heres a shot of the head cleaned up, the damage on the surface in the squish area can clearly be seen.
Formula 1 style reno cam follower (roler) and hydraulic tappet.. these are superb.. and TINY !!! (Std 172!)
Phase shifter cam wheel (Right) and shock absorbing exhaust cam wheel (Left) - Std 172 agn
and, some toys to play with lol
172 block ready to be cleaned and modded for turbo..
A few heads n bits to compare..