Oldsmobile 303 Rocket V8

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

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