(Hercules) Models A & B are 4 cylinders.  All the rest are 6 inline cylinders.

Model HP MAX RPM IDLE RPM Bore Inches Stroke Inches C.R. C.I.D. Block Model Intake Valve Exhaust Valve Comments

A 60 3200 500 3 1/4 4 6.8 132.7 LXBR5W 0.010 0.010

B 60 3200 500 3 1/4 4 6.8 132.7 LXBR5W 0.010 0.010

H 75 3200 500 3 1/4 4 1/8 6.5 205.3 QXB 0.010 0.014

HA 85 3500? 500 3 1/4 4 1/8 6.5? 205.3 QXB 0.010 0.014

K3 3/8 85 3200 500 3 3/8 4 1/8 6.2 221.4 QXC5M 0.010 0.012

1937 to 1939 KA 95 3500 500 3 3/8 4 1/8 ? 221.4 QXC5M 0.010 0.012

1937 to 1939 K3 7/16 95 3200 500 3  7/16 4 1/8 7.2 229.7 QXD5M 0.010 0.012

1940 to 1958 K 100 3200 500 3  7/16 4 1/8 7.6 229.7 QXD5M 0.010 0.014

1959 to 1963 KL 105 3200 500 3  7/16 4 1/4 7.4 236.6 QXLDML 0.010 0.014

1949 tp 1960 KLC 120 3800 650 3  7/16 4 1/4 7.0 236.6 QXLDMB 0.010 0.014

1951 to 1956 KB 121 3800 650 3  7/16 4 1/8 7.5 229.7 QXD5M 0.010 0.014

1937 to 1947 KBL 131 3800 750 3  7/16 4 1/4 7.0 236.6 QXLDMB 0.010 0.014

1948 to 1956 KFL 131 3800 600 3  7/16 4 1/4 7.4 236.6 QXLDMB 0.010 0.016

1957 to 1960 L 110 3200 500 3 5/8 4 1/4 7.5 263.3 JXBM 0.010 0.018

M 130 3000 500 4 4 1/4 7.0 320.4 JXDMM 0.010 0.018

ML 145 3000 500 4 4 1/2 7.3 339.2 JXLDML 0.010 0.018

MB 145 3400 500 4 4 1/4 8.0 320.4 JXDM 0.010 0.018

MBL 158 3400 700 4 4 1/2 7.3 339.4 JXLDMB 0.010 0.018

MCL 175 3400 500 4 4 1/2 7.2 339.4 JXLDMCL 0.010 0.018

W 160 3000 500 4 1/4 4 3/4 6.4 404.3 CWC 0.010 0.018

WB 200 3200 500 4 1/4 4 3/4 6.9 404.3 CWC? 0.012 0.018