Engine Classes

Letter Cubic Inch Displacement Approximate Liter Equiv.
AA 501 cid and over 8.21 liters and over
A 440 thru 500  7.21 to 8.19
B 373 thru 439 6.11 to 7.19
C 306 thru 372 5.01 to 6.10
D 261 thru 305 4.27 to 5.00
E 184 thru 260 3.01 to 4.26
F 123 thru 183 2.01 to 3.00
G   93 thru 122 1.51 to 2.00
H   62 thru 92 1.01 to 1.50
I   46 thru 61 0.76 to 1.00
J   31 thru 45 0.51 to 0.75
K   30 cid and under 0.50 and under