The truck had a Mazda 2.0 called fe or 2.2 f2 engine they were the same engine with a longer stroke the valve adjustment were with a hot engine intake and exhaust 0.012 be careful when adjusting the rocker arms had tappet **** when adjusting sometimes the ball would turn make sure it is one the flat side when you are adjusting.as far as tune up parts you should be able to get them on the net. The only truck that l think it was used on was around 1986 Mazda 626.hope l was of help.note in metric it is 0.30mm