What would you recommend and why? I'm talking about something to block oil return holes except front and rear ones. There're two different styles of plugs: solid ones and breather-like; they all require cutting threads in the block. IMO it's better to have some vents between lower/upper crankcase and heads; what do you think?
And another question: where're the best places to glue in magnets in block with factory design roller setup? Hey, I'm not so stupid, I know where to put oil screens, lol...

 

don't think it'd make much differance, but if you want the vented kind buy a 1/4 NPT nipple about 1.5 long and you'll be all set for a lot less jack that the ones jegs sells