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EH Wheel & Brake Upgrade Options

Howdy all,
I am new to Holden.com just as I am new to car restoration and I am seeking some advice from the experts before I get too far down the track.
I have an EH resto project underway in the shed. I am only planning a 202 for it and am trying to sort through the options to give it 4 wheel disc brakes and 14” mags with the same stud pattern. I have purchased the obligatory HR front end (drum brake). I have also bought a VN rear disc set up which bolts straight up to the std EH diff housing. I had intended to buy a CRS brake adaptor kit which bolts on to the HR drum brake front stub axles and facilitates the mounting of HQ-WB disc brakes. I have checked the compatibility of the caliper piston sizes & it would appear to be ok as long as I use a HQ-WB master cylinder. My main concern is about the stud patterns. I realise that Commodore and HQ-WB are not compatible. I don’t want to get blank HQ rotors and redrill them because I would have to do that again if I replace the rotors. Same for rear. Any suggestions from all your collective experience?
Thanks heaps - Mark

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Hi Mark and welcome
You could just run VN Brakes and stud pattern all the way around
this is what i have done on my FX
Might limit your choice of wheel to much though,
Depending on how you plan using the car once done, but i would imagine that you wont be doing millions of KM in your pride and joy, therefore Run standard HQ-WB pattern on the front ( which is also chev pattern) redrill back to suit, as you will most likely take years to wear out the rear discs so it wouldnt be a major hassle This will give you one of the biggest wheel choices possible,

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You are spot on, the car won’t be a daily driver and replacement of rear disc rotors that start out new will be many years away based on usage. Good suggestion - thank you.

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HQ discs on the front will widen your track.
You can get a conversion to put P76 discs on the HR front stubs and still use the HQ caliper. This will reduce your front track by 1" comapared to using HQ discs. This used to be a common conversion on hot rods.
Standard P76 discs have the Ford stud pattern. If you were ordering new P76 you could order them with the Commodore stud pattern, you could do the same thing if ordering new HQ discs.
As stated above, on a car that isn't a daily driver you would probably never have to replace them.
I put VC Commodore discs on a EH banjo rear end 40 years ago. From memory, I had to use them without the backing plate because there was some clearance issues. VL might have the same problem.
David

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Old is good.

Hi David,
I hadn’t thought about the fact that HQ discs on the front would widen the track. Is this because of the std rim offset difference (I have EH at +6mm vs HQ at -30mm) which I understand equates to 36mm or nearly 1.5”? If so, could this be overcome by buying HQ stud pattern mags with an offset which is closer to EH std offset? I haven’t researched this but I had naively assumed there are many different offsets available in new wheels in HQ stud pattern.
I also wasn’t aware that I could order disc rotors predrilled to a stud pattern that I specify, but it sounds like I can from your post. Is that right?
Thanks for the tip about the Commodore backing plates on the EH banjo. I will need to check that carefully as I have not yet attached the calipers but there looks to be plenty of clearance. I will need to make a spacer up to get the correct preload back on to the axle bearings though because the backing plate is a different thickness to the original EH Drum brake one.
Regards,
Mark

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Hq pattern is the way to go. Just buy wheels with the correct offset and you will be fine. You can have your axles and brake rotors redrilled for hq pattern easy enough. Just make sure the rear calipers don't hit the inner wheel well on the back. A friend of mine had this problem when he fitted commodore calipers on his.

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There won't be any need to redrill the rear rotors. A couple of seconds with a die grinder and the Commodore pattern rotors will fit over the HQ pattern redrilled axles. I have done this many many times on all my conversions all of which are engineer approved.

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