What's wrong with my motor?

swinger 367 said
is the rocker shaft installed properly?

70aarcuda said
rocker shafts oil holes need to be pointed down and towards the exhaust...

another thing...there are right and left rockers arms..if you are using stock rockers...

that does not mean right and left side of the engine...it means each cylinder has a right and left rockers

Yep, I'm aware of that all of that.

But would lack of oil at the rockers, or incorrectly installed rocker arms/shafts, make enough noise to make it sound like a diesel? I wouldn't expect it to rattle so much if that was the only problem.

My gut tells me that for some reason, the right side of the motor is being starved and the lifters are not pumping up.