I got some more work done on the L20a. I cleaned up the block then I used a strait edge and feeler gauges to make sure deck and head are still flat. Other than the piston damage this should be a simple rebuild. The bores are still within spec, but I am planning to have the block bored over just to be safe. Once I source some replacement pistons the block will be ready for a trip to the machine shop to be bored and honed.
Parts from the motor.
Started tearing the head down.
Rockers removed.
Bare head.
After a little cleanup.