anyone know the size of the opening on the back of the block for a b18b where that black box sits? im putting in a catch can and i tried measuring that back opening with the motor and everything in and it seems to be about 1.5 inches outside diameter but its hard to tell since all that other **** is in the way. i might just pick up a plug at the local lowes since the dealership doesnt have one.

 

You should be able to find a few different sized plugs avalible at most any autopart store.

My breather kit came with a plug but I didnt take note of the size before I installed it.

 

have the part number from advance auto parts at the shop. they have them in the back in the black drawers. u could caliper it and go up there or if u can wait till mon. night, i will find the bag. we buy them all the time. u get the h22 nipples from honda yet, or are u going a different route?

 

34.2 or 34.3mm freeze plugs