never seen a rb20 burn a valve yet
vavles...... $10 ea
Removing the head, dont use alcohol.
Big job, if you choose to accept it yourself
elaboration, ever notice how on a rb twin cam how something could fall into teh exhaust manifold and land right on number 4, its teh most direct route..
A mate once found a micromachine in teh sump of a 253, might find that lock nut after all