Talked to Rodtech. Looks like they can supply fabricated BA Falcon hubs and BA discs which are a 298mm x 28mm rotor, and supply AUII Falcon calipers. AUII are the same basic calipers as VT, so PBR twin 42mm pistons, which would give almost the same clamping force as a single 60mm piston (aka XF Falcon).

Thus I'd effectively have the same setup as an XF Falcon but with slightly bigger front rotors (298x28 BA versus 287x25 XF) and twin 42mm pistons (2770sqmm clamping versus 2827sqmm of the single 60mm caliper), as I have XF rear drums on XY 9" with custom axles done to HQ pattern with HQ drums (same dimensions as XA-XF drums). So depending upon what the Engineer wants for a master cylinder it isn't all that hard to rebuild a HK double diaphragm booster with a front on it to suit an XE or XF master cylinder with inbuilt prop valve & switch, will just need to make up new lines. Hopefully this will be all pretty well balanced initially with an XF probably not weighing all that much different to a HK with cast iron lump in the engine bay. I may be able to get away with an XA-XB master as these also have 60mm pistons front calipers and the same rear wheel cylinders, that way I could leave the HK booster, distribution block and brake fail switch and just need new lines to the block. Try and see and maybe fit a prop valve in the rear circuit if needed. Bit of homework required for the pushrod depth but easy to fix. Little trick I just learned, if you need a 1.125" bore master cylinder, '68 to '82 Corvette cylinder fits exactly where a HK-HJ one fits.

The fact he loves it is probably good enough! Could you ask him one question - do you have to modify any part of the subframe? The car is all painted and pretty, would hate to have to start cutting!

Edit - another query on these. Rodtech have the option to lower the engine mounting points 25mm, as the top of the crossmember (under the sump) sits 40mm lower than original. This would mean the gearbox could be also lowered by 25mm. Would 25mm lower be enough to allow say a 4L60E to fit better (without hacking the floor member)? Might also allow a Muncie to fit easier without a large floor blister for shifter clearance. I saw the 400SBC and 4L60 in my mate's HK the other day, he had to hack to floor member underside to fit it, but 25mm extra may see it fit?

Edited by user Wednesday, 3 May 2017 6:16:26 AM(UTC)  | Reason: Not specified

Thanks heaps. Will be interesting to hear what he says about any mods to the subframe. I'm not going to cut this car in any way, it is a anally restored body, restored to June 1968 specs for a 307 auto GTS, so banjo and standard wheels which were still standard on auto GTS at that stage. Would love to fit a 4L60E if it'll fit with a 25mm lower driveline but if not i'll stick with the TH350.

Thx, helps heaps!