Adam,
i have a 9.5" inch clutch in my series three shorty, but i have a flywheel that was fabricated specifically for the conversion, so it's about 10mm larger in diameter than a standard red motor flywheel. You might be lucky and have this type of purpose built flywheel in your conversion.
Or if you don't you could try to pick one up, which shouldn't be too hard, as there are plenty of people pulling Holden Conversions out of series Land Rovers.
The other option is the Hohars might have one.
You can drill a standard red motor flywheel to take a 9.5" Land Rover clutch, but the holes end up right on the outer edge, but still doable.
Another option that might be worth looking into is using a pressure plate from the a WB era Holden as i "think" they had a 240 mm (9.5") clutch, but had the same bolt pattern as the earlier smaller pressure plates on the red motors etc. But they may have a heavier diaphragm than a Land Rover 9.5" clutch, so could be a heavier feel. You would have to follow up the specs.
I am currently modifying a standard 2.25 Land Rover flywheel to take a Holden ring gear, bolt up to a Holden engine, and it will have the 9.5" clutch, but i still have a bit to go with it. It will weigh about 3.5kg more than a Holden flywheel, so offer far better low rev range pulling power.
I have driven a swb S3 with a Holden 173 that has a 2.25 flywheel and the difference is extremely noticeable.
Two of my shorties with Holden engines have 9.5" Land Rover clutches from ACS (Australian Clutch Services) in Adelaide and they are beautiful soft clutches. I highly recommend them, they are well priced too, available through Bursons, and no doubt Repco, etc.
You are welcome to give me a call. PM sent with my phone number.
Good luck.
Cheers, Mick.
1974 S3 88 Holden 186.
1971 S2A 88
1971 S2A 109 6 cyl. tray back.
1964 S2A 88 "Starfire Four" engine!
1972 S3 88 x 2
1959 S2 88 ARN 111-014
1959 S2 88 ARN 111-556
1988 Perentie 110 FFR ARN 48-728 steering now KLR PAS!
REMLR 88
1969 BSA Bantam B175
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