Could someone please I.D. these cams for me, they are in a 66 650 T-bird. Part no's are inlet 71-0042 and Ex is 70-9990. Do I need "R" tappets on the exhaust and would the rocker clearences be the standard 002 in and 004 ex. Many thanks. Retired-fireman 76TR7 and 5 others!
Hello from tech 108, I have a 1966 TR6 SR which uses different cams then you do but my Triumph parts book for that year shows a E-4818 cam number and E-4848 for the exhaust.Perhaps they are superseded by another number. The R tappet has a increased radius for quieter operation and some other oil holes for increased oiling. I go with .003 valve clearance so I have to buy only one feeler blade at a time. You will never hear the clearance difference over the vibration
#101467 - 09/21/061:40 amRe: 650 camshaft part numbers