How big is the combustion chamber on a small block?
Generally, most performance small-block heads used a 64-cc combustion chamber roughly in the shape of a tub. The first major change to chambers came when emissions requirements led to increasing the size of the chamber to reduce compression and attempt to reduce the hydrocarbon count in the exhaust residue.
Why did they change the size of the combustion chamber?
The first major change to chambers came when emissions requirements led to increasing the size of the chamber to reduce compression and attempt to reduce the hydrocarbon count in the exhaust residue. This led to open chambers designed to reduce the quench area of the head, which also reduced oxides of nitrogen (NOx) emissions.
What kind of combustion chamber does a czo6 have?
This is an old 64-cc iron chamber from a 461 head—the classic “double hump” head that is still in favor with some small-block enthusiasts. While offering decent intake flow for its port size, this chamber does little to enhance combustion efficiency. This is a factory LS7 chamber for the GEN IV 505-hp small-block used in the 2006 CZO6 Corvette.
What was the combustion chamber like in the early Chevys?
In the early days of the smallblock Chevy and for all engines up to perhaps the mid-1970s, the shape of the combustion chamber was merely a tub or vessel in which to contain the valves. Little attention was given to the early small-block chambers other than the chamber volume’s affect on compression ratio.
Generally, most performance small-block heads used a 64-cc combustion chamber roughly in the shape of a tub. The first major change to chambers came when emissions requirements led to increasing the size of the chamber to reduce compression and attempt to reduce the hydrocarbon count in the exhaust residue.
The first major change to chambers came when emissions requirements led to increasing the size of the chamber to reduce compression and attempt to reduce the hydrocarbon count in the exhaust residue. This led to open chambers designed to reduce the quench area of the head, which also reduced oxides of nitrogen (NOx) emissions.
This is an old 64-cc iron chamber from a 461 head—the classic “double hump” head that is still in favor with some small-block enthusiasts. While offering decent intake flow for its port size, this chamber does little to enhance combustion efficiency. This is a factory LS7 chamber for the GEN IV 505-hp small-block used in the 2006 CZO6 Corvette.
In the early days of the smallblock Chevy and for all engines up to perhaps the mid-1970s, the shape of the combustion chamber was merely a tub or vessel in which to contain the valves. Little attention was given to the early small-block chambers other than the chamber volume’s affect on compression ratio.