Not many reports of burnt valves on the 4200 - maybe that fuel injector is partially plugged and that cylinder ran hot.

Drill J42385-402
tap J 42385-403
installation driver J 42385-404
alignment pin J 42385-303
bushing J 42385--302
bolts J 42385-421
fixture plate J 42385-401

One guy recently was able to get the busted bolts out using a reverse twist drill bit.

You find more pictures on the 4200 site.


51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them