Just been doing some more investigating on my odd sounding no 1 cylinder and decided to check compression. I am getting 135 psi on all 4 pots so no drastic difference on no 1 cylinder
That said are these readings a bit on the low side as the maintenance manual mention 177 psi
I should add that engine had a full rebuild 2k miles ago with new pistons and rings and I also regrouped all valves in etc
I should add that this was a “dry” test ie no oil put down bores etc