Chevy 350 engine
Was this engine apart?
If so, could be valve lash adjustment. too tight will cause predetonation, however a bad head gasket can be a culprit also. Do a compression check on both cylinders to determine. If your loosing coolant, good bet it's a head gasket. However, a cracked dizzy or carboned up cap can cause it also. I will tell you it's not a timing issue.
Dan
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