Ford V8 Flathead Bearing Specifications

Standard Specs for Crankshaft & Connecting Rod Journals

Use the following table to check the original standard bearing journal specifications for wear. If the engine has been overhauled and the bearings replaced, it may have had undersize bearings installed. These are usually marked with the undersize on the back side of the bearing. For instance, if the crankshaft main bearing journals were ground down ten thousandths of an inch, the replacement bearings would be marked ".010" on the back side.

Engines manufactured before the late style 1949 (or the 1948 trucks) had the "floating" style rod bearings. These were not keyed to the rods but could float and rotate freely between the rod opening and the rod journal on the crankshaft. Since they have a bearing surface on both sides, there are no markings on them, and they would have to be checked with a micrometer for clearance. Check bearing journals with a quality micrometer. Take four measurements on each journal (checking side to side and also checking 90 apart on rotation). 

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Model Year

Crankshaft Overall Length

Main Bearing
Journal
Connecting Rod
Journal
1937 Ford 60hp 20.82" 1.9990" 1.5990"
1938 Ford 60hp 20.82" 1.9990" 1.5990"
1939 Ford 60hp 20.82" 1.9990" 1.5990"
1940 Ford 60hp 22.88" 2.0990" 1.6990"
       
1932 Ford 65hp (babbit type) 24.47" 1.9990" 1.9990"
1933 Ford 75hp (babbit type) 24.47" 1.9990" 1.9990"
1934 Ford 85hp (babbit type) 24.47" 1.9990" 1.9990"
1935 Ford 85hp (babbit type) 24.47" 1.9990" 1.9990"
1936 Ford 85hp (babbit type) 24.47" 1.9990" 1.9990"
1936 Ford 85hp LB (insert type) 24.47" 2.3990" 1.9990"
1937 Ford   85hp 24.47" 2.3990" 1.9990"
1938 Ford   85hp 24.47" 2.3990" 1.9990"
1939 Ford   85hp 26.03" 2.4990" 1.9990"
1940 Ford   85hp 26.03" 2.4990" 1.9990"
1941 Ford   90hp

26.03"

2.4990" 1.9990"
1942 Ford   90hp 26.03" 2.4990" 1.9990"
1946 Ford 100hp 26.03" 2.4990" 2.1390"
1947 Ford 100hp

26.03"

2.4990" 2.1390"
1948 Ford 100hp 26.03" 2.4990" 2.1390"
1949 Ford 100hp 26.03" 2.4990" 2.1390"
1950 Ford 100hp

26.03"

2.4990" 2.1390"
1951 Ford 100hp 26.03" 2.4990" 2.1390"
1952 Ford 110hp 26.03" 2.4985" 2.1390"
1953 Ford 110hp

26.03"

2.4985" 2.1390"
       
1939 Mercury   95hp 26.03" 2.4990" 2.1390"
1940 Mercury   95hp 26.03" 2.4990" 2.1390"
1941 Mercury 100hp

26.03"

2.4990" 2.1390"
1942 Mercury 100hp 26.03" 2.4990" 2.1390"
1946 Mercury 100hp 26.03" 2.4990" 2.1390"
1947 Mercury 100hp

26.03"

2.4990" 2.1390"
1948 Mercury 100hp 26.03" 2.4990" 2.1390"
1949 Mercury 110hp 26.03" 2.4990" 2.1390"
1950 Mercury 110hp

26.03"

2.4990" 2.1390"
1951 Mercury 112hp 26.03" 2.4990" 2.1390"
1952 Mercury 125hp 26.03" 2.4985" 2.1390"
1953 Mercury 125hp

26.03"

2.4985" 2.1390"

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