30th Jan 2015, 04:01

Years ago I had a 78 Olds Cutlass Supreme with a 260 that developed an intake manifold gasket leak with the coolant. When I removed the intake manifold to repair it, I also cleaned out the crust & sludge in the engine block. Not sure what you call it, but there is a plate that has 3/8" small holes (one per cylinder), which I guess helps keep the oil in the top half of the motor & controls the flow of oil to the bottom of the block. Since the engine is tilted a little toward the firewall, the back 2 holes were blocked. Once I cleaned them out & put the engine back together, the knock went away. I always wondered if this was solution to the "Chevy Knock". Good luck - it was an 8 hour job for me (I'm not a mechanic).

My mistake was I sold it in '92 because of its age (160K miles) & it drove me nuts in stop/go traffic (it wanted to coast while the 4 cylinders didn't). That car was amazing & built like a tank - I still miss it.