Well, I decided to see how the cylinder on a stock 6.0 bore matched my TSP PRC 2.5 truck heads. This is a pic inside the bore of a stock 6.0 cylinder looking at the bottom of the combustion chamber. Looks like I could remove quite a bit of material. Anybody done this? It also makes me think how close the intake valve was to the cylinder wall on my 5.3.

 

yep mine was part of the performance valve job i had done

 

Did you look at it from the inside of the cylinder like in my pic? Mine was CNC'd when I bought them.

 

no i didnt

 

I will take a better pic tonight of the head off the block. I scribed the outline of the cylinder.

 

From the side of the exhaust valve to the side of the CNC'd chamber it is .078". If I opened it up to the 4.030 bore it would be .138". The intake side would be .1575 if I opened it up to the 4.030 bore. I just think it could add a little more airflow. According to my math if I am doing it right, it would have only left .011 away from the stock 5.3 cylinder wall. I wonder if flowed on the stock 3.779 bore if the larger valve would even help.

 

i did it by picking up a set of trickflow 225's. it's a little more expensiveof a method.

 

I opened up the chambers to about the stock bore. I didn't finish it, just wanted it close. I will finish opening it up after the block is bored. It looked like it made quite a difference on the side of the exhaust valve.

 

why not pay a machine shop to do it?
Do you have a way of measureing cc of chambers?
using a dremel doing it your self will make every cylinder a different cc combustion chamber

 

Yes I can measure the CC's. Measuring CC's is not hard at all. I would rather do this work myself. There are certain things I like a machine shop to do like machining. I would rather do everything else myself.