Has anyone used a Chamfering Cone and mandrel to port their own throttle body? I am wondering what degree to use, I have found an 82 degree cylinder chamfering cone.

 

your not going to do much.porting a t. body has more to do with the runners,not the t.body itself.i made a fixture to bore the OEM runners,but 1.720 is about as big as you can go without getting it too thin.boring & porting a OEM t.body will pick it up a bit,but your really better off getting a HPI unit with bigger runners (depending on what your trying to do) I made a fixture to make my own throttle plates,but really don't bother too much anymore,its easier & more cost effective just buying one

 

Porting the t/body manifold will help, but you are not going to accomplish much with that method.
We bore the 2 pc Delphi to 46.5mm,(throttle plate goes from 1.630", to 1.840") and the single piece to 50mm.
We manufacture our our throttle plates.
They both work well, and are a cost savings over/above a complete new t/body.
Scott

 

sure,we saw improvments with our bored t. bodies,good improvments.but for the $$ spent,its better (IMO) to spend a couple bucks more & get a bigger t. body with bigger runners.a bored OEM t. body works OK on a up to 95" build,anything bigger (with decent heads anyway) needs a bigger throat/runner t. body to not leave hp/tq on the table

 

1.710" port diameters on both.
More stored plenum volume in the single pc, bored to 50mm.
Scott