1991 420SE: timing chain slipped off

[benedict]

Hi,

420SE 99,000 miles. Car was running absolutely fine and parked for the night, the next morning started car and bang bang bang, switched off immediately.

Had it towed to my local Indy where he pulled both heads to look at damage. Result is the chain tensioner has collapsed and chain jumped off causing major damage; dents to top of piston with four valves mashed to not much.

Mechanic has suggested replacing with four new piston's, four valves and valves seats. Basically rebuild one side of the engine.

My question is what will be the end result by having four cylinders with a new higher compression and other four with a compression lower due to 99,000 miles on them.

Is the engine likely to shake about having varying compression's or maybe even vibrate?

Just weighing up options as to whether doing a) patch up job, b) full rebuild or c) second hand engine.

Any input will help to make a decision.

Thanks