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Top : Buick Resource : Production Information : 1940's :
1940's Engine Specifications

Year Model Designation Wheel
base
Inches
Valve
Location
Bore and Stroke Piston
Dis
place
ment
Cubic
Inches
Com
pres
sion
Ratio
(Stand
ard)
Maximum
Brake
H.P.
@
R.P.M.
Spark
Plug
Gap
Point
Gap
Firing
Order
Ignition
Timing
BTDC or
Mark
1940 Special 8 40-40 121 In Head 3 3/32 x 4 1/8 248.0 6.1 107 @ 3400 .025 .015 16258374 ADV mark
Super 8 40-50 121 In Head 3 3/32 x 4 1/8 248.0 6.1 107 @ 3400 .025 .015 16258374 ADV mark
Century 8 40-60 126 In Head 3 7/16 x 4 5/16 320.2 6.25 141 @ 3600 .025 .015 16258374 ADV mark
Roadmaster 8 40-70 126 In Head 3 7/16 x 4 5/16 320.2 6.25 141 @ 3600 .025 .015 16258374 ADV mark
Limited 8 40-80 133 In Head 3 7/16 x 4 5/16 320.2 6.25 141 @ 3600 .025 .015 16258374 ADV mark
Limited 8 40-90 140 In Head 3 7/16 x 4 5/16 320.2 6.25 141 @ 3600 .025 .015 16258374 ADV mark
1941 Special 8 41-40A 118 In Head 3 3/32 x 4 1/8 248.0 6.5 115 @ 3500 .025 .015 16258374 ADV mark
Special 8 41-40B 121 In Head 3 3/32 x 4 1/8 248.0 7.0 125 @ 3800 .025 .015 16258374 ADV mark
Super 8 41-50 124 In Head 3 3/32 x 4 1/8 248.0 7.0 125 @ 3800 .025 .015 16258374 ADV mark
Century 8 41-60 126 In Head 3 7/16 x 4 5/16 320.2 7.0 165 @ 3600 .025 .015 16258374 ADV mark
Roadmaster 8 41-70 126 In Head 3 7/16 x 4 5/16 320.2 7.2 165 @ 3800 .025 .015 16258374 ADV mark
Limited 8 41-90 139 In Head 3 7/16 x 4 5/16 320.2 7.2 165 @ 3800 .025 .015 16258374 ADV mark
1942 Special 8 42-40A 118 In Head 3 3/32 x 4 1/8 248.0 6.0 115 @ 3500 .025 .015 16258374 ADV mark
Special 8 42-40B 121 In Head 3 3/32 x 4 1/8 248.0 6.3 125 @ 3800 .025 .015 16258374 ADV mark
Super 8 42-50 124 In Head 3 3/32 x 4 1/8 248.0 6.3 125 @ 3800 .025 .015 16258374 ADV mark
Century 8 42-60 126 In Head 3 7/16 x 4 5/16 320.2 6.7 165 @ 3800 .025 .015 16258374 ADV mark
Roadmaster 8 42-70 129 In Head 3 7/16 x 4 5/16 320.2 6.7 165 @ 3800 .025 .015 16258374 ADV mark
Limited 8 42-90 139 In Head 3 7/16 x 4 5/16 320.2 6.7 165 @ 3800 .025 .015 16258374 ADV mark
1946 Special 8 46-40 121 In Head 3 3/32 x 4 1/8 248.0 6.3 110 @ 3600 .025 .015 16258374 ADV mark
Super 8 46-50 124 In Head 3 3/32 x 4 1/8 248.0 6.3 110 @ 3600 .025 .015 16258374 ADV mark
Roadmaster 8 46-70 129 In Head 3 7/16 x 4 5/16 320.2 6.6 144 @ 3600 .025 .015 16258374 ADV mark
1947 Special 8 47-40 121 In Head 3 3/32 x 4 1/8 248.0 6.3 110 @ 3600 .025 .015 16258374 ADV mark
Super 8 47-50 124 In Head 3 3/32 x 4 1/8 248.0 6.3 110 @ 3600 .025 .015 16258374 ADV mark
Roadmaster 8 47-70 129 In Head 3 7/16 x 4 5/16 320.2 6.6 144 @ 3600 .025 .015 16258374 ADV mark
1948 Special 8 48-40 121 In Head 3 3/32 x 4 1/8 248.0 6.3 110 @ 3600 .025 .015 16258374 ADV mark
Super 8 48-50 124 In Head 3 3/32 x 4 1/8 248.0 6.6 115 @ 3600 .025 .015 16258374 ADV mark
Roadmaster 8 48-70 129 In Head 3 7/16 x 4 5/16 320.2 6.6 144 @ 3600 .025 .015 16258374 ADV mark
Roadmaster 8 (DYN) 48-70 129 In Head 3 7/16 x 4 5/16 320.2 6.9 150 @ 3600 .025 .015 16258374 ADV mark
1949 Special 8 49-40 121 In Head 3 3/32 x 4 1/8 248.0 6.3 110 @ 3600 .025 .015 16258374 ADV mark
Super 8 49-50 121 In Head 3 3/32 x 4 1/8 248.0 6.6 115 @ 3600 .025 .015 16258374 ADV mark
Super 8 (DYN) 49-50 121 In Head 3 3/32 x 4 1/8 248.0 6.9 120 @ 3600 .025 .015 16258374 ADV mark
Roadmaster 8 49-70 126 In Head 3 7/16 x 4 5/16 320.2 6.9 150 @ 3600 .025 .015 16258374 ADV mark


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