There were several different configurations produced over the years, ranging from about 150cc's to as much as 185cc's.
1973 350 Corvette. 76cc chambers. 2.02`` intake valves 1.6`` exhaust valves.
a Chevy 202 head, is a fuely head with a 202 intake valve
From the front of the head it's EIIEEIIE. This is the same on both sides - (I=Intake, E=Exhaust) With the valve covers off the rocker that aligns with the exhaust port is the exhaust the other will align with the intake manifold runner this would be your intake
The intake valves are bigger.
58cc
Under the rocker cover.
A small or big block Chevy have a casting number on the top of the block behind the driver side head. MorTec has Chevy casting numbers listed online.
write down the casting number under the valve cover and compare it to the list of chevy head castings at mortec.com
1.94 intake and 1.50 exhaust
Remove the valve cover and you will see it stamped into the top of the head.
1970-71 Chevrolet Small Block 400cid heads.
casting numbers are on the back of the block. there are numbers on the pad by the head on passenger side front that will reveal information too