MG
The Classic Marque

Thought you'd bought an MX5 for a minute 🤣🤣

diameters, yes.
Was meaning just leave the short 1 1/16" valve that you already have, then use .100" lash caps to get them up to close to the length of the 1275 inlet. I think it's about .120" difference in the lengths--Just thinking of the easiest/cheapest way of getting a result, but I guess it's starting to get a bit messy like that
Might be better just spinning a tiddle off the dia of ...

Willie, when you say standard for the exhaust do you mean one inch? That would mean going down to a small bore valve (short), combined with a big bore inlet (long). I haven't heard of anyone doing that.

I assume your ratio is based on diameters not areas.

Spot the Doji. 😁 😉

https://youtu.be/nGy9uomagO4?feature=shared

Stainless do , we were on titanium inlets and inconel exhausts. Inconel is heavier than stainless but stronger so the valves could be machined way thinner for good flow without sacrificing strength on that side-

With the heads Les has I'd go the 1275 inlet and for the exhaust, leave it std. but with the grinding concentrate on getting good flow shape after the valve seat and around the val...

At least one has been road tested in Australia recently. Could stop the grumbling over here about China not making 'real' sports cars?

I would be thinking of a very large clear plastic/vinyl envelope with the opening trapped under a front wheel? Would also protect from showers. Just an idea.

Wilmot Breeden as far as I know, although I have never been able to find any names/trade marks on the several original wheels that I have examined.

2.3" that's huge! I thought large diameter valves were prone to heat distortion and warping ?

Back in our old experimental days we used to poke the biggest inlet valve in that we could find then match it up with a decent sized exhaust that'd still fit in the chamber. We were using the best heads available at the time Brownfield offset port head (small block chev)
Best dyno results were from 2.3"inlet matched with a 1.8"exh ---78%