BBC 088 heads
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BBC 088 heads
I recently picked up some bbc parts that were on an HP500 motor. I bought everything except the block. Going through the heads which are GM iron heads 088 castings. I found numerous broken valve springs destroyed shims but the most troubling is serverly pitted exhaust seats and valves. I was told these parts came from a running hp 500 with 200hrs or so. Both heads at #7 and #8 cylinders have serve pitting on seat and valve one a little worst than the other. I assume reversion or some kind of manifold leak or gasket. Is this common and these motors?
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I recently picked up some bbc parts that were on an HP500 motor. I bought everything except the block. Going through the heads which are GM iron heads 088 castings. I found numerous broken valve springs destroyed shims but the most troubling is serverly pitted exhaust seats and valves. I was told these parts came from a running hp 500 with 200hrs or so. Both heads at #7 and #8 cylinders have serve pitting on seat and valve one a little worst than the other. I assume reversion or some kind of manifold leak or gasket. Is this common and these motors?
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Well that explains all the pitting on the exhaust valve and around exhaust seat. Both will need replacement. The only thing I wonder why only the back two cylinders? All other combustion chamber seats and valves look great.
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Just finished spot,peen one head definalty going to need an exhaust seat not sure if it can be savaged. Along with my many hp500 parts I was cleaning up the pistons and started measuring the rings and a bit confused. Top ring 2 mm second 1.5 mm oil ring is 3/16 what! I can't even buy a set with that arrangement from JE. Anyone else run into this also oil,ring width is .107 which is a lot thinner than they spec ?????????
#6
Just finished spot,peen one head definalty going to need an exhaust seat not sure if it can be savaged. Along with my many hp500 parts I was cleaning up the pistons and started measuring the rings and a bit confused. Top ring 2 mm second 1.5 mm oil ring is 3/16 what! I can't even buy a set with that arrangement from JE. Anyone else run into this also oil,ring width is .107 which is a lot thinner than they spec ?????????