Help needed- RV8 exhaust manifold bolts

[900T-R]

Right, one won't catch because it's too short and I need a replacement - only thing is we normally only use metric sizes here and I'm sure this is Imperial or whatever you folks in the UK are used to use, so I'd be a happy chappy if someone could tell me the size

[v8 racing]

Got to go back to the yanks! 3/8unc

[900T-R]

That's quick - thank you Sir!

[walt762]

ACT sell a set of ARP manifold bolts & post out pretty quickly.

[LordGrover]

I bought these: click - arrived following day.

[pwd95]

I've got a spare new one left over from when I did the old wedge. I assume it's the same thread. Drop me a PM I'll pop it in the post tomorrow. Worth a try.

[rev-erend]

Also worth adding that they are 1 inch long.

[900T-R]

Thanks all!

The one that's too short and doesn't catch is 1 1/4" (apparently there are two others but they are still tight as far as I can tell) - got 1 1/2" long ones this morning (try getting UNC or any non-metric bolts on a Saturday - I did and failed). Had removed the spring washer from the offending bolt as an interim measure.