It really depends how well you get it rolled into the groove. 1/4" is too much. 1/16" is plenty if it's well seated. A dab of RTV around it at the mating surface doesn't hurt either.
Yeah it's got me a little confused too. The way the intake is, two cylinders share a barrel from the carburetor. 1-6, 2-5, 3-8, 4-7. But when I look at the plugs, cylinder 2 is black, but cylinder 5 seems to look fine.
Nice job man.. I'm getting ready to do a 59a. I want to build the most reliable flathead possible to make the 5000 mile round trip to bonneville next year Posted using the Full Custom H.A.M.B. App!
What is the plate for? I don't think I have that piece on mine. Damn! Posted using the Full Custom H.A.M.B. App!