Porting the heads on my 1987 Callaway TT....

Hard to get good pics, but almost done....

 

Car will be using this prototype Camaro 1LE intake that GM was working on ....apparently this thing can seriously flow some air..

 

You are going to leave a little something in the runners to the head for turbulance, right?

its not beneficial to have slick walls after the fuel has been sprayed into the airstream...that causes the fuel to separate and become wet again. A nice textured surface will keep the fuel molecules mixed in with the air...

The cutting looks great ! just go back thru and brush in some texture to help keep the turbulance. if the walls are too smooth the fuel just clings to the walls and separates..

 

Don't have a fuel in suspension like on carb intake ;
the injectors spray directly onto the backside of the valve dispersing the fuel

 

Rougher surface can work but being as he has boost he will probably be fine; As it is the 113/128 heads are pretty wheezy so anything helps.

Its said a carbide finish is really best on the intake side or at least the last in or two before the valve but put up pics of that and peopledont understand why.

Least the price of his labor/gains is right

Have an old 128 head that will test that theory out on when I get a few bux to waste on flow bench time. Know smoothing things out with a roll gains you absolutely 0 regardless of what Summit tells you when they sell those cartridge roll kits.


Keep us posted Lgaff

 

smoothing out the runner just helps with turbulence.

the real gains are in opening up the bowls around the seats and valve area, the stock casting always have extra material that just takes up space and impairs air flow around that area.

 

Exactly !

back in the 70s we polished everything like it was chrome inside...looked fancy, ran like it was ful;l of regular gasoline. Took many years for someone to figure out thru some real science that the "boundry layer dynamics" were actually pulling the fuel out of the air-stream and it was clinging to the smooth walls where it pooled and becamse wet again instead of the mist that would have been inter-mixed with the air molecules.
Thats where I first heard of the "porting rul of thumb" where a matchbook striker was just about as smooth as you want where fuel is present. That applies to everything except alcohol and nitro since they are much thinner and bind to o2 better than the heavy larger gasoline molecule.
Those cartridge kits DO have purpose, as long as folks know where to stop. The casting junk and excess material in the bowl and around the stem gotta go, so the basic flow rate jumps up, as long as the surface is left brushed. I'll open mine up all the way, then polish above the inj point to maximize the flow since its just air, then rough it in from the inj to the bowl.
I just did one that I opened, polished semi smooth then went back and textured the surface with a nylon wheel to take the "gloss" off and leave some texture there for the boundry layer to roll against. Its a delicate balance of improving the speed of the flow without setting up the dynamic for unmixing the fuel charge...

This casting looks nice and the work looks very good. Seen too many chop jobs that were inconsistant and uneven....something to be said for equal volume in runners and chambers. This example looks to be pretty well done.

 

Walls are smooth but they have some texture to them......forgot to mention I had 2.00 and 1.56 valves to install....Manley race valves

 

Pics look good on the porting. What are you doing in the chambers??

Are they swirl-polische, necked and back-cut??

Don't forget the 3 or 5 angle valve job.

 

Here are the valves..

http://www.summitracing.com/parts/MAN-11500-8/?rtype=10


Not going crazy on the chambers....just cleaning them up and removing the boss intrusions