Originally Posted by
ANDY black s13
I see in work done to engine you mentioned relined cylinders, a big drop in compression on all four,not equal but all for have something
suspect's could be, piston to bore size is incorret,all four pistons have broken rings, if head was dismantled all the shims and rocker arms are mixed up
and at least one valve on each cylinder is slightly open, is the cylinder head known to be good ?,or is it from another engine
.as SR heads can crack around spark plug holes if they get super heated from detonation/or low coolant overheat,
with the head off now you can check most of the above