Hi Ian and Simon, Thank you both for your detailed information, I now feel very comfortable following your advice. I will take the bike for a short run leaving the gaps at 1.5 and 3 thou., then re tighten the rocker box bolts and then set the clearances exactly as you suggest. I do have some Drags a...

Hi, I am new to the Ariel fraternity and have found this forum incredibly helpful. I am sure I am going to ask lots of (probably very dim) questions but for now I just need advice on tappet clearance. I have a 1953 NH which I presume was manufactured prior to June 1953 as it does not have a letter R...