So I have started to drive my 51 more now that the weather is turning and this is probably the most use this car has seen in 20+ years so I am really paranoid about everything and just waiting to burst into a really cool looking ball of fire. Anyhow, there is a knock of sorts, but it is unlike any knock I have heard before, it only comes out at higher RPMs and load when the engine is warmer, i.e. going up a hill, 50 mph. If I stop and rev the engine while parked, nothing. So I guess where I am going with this, is this something that is normal for a Kaiser, or should I be looking into buying some rod bearings? Possibly detonation? I really don't feel like blowing a hole in something that can't be replaced.