The picture of the plugs was taken after a week of running with a badly
installed and possibly cracked performer intake. I replaced the
performer with the stock intake and the plugs are now running clean.
But I'm still loosing a gallon of coolant every 100 miles. The engine
doesn't smoke or overheat. Actually, it runs fine. There is no coolant
in the engine oil or tanny. There are no external leaks. The cooling
system was pressure checked and held over 10 lbs of pressure over
night.
I've pulled the heads and had them magnafluxed and checked. After
lapping a couple of valves they held pressure. The heads didn't need
surfacing. I reinstalled them with new felpro head gaskets and new
head bolts.
The block is a GM crate engine about 6 years old.
The heads are '69 186 camel hump heads with quite a bit of work.
I'm guessing I have a crack in at least one head that is only opening
up when hot that is allowing coolant into an exhaust port.
Anyone want to sell me a set of good heads? Actually, if someone would
tell me I'm crazy, that would be a relief to me! If I wasn't so cheap
and stubborn, I'd put in a new longblock. But I don't want to loose the
work on the heads if it was not the heads causing the problem.
