what size drill do I use for the dowel pins for the head and what size tap and filler for the old oil passage on the head? Please help, and if you have other sites with articles please list..

thanks

 

the dowel pin is 14mm, 90% chance u wont find a shop/place that has that size, so they use 9/16th, which is too big, contact FFgeoff and get the dowel pins from him, thats easier and cheaper, no milling/drilling required.

for the oil passge, u need a 1/8 NPT tap