914/6 rear caliper spacers, one solution Options

[michel richard]

In the process of restoring my 914/6, I want to have vented rear rotors, mostly because I'm going to have a big engine, but also because I think it's kinda cool.

The stash of parts I bought from Jon Lowe contained some rebuilt original 914/6 rear calipers.

It also contained some good condition 911 front calipers "A" calipers I think: 3 inch bolt spacing, steel, and with a spacer. They had 48 mm pistons.

To build rear calipers that have a spacer, there is one recipe that uses the spacers from the rear of 911 mid-year calipers, as well as other hardware. Those spacers are 10 mm. I don,t have such calipers and initial attempts at getting some were unfruitlful.

So, I took the spacers from the front calipers that I have, but they're 7.5 mm thick.

[michel richard]

Just looked at the McMaster Carr website. They do have 7mm hardware, but not socket head cap screws, at all, and not standard hex head in anything above 50 mm.

It looks like the closest they have is 8mm by 70mm. That would probably mean drilling the bolt holes in the caliper oversisze, and I don't want to do that to my unobtanium 914/6 calipers unless there is zero other choice.

The other alternative is to use the hardware off of core 911 calipers.

Michel