blown 2 head gaskets

are you sure the block is straight
and the heads

the shop who did it was he using a stone or a cutter(knife)
on is machine

the first the guy did mine he use a stone
and the seem to be straight but hade more than .003
where the cylinder are there is less metal so the stone
wasnt doing is job correctly and was (grinding more metal)

for the valve color could be the prestone or water the engine burn

buy a copper or multi layer gasket retorque does heads
and go racing