Chev engine identification

[Dave Newcomb]

Hi; Commonly 261's had II or "Captain's bars" casting marks on the block just above the starter. Also the later ones had full flow oil ports 1/2" NPT in the oil galleries on the intake side. These should be allowed to move oil... not blocked off with plugs. Local rebuilders have informed me that the Chev 6's are cam timed 6 degrees retarded and they use a 4 degree offset crankshaft key to reduce this to 2 a degree cam retard.. wakes up the engines. Canadian 261's were sometime found in Pontiacs [ Parisene?] Highest comp head is the '58 & later 848 casting. Dave