Just pulled the heads on my Y, good thing - it is a 312, bad thing - no.3 has leaked coolant at some stage, and the +.060 bore is ruined.
Compression was 105, (the rest are 145/150 - flat top pistons are .050 down the bore).
Found that previous engine builder had put the longer head bolts one hole back from the ends,
on both sides... and there were only two, one each side.
Not sure if +.080 would clean up the bore, maybe .100, are pistons available?
Or would it be worth sleeving the one cylinder?
Have 2 spare truck engines, one a b9, the other a c2, have not opened to look at condition.
Which would be the better block for the 312 crank if i can't save my current engine?
Doesn't look deep, but is fairly. Hard to measure.
Engine is only supposed to have done 5000 miles last 13 years,
still got cross hatches. Sat for too long between drives i guess...
Tia, Al.
.
South Australia