| its easy to do with the manifold on the truck, just let it idle shaving will blow out. start with a small bit, then either go directly to right size for your fitting or some use another smaller bit.
this may be useful
1/8-27 NPT use "R" (.339) dia. drill
1/4-18 NPT use 7/16" (.4375) dia. drill
3/8-18 NPT use 37/64" (.578) dia. drill
i would get a good drill bit not the regular black high carbon steel bits.
make sure you wear safety glasses or goggle, there will be metal shavings flying out.
be careful make sure you do not push the drill to hard, so you do not run through and hit the other side.
use lots of spray when tapping the hole.
alot of people are afraid to do it this way, but it is easy not replacing gaskets or worrying about exhaust leaks. |