Originally Posted By HotRodDave
So it looks like the holes are .720 according to my sliding calipers, could I put 3/4 tube in it if I freeze it and heat the head to about 200*?


You wont change it .030 .. drill it undersize and
do a light press with JB Weld on it..I also covered
the ends to make sure they sealed... I actually used
a adjustable reamer to make the finished hole
wave