There's a special place in Hull reserved for the inventor of auto correct.

That's not a Le Mans bonnet.  This is a Le Mans bonnet: See where the headlamp fairings fit.   This one is from Honeybourne and is cheaper!

Aye, Colin, as your namesake would have said, "If in doubt, flat out!"    But the project has carburettors, so no return lines. Paul, thank you!  I can now see where the 'changeover valve' should be, more or less where I thought, between the tanks, before the pump.     The valve I have, the 'on/off' one would work in that return system, but  not in the 'Feed' one.   I'm still puzzled why the 'either/or' valve on sale is subtitled 'Return', but anyway.... As to why two tanks, the original GT40 had bag tanks in the sills, but that terrifies me! And my wallet.  There's room for two 25L tanks between the engine and the bulkhead behind the seats, and 50L should be enough, even for 3.5L and the use I hope to make of it. John  

Thank you! Sometimes to best way is to just get on with it, however I’m beginning to think I should have just put in another triumph box haha

Well, today I went for the first drive with the 5 speed. I got the clutch release working by some miracle, and then spent around 6 hours modifying the exhaust headers to fit around the starter.  Got it all together and took it for a drive, it works. It shifts into all 5 gears lovely and reverse too. However when I had it running on the jacks and went through the gears it was vibrating itself to death any rpm over idle, the higher the gear the worse the vibration. This vibration was not noticeable on a road test which is strange but things act differently under load, and I only took it to around 40. Also I can hear the clutch release bearing dying. The bearing was *just* big enough to use the triumph pressure plate, or so I thought. Presumably I need a bearing with a bigger contactpoint/diameter, or a pressure plate with a smaller internal diameter.  The clutch also has small amount of travel and feels weird, not sure when it’s fully depressed or not. I’ll have to make some revisions there. And the exhaust headers are blowing from somewhere, obviously when welding I’ve missed something. So few things to be getting on with there, I reckon I’ll get a custom prop shaft made as that vibration was terrible and I don’t want to risk it killing me, Nick Jones you can say you told me so.  Also I think I’ll remake the spigot bearing, I bored the centre out a little more than a meant to to fit the mx5 box, but I thought it would be okay. I’ve got a spare so I’ll take 14.5mm out instead of 15. The starter sat too far into the bell housing for the revised flywheel position so i just spaced it out with a couple of washers which did the trick, I was going to make a proper plate but there is no flex here so I’ve decided it’s fine also that starter motor is far too close to the exhaust, I’ve probably got around 5mm clearance, I’m going to make heat shields to prevent some of the heat but in my experience on cars it’s the electrical components exposed to constant heat cycles that fail first so I’ve got that look forward to. like I mentioned before I am putting a different engine in eventually and it will have a totally custom manifold so it won’t be near the starter. I only need this to work for a couple thousand miles.

I think you would want it to ensure the excess fuel is returned to the tank in use. Unless you ensure never to fill the tank in question to the brim. And avoid idling/small throttle opening with attendant high fuel bypass for extended periods Or always drive flat out so there is no fuel return

Oof, Le Mans wheels! But £1400 for 4. And what size is 14.5x6.5...?  https://www.ebay.co.uk/sch/i.html?sid=godinsltd&_pgn=1&isRefine=true&_trksid=p4429486.m3561.l49496

Naughty boy 

Wrong engine size and external slave not internal concentric……

Out of my budget at the moment, and very likely wouldn't fit my mk4, but there's a rather lovely looking GT style hard top and bonnet on ebay at the moment: https://www.ebay.co.uk/itm/376063269177?_trksid=p4375194.c101949.m162918