

Re: '65-6 Spark Plug Heat Shield (barrel) bolts

Wayne... I think I have one NOS 3871266 barrell. (here somewhere) It has a slot instead of a hole and it looks like it's zinc plated

I think all of those barrels were plated from GM.
I bought many of them both used and new (slotted and with hole) from Smokey Yunick's estate and everyone was plated. Even the mystery motor barrels were plated also. Bob

[Michael H.]

Re: '65-6 Spark Plug Heat Shield (barrel) bolts

I think all of those barrels were plated from GM.
I bought many of them both used and new (slotted and with hole) from Smokey Yunick's estate and everyone was plated. Even the mystery motor barrels were plated also. Bob

Yup, I agree. Every one I've ever seen appeared to be plated.

Do you have any info on the original bolts?

[Bob J.]

Re: '65-6 Spark Plug Heat Shield (barrel) bolts

I think the ones I've removed were ELH but I'll need to go pull some out to count the radial lines on them.

I've removed a few sets of those shields from untouched cars through the years and in my small sampling they've had very thin flat washers between the bolt and shield. Bob