I want to put an oil drain tube on my '97 454 mag. I am trying to figure out if I have the metric or standard plug. The bolt that is in there now seems to be 15MM. I was told that some engines of that year were standard and some were metric? Any idea?

Dave M.

12mm x 1.75....look at post on first page of tech Q&A. '97 should definitely be a gen VI motor. If the timing cover is cast aluminum rather than stamped steel, then it is.

I FOUND THAT THEY MAKE 2 SIZES 9MM & 1/2-20 THREADS. WEST MARINE SELLS A BRASS 90 DEGREE FITTING THAT SCREWS INTO PAN THAT YOU SCREW A STANDARD FLAIR FITTING ONTO.JUST PULL PLUG OUT OF PAN AND MATCH THREADS UP IF YOU CANT TELL WHAT THREAD SIZE YOU HAVE.I USE THEM & THEY WORK WELL.I USE A LITTLE PUMP YOU BUY IN WALLMART ON A CORDLESS DRILL TO PUMP OIL OUT.