You might find this interesting http://www.tildentechnologies.com/Cams/Tip_Lash.html -- Randall > I have 1960 tr3a owned for 5 years runs great no trouble strong puller > idles ok what do you think valve clearance might be? engine > is fitted with 86mm pistons and tr4 dual exhaust, slightly noisy > tappets.many thanks Dave