I bought a 455 that has an expansion plug where the oil fill tube goes. The valve covers have baffles that look like they would make adding oil through them be painfully slow. I'm thinking I would like to leave the fill tube out but I was wondering if the hole could be used for the PCV valve without sucking tons of oil out of the engine. I know oil would be flung off the timing gear but there is a sheetmetal baffle so the oil couldn't hit the PCV directly. I was just looking at having a slightly different look to the engine. What do y'all think?

 

Pull the plug and put back the oil fill tube. The oil fill also lubes the timing chain and fuel pump eccentric when you do an oil change.

 

 

The spit hole in the oil galley plug does the timing chain oiling. If you remove the cup plug, make sure the baffle is still in the block under it.

 

You'd still pull a lot of oil if you use that hole for PCV. There's too much splash from the front oil galley squirter.

 

Thanks for the info. I've removed the plug and will install the tube, if I can't figure out something else.

 

You could add a rocker cover that has no baffle to add oil. I used one on a Chevy motor years ago never was a problem. As for timing chain it gets lube from the oil pan. So plugging oil fill hole in block is really not a problem.

 

The chain gets lube from the oil galley plug in the front of the block, same with the fuel pump eccentric, the oil pan is there to catch the lube and return it to the sump so the pump can pick it up and start the process all over again.