Originally Posted by bowhay

it ran fine with 91 octane
didnt ping or detonate
but the head gasket blew and when the water went into the cylinder it over compressed witch blew up the piston then the pieces of alluminum cracked the cylinder wall

but i guess i got to look at the bright side
new forged pistons and H beams :P
but i still have to have my back up block bored cleaned and clearenced