My recommendation:

1) Timing chain and plastic guides
2) Head gaskets if any oil leakage at the back of the motor is evident
3) Valve stem seals
4) Oiler tubes (cheap insurance against a destroyed cam)


Save the rest of your budget for fixing all the vacuum leaks that are in your future. The intake plenum rubber, the injector cups and seals, the donut seals for the intake manifold, etc....

My indie mechanic says he's been working on M117 for 25+ years and he's never even SEEN the bottom end of an M117 motor. They're nearly bullet proof.

As to the cylinder walls, you are likely to see the FACTORY honing marks still perfectly intact should you take a peek in there. They hard-faced the surface of the cylinder walls with silicon to make them almost wear-proof. If you hone the cylinders, you will lose this.

__________________
-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition