[hunting4bear]

one thing i didnt mention last post ... a buddy had same thing going on with a truck he had some one told him he had a 302 in it but turned out to be a 351 it would start and run rough with wires in position using 302 firing order ( go figure huh )

first find #1 position on dist cap this wire goes to passengers side front cylinder and going counter clock wisefor wires for firing order

if firing order of plugs ( mirror image of what you typed 1-8-4-5-6-2-7-3 ) 1-3-7-2-6-5-4-8 then motor is a 351 ( this all assumes motor runs fine )

if motor runs rough then try the following 302 firing order from #1 on cap again counter clockwise rotation 1-5-4-2-6-3-7-8

one other thing you can also check for on the motor for a number ... on the cyclinder heads themselves look for casting markings as follows if there is a cast number IE D5AE-A*-*** similar to these below then motor is a 351 or has 351 heads on it and the m series motors were used across alot of applications from 1971 to 1979 in midsize and full size cars and trucks and later 77 to 82 broncos

D5AE-AA ('77-later 351M/400, CF mark) 76.9cc chamber heads

D5AE-AA ('77-later 351M/400, MCC mark) 78.4cc chamber heads

D5AE-A2A ('77-later 351M/400) 74.5cc chamber heads

D5AE-A3A ('77-later 351M/400) 74.5cc chamber heads


ok i think thats tosses enough additional confusion out there for now good luck hotrod :-)