Section 30 in the R&O has instruction and drawings of the valves, guides, seats and springs.

Carl-Erik Renquist wrote:

Section 30 in the R&O has instruction and drawings of the valves, guides, seats and springs.

I don't have actual measures, sorry. It was a long time ago I fettled with 37ci valves, but isn't they same as 741 valves?  In that case they are easy to obtain even NOS and cheap. The guides in some cases has to be custom fit to the hole size as Tim suggests. Be sure they are cast iron, brass guides or -sleeves doesn't seem to work well.

Hey Rex, 3  angle seat usually,somehwere around 0.080" wide for the inlet seat, its ok to go wider with the exhaust say up to 0.110" to aid cooling.

  Indian valves all 35 degree seat. The valves Greg sells may well be 45 degrees, and with the wrong collets and too long stems, not sure why, but I have seen a few like this, and I usually apply the flotation test, as recommended by Dave Richardson in Guzziology ( Sling them in a lake, if they float , they may be useable.) Also the hardened valve seat may be 45 degrees, and will need a lot of cutting. I always recommend getting the cylinders without the hardened seats, tbh, as to fit stock valves you will need to cut away a fair bit of the seat to return it to 45 degrees with a three angle. May need to apply some Kentucky windage to go with what you have.

Yep, the hardened seats are real good, just need a bit more cutting in to use the 35 degree stock valves. Can you contact me by email ?

Tim