Triumph 350 & 500 Unit connecting rod insert bearingsWhether you call them rod bearings, insert bearings, shell bearings, or big end bearings, they are a very important part of your engine. Available in standard and four different undersizes, and supplied in sealed packages of four (for two rods). Triumph factory part number 70 3706 Triumph 350 and 500 connecting rod journal bore is 1. 5630" (+ . 0005") when torqued. Fits Unit construction 500cc and 350cc connecting rods. These are also the inserts used

these are the legendary Black Diamond™ valves

If you are building a Triumph 650 engine or need to rebuild a head

4 rocker box inspection caps ( 70-3751 or E3751 )

Most shops don't bother to even open the boxes when sending out engine parts

AF is not recommended for rough flange surfaces as it does not have the gap filling properties of Hylomar M or Hylotyte Red 100

this popular sealant is used by lots of top manufacturers in the motorcycle world

57-1607 Bronze thrust washer Kibblewhite

This kit is designed to service rocker boxes on all Unit 650 & 750 Triumph engines from 1971 to 1972 with 4 bolt inspection covers

For more information on installation see our tech pages

For "classic" gear oil safe for vintage gearboxes click here

Seat pressure is 68# @ recommended installed height 1

but getting all the correct wear parts together sometimes is