Finishing up some of the last things to do on the engine and these bored holes suddenly caught my eye and have me scratching my head:



Those threaded holes are on both sides of the new engine, but are NOT on my original 68 400 engine. Somebody please tell me they are for the infamous 9th and 10th afterburner spark plugs.

(After all, this is the infanous M3 428 HO we are dealing with here. Okay, not really. Couldn't help myself.)