|
Registered
Join Date: Sep 2008
Location: Black Mountain, NC
Posts: 470
|
These holes are easily capped with proper fitting plug; the plugs I just used just last week are BMW oil drain plugs (17mm ATF) with copper sealing washers. I wish I had a photo to post but these heads went to the engine builder last Thursday.
The tapped holes were actually used to inject air into the exhaust stream to complete combustion and reduce emissions.
|