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DIY Guru
96 Ranger-stock
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637 Posts
Discussion Starter #1
How to CC a Combustion Chamber

The subject head is a Chevy LT1 Head

The first set up is used when the valves do not protrude above the gasket surface.
This is simple in procedure. Fill the CC burette with a fluid, I use water, some use a color alcohol, cover with the sealing plate, then flow the fluid through the hole in the seal plate till all air bubbles are out of the combustion chamber. Then read how much fluid has flowed from the burette.
This stock head measured 54cc




The second set up is used when the valves do protrude above the gasket surface.
This is a little more difficult in its set up.
Since the valve heads protrude above the gasket surface, the seal plate can not be used, I use my dial indicator with a point, The indicator must be zeroed, with no pre load to the deck surface. Once that is done it is a matter of leveling the head and filling the combustion chamber just till the fluid touches the indicator point. Then read the burette.
This LT1 head measures 49cc


Alcohol would have given a more accurate reading with this method, since alcohol does not “dome” like water.
 

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Brokedick Millionaire
Joined
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40,313 Posts
a few drops of dish soap breaks the surface tension of the water so it doesn't dome as much, also need a piece of lexan with a hole drilled...
 

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DIY Guru
96 Ranger-stock
Joined
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637 Posts
Discussion Starter #5
The dish soap I did not know Thanks for the tip

Lexan... you mean like the one in the first pic?
 

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DIY Guru
96 Ranger-stock
Joined
·
637 Posts
Discussion Starter #7
Well all is forgiven then!

may want to get a new pair of glasses too!
 
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