It takes less than $6.00 worth of hardware to cc a combustion chamber.
1) get a 60cc or larger animal syringe from tractor supply.
2) a 4x4 piece of plexiglass, an old cd cover will work
3) an old sparkplug to fill the sparkplug hole
4) a teaspoon of vasoline
5) a couple or three drops of food coloring
6) water and a empty cup
position the plexiglas so it covers the combustion chamber evenly. Mark a spot on the plexiglass that is at 12:00 on the combustion chamber and it is at the very top and drill a 1/4 inch hole. You will use that hole to insert the tip of the syringe to fill the combustion chamber with the colored water.
Screw in the spark plug, the valves retained by springs need to also be in place.
Smear a bit of the vasoline around the outer edge of the combustion chamber to act as a seal.
Place the plexiglass over the combustion chamber with the drilled hole at 12:00 and the head angled back slightly so the chamber will fill evenly.
Mix the food coloring and water in the cup. With the syringe piston fully in, insert the nozzle of the syringe in the cup and pull back the piston slowly and evenly to fill the syringe past the 60cc mark. Tap on the sides of the syringe to dislodge any bubbles, and empty and refill till the syringe chamber is full and free of bubbles.
Push the syringe piston to the 60cc mark.
Insert the syringe nozzle into the drilled hole and evenly press the syringe piston in till the combustion chamber is filled.
Note how many cc’s are left in the syringe, typically for an un cut slant head it will be 1 to 4.
There are also YouTube videos on this subject.
On a slant head, the accepted formula is one cc of combustion chamber volume is removed for every .0069 removed from the head deck.
So if you cc the head and find the chambers are 58 cc
And in working the compression calculators you find that a 48 cc chamber gets you to the desired static compression, you can tell the machine shop to cut .069 from the head deck.
to be the most accurate, do all combustion chamber polishing and valve deshrouding and valve seat work and use the valves that you plan to run when cc’ing the combustion chamber.
New valves and new seats will seal with a light smear of vasoline on them.
This may be an extra trip to and from the machine shop but this is how to get the amount to trim the head as accurate as possible to get the final numbers.
I always cc the head again after I get it back from the ms just to verify that they cut what I had requested.
