I believe that is 10 degrees BTDC
There are different ways. One is that the 351w fuel pump bolts to the timing cover,the 351c bolts to the engine block. Water flows through the 351w intake manifold and does not on the 351c. The 351w has inline valves and the 351c has canted valves. The 351w has squared intake ports and the 351c has huge round ports. Hope this helps some.
Sounds like the timing is off or you have a bad distributor.
need to know about the procedure for base timing on ef ford thank you
10 degrees BTDC ( unless the engine compartment decal shows different )
6 degrees BTDC
The simple difference between the 302 and 351w is simply deck height. The 351w is taller. They share a majority of interchanging components. Both the 302 and the 351w have a water cooled intake meaning a water bypass hose between the water pump and intake. The 351m would have an aircooled intake meaning no bypass hose. Also the head design of a 351m would make the engine look a lot larger (wider) than the 302/351w
I believe that it is a non-interference engine which is good for you. This is a complicated procedure, so I would start by getting the manual for your car, then a friend who has a timing gun , and who has set a car's timing before.
www.motorcraft.com shows the ignition timing for a 1986 F150 351 - W code - as 10 degrees BTDC ( information on the underhood sticker overrides ) with automatic transmission ( manual transmission setting is not shown )
1,8,5,3,6,5,7,2
Anything ispossible I ones swap a 351W to a Strait 6 Cyl.
no 351w's have 3" main bore size....and 302's have 2.5" mains