![]() Early ones still had the TR6 casting bosses beside the T120 inlets.ġ963 Unit construction 9 bolt head introducedġ969 Deeper pushrod tube receiver hole in head with a slight chamfer to guide the top O ring into place.ġ971 Changed rocker box gasket. Just run it.ġ959 Bonneville dual inlet splayed head. If the crack is small they will still work fine, valve seats are cast in so they cannot fall out. More crush warps the head and less gets leaks at the pushrod tube joints.ġ956 first year alloy head, these are prone to cracking between the inner stud holes and valve seat. Mix components or fit thicker or thinner head gaskets to get this amount. 030’ off the gasket before torquing the head bolts. 030” “crush” that is the head should be about. Had shallow combustion chamber with beveled edge near the head gasket surface.ġ967-74 500 Hemi head (69-74 head pictured) – 1967 and later inlet manifolds retained by 5/16 screws rather than 1/4 studs. This is a 1966 head.ġ958-66 500 Squish head used studs to retain manifolds. Cylinder head identification:ġ957-62 factory replacement head has cast boss for bolt un-drilledġ963-72 9 stud with center head bolt (see next example for 71-on locating dowels)įactory replacement head with casting for 10 stud (71-on with locating dowels)ġ972 650 head with bolt on inlet manifoldsĭate code located in the inlet rocker box cavity. The 350/500 is addressed at the end of the article. This will cover the Pre-Unit 500/650 as well as the 1963-83 Unit big twins. We will try to clear up some of these questions beginning with the earliest post war versions and working up to the last models produced in late 1982. ![]() This similarity in parts has led to much confusion on what works with what in the way of lifter blocks and pushrod tubes and cylinder heads. The Triumph twin cylinder engine began life in the 30’s as a 500cc and was eventually expanded to 750 cc but the design remained remarkably constant throughout the 44 years the Meriden factory produced them. The neophytes guide to Triumph motorcycle Tappet Blocks, and their applications made easier. 1945-62 Pre-unit and early unit construction twins with cast iron cylinders and alloy head (The 500 alloy not addressed here).The neophytes guide to Triumph motorcycle Tappet Blocks, and their applications made easier.
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