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Performance Porting

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On this page are some photo's of some work in progress and some finished porting jobs.

CCing Cylinder Heads
CC's are units of measure to find the size of a runner, combustion chamber or valve reliefs

CCing is used to help determine the size of a port runner (intake & exhaust) or combustion chamber or pistion valve reliefs. All this info is needed to find out what your compression is at.
 A burret is a glass tube which is marked with markings on it so as you fill the runner or combustion chamber it tell you how many "CC" units it takes to fill the area.

This photo is showing % areas of flow loss.
The pic above shows the areas that hurt flow in a stock head.

The area's in the pic above show you the ares of a stock cylinder head. This is where hand porting is so important vs cnc machining. Yes a cnc machine can duplicate from port to port without any issues or varience +- . They still need a skilled cylinder head porter to first go in and do major research and development to have the runner digitized and put into a cnc program to duplicate the port design.
The areas above are the places i work to get the most out of your cylinder heads that are going to meet your requirements of your engine size and hp & tq curves. Yes you can just hog out a port , but what you will wind up doing is ruining the cylinder head. The intake runner needs a rougher finish due to it has a wet flow running through it verse a polished exhaust port. If you have a mirror finish or hogged out port  on an intake runner it is going to do two things. 
1) the wet flow of the intake runner will stick and not evaporate quickly enough and will cause rich or lean conditions in that runner.
2) If the intake side is hogged out you will lose velocity in the runner. Air has to keep the atomized fuel in suspension from the intake to the valve. If it doesnt the fuel will drop out of suspension and stick to a port floor or wall causing issues.
The exhaust side is expelling gasses that were just burnt in the combustion chamber, so with the mirror/glass finish it isnt important to have the port finish rouch like the intake side, due to it doesnt have wet flow, its mainly gasses.

These heads were chevy small block fuelie/double hump heads.

These heads are a set im doing for a client who wants a stealth look of stock appearing heads.


As you can see there is a ton of casting flash and the line where the top and bottom of the sand cast head came together. This all hurts performance and flow.

Almost finished runner from above cylinder head
At this time i had almost 4 hours into this port alone.

Finished runner from the same cylinder head
Well after many hours spent in these heads they were finally finished i called the happy customer.