year of introduction: 1949
last year offered: 1953
horsepower: 135 @ 3600 R.P.M., 145 @ 3600 R.P.M., 160 @3600 R.P.M. depending on year and model
torque: 263 ft./lbs. @ 1800 R.P.M.
true displacement: 303.7 cubic inches
firing order: 1-8-7-3-6-5-4-2, driver side odd, passenger side even
spark plug gap: .030″
point gap: .016″
idle speed: 400-425 R.P.M.
cylinder angle: 90 degrees
cylinder bore: 3.75″
crank stroke: 3.4375″
compression ratio: 7.25:1
compression pressure: 120 P.S.I.
piston ring gap: .008″-.010″
piston wrist pin diameter: .9803″-.9807″
connecting rod journal diameter: 2.2488″-2.2498″
connecting rod torque: 45 ft./lbs.- 50ft./lbs.
main bearing journal diameter: 2.498″-2.499″, except #5 which is 2.623″-2.624″
main bearing torque: 100 ft./lbs., except # 5 which is 140ft./lbs.
cylinder head bolt torque: 65 ft./lbs.- 70 ft./lbs.
valve seat angle: 45 degrees
valve spring pressure: 141 lbs. at 1.5″ compression
