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Home >> Cadillac >> 1977 >> Seville >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 260" OLDSMOBILE, 350" CADILLAC 350"(VIN Code R) & 403" BUICK, OLDSMOBILE & PONTIAC >> Engine Specifications

Engine Specifications

GENERAL SPECIFICATIONS

Engine Net HP At RPM Torque (Ft. Lbs. at RPM) Compr. Ratio Bore Stroke Displ. Cu. Ins.
260" V8 ..... ..... 8.0:1 3.500" 3.385" 260"
350" V8 ..... ..... (1) 8.5:1 4.057" 3.385" 350"
403" V8 ..... ..... 8.5:1 4.351" 3.385" 403"
(1) 8.25:1 compression ratio is used on Seville.
VALVES

Engine & Valve Head Diam. Face Angle Seat Angle Seat Width Stem Diameter Stem Clearance Valve Lift
260"              
  Int. 1.522" 44° 45° .037-.075" .3425-.3432" .0010-.0027" .....
  Exh. 1.300" 30° 31° .050-.090" .3420-.3427" .0015-.0032" .....
350"              
  Int. 1.875" 44° 45° .037-.075" .3425-.3432" .0010-.0027" .....
  Exh. 1.502" 30° 31° .050-.090" .3420-.3427" .0015-.0032" .....
403"              
  Int. 1.995" 44° 45° .037-.075" .3425.3432" .0010-.0027" .....
  Exh. 1.502" 30° 31° .050-.090" .3420-.3427" .0015-.0032" .....
PISTONS, PINS, RINGS

Engine PISTONS PINS RINGS
Clearance Piston Fit Rod Fit (1) Ring End Gap Side Clearance
All .001-.002" .0003-.0005" .0008-.0018" Top .010-.023" .0020-.0040"
        No. 2 .010-.023" .0020-.0040"
        Oil .015-.055"  
(1) Interference fit.
CRANKSHAFT MAIN & CONNECTING ROD BEARINGS

Engine MAIN BEARINGS CONNECTING ROD BEARINGS
Journal Diam. Clearance Thrust Bearing Crankshaft Endplay Journal Diam. Clearance (1)Sideplay
260", 350" & 403" 2.4990" (2) .0005-.0021" (3) No. 3 .004-.008" 2.1243" .0004-.0033" .006-.020"
(1) Total 2 rods.
(2) No. 1 is 2.4993"
(3) No. 5 is.0015-.0031"
VALVE SPRINGS

Engine Free Length PRESSURE (LBS.)
Valve Closed Valve Open
260", 350" & 403" 1.96" 76-84 @ 1.670" 180-194 @ 1.270"
CAMSHAFT

Engine Journal Diam. Clearance (1) Lobe Lift
All 2.0357-2.0365" (2) .0020-.0058" ..........
(1) End play -.011-.077"
(2) Each succeeding journal.020" smaller than preceding journal.