May 18, 2004 #1 J JUSTAV6 Getting High On PSI Joined May 27, 2001 Messages 223 I have a 4.1 block and I need to drill the hole for the turbo drain tube ,, So what will I need?? What size bit and tap what tread, Thanks for any and all help Seneca Lafler,
I have a 4.1 block and I need to drill the hole for the turbo drain tube ,, So what will I need?? What size bit and tap what tread, Thanks for any and all help Seneca Lafler,
May 18, 2004 #2 4 49-blues Active Member Joined May 30, 2001 Messages 7,628 I did mine with a 1/2" pipe thread,drill size just under that.