1966 caliper mounting bolt head markings

[Keith M.]

need some help...have a 1966 and would like to know what the correct caliper mounting bolt head markings are...I assume they were all grade 8...and I assume the fronts are threaded all the way and rears have shank and all bolts would use lock washers...thanks as I am trying to make sure all my hardware is correct and I have the judging manual and it dosent specify....thanks again

[Joe L.]

Re: 1966 caliper mounting bolt head markings

need some help...have a 1966 and would like to know what the correct caliper mounting bolt head markings are...I assume they were all grade 8...and I assume the fronts are threaded all the way and rears have shank and all bolts would use lock washers...thanks as I am trying to make sure all my hardware is correct and I have the judging manual and it dosent specify....thanks again

Keith-------


The bolts have a raised perimeter on the head, 6 radial lines extending from the raised perimeter to the "O" in the center. The configuration is the same for both front and rear bolts. However, the front bolts were 1-1/4" long whereas the rears were 1-1/8" in length. The fronts have a short unthreaded shank; the rears are all thread.

A thick split lockwasher was used with all bolts.

[Keith M.]

Re: 1966 caliper mounting bolt head markings

thank you for your help

[Wayne M.]

Re: 1966 caliper mounting bolt head markings

Here's the bolt heads on the rear caliper.



c

[Jim S.]

Re: 1966 caliper mounting bolt head markings

Wayne, I think Keith was asking about the mounting bolts. You don't have those pictured ;-)

[Wayne M.]

Re: 1966 caliper mounting bolt head markings

.....A thick split lockwasher was used with all bolts.

Joe, Keith --- I don't recall ever seeing a split lockwasher, fronts or rears. Also the exploded view in the Shop manuals and the P&A parts books show no washer.

[Wayne M.]

Re: 1966 caliper mounting bolt head markings

Sorry -- thought the subject was caliper half bolts. Too early in the morning out here .

Just checked and I agree with the 6 radial lines.

[Joe L.]

Re: 1966 caliper mounting bolt head markings

Sorry -- thought the subject was caliper half bolts. Too early in the morning out here .

Just checked and I agree with the 6 radial lines.

Wayne------


The caliper half bolts used for 1965-E67 were PLACE bolts as you have pictured. This type of bolt has an inherent locking capability; that's the only reason for using place bolts. Strangely, the L67-82 bolts were just conventional hex head bolts and no lock washer was used. So, I guess for 1965-E67 1st design calipers GM thought that thread locking was important (place bolts are expensive; in fact, far more expensive than a plain bolt with a lock washer). However, for 2nd design L67-82, they apparently reconsidered and felt that NO thread locking was needed.

[Rich P.]

Re: 1966 caliper mounting bolt head markings

Original head markings include, 0, TR, M, WB and []. Rear caliper bolts could be threaded all the way or sometimes the spindle flange to 1/2 shaft flange bolts were used which have a 3/8" or so shoulder. Front bolts are 1-1/4" and rears are 1"

[Keith M.]

Re: 1966 caliper mounting bolt head markings

thanks ...how about head marking with a 5 in the middle and 3 lines radiating out and SSC between lines...thx

[Rich P.]

Re: 1966 caliper mounting bolt head markings

5 w/ssc is replacement. Not assembly line installed.

[Edward J.]

Re: 1966 caliper mounting bolt head markings

thanks ...how about head marking with a 5 in the middle and 3 lines radiating out and SSC between lines...thx

Keith, just curious what year is your corvette? I had some of those bolt head markings on my 63 and thought these bolts looked like they had been on there many years due to the rust. they where I believe attaching my front bumpers if I remember correctly.