Threading oil galley and coolant plugs

[Peterson]

What are you guys using for thread size in the 5.9's oil galley and coolant plugs in the block? Behind the tappet cover, behind the front cover and trans plate. Front and rear I believe 1/2" pipe will work but curious if I should drill the others out to fit a pipe thread or? Thanks for the info guys!

 

[Peterson]

This is on a 55 block also.

 

[jimbo486]

I know you're asking about threading the holes but I used JB Weld ClearWeld epoxy on all the expansion plugs on my block and head. I got the idea from Will at PDD in his Junker Drag Truck build thread. Not sure if he's changed things since. I haven't seen any further mention of how that's holding up.

 

[Peterson]

Been looking closer with a tap and looks like I may just do that.