Difference between 302 and 351w

[inou2]

Anyone know the best way to ID a 351w vs. a 302 roller block. I bought a project car (64 Falcon pro street). It's one these projects that has changed hands a bunch, and I don't have much info on it. I need to replace the oil pan, and it has a rear sump pan to allow clearance for a MII rack. I can't find a rear sump for a 302, and thought it could be a 351w. I'm finding lot's of rear sump pans for the 351w. It is a true rear sump, not like a late model stang with the dual sump pan. Any help would be appreciated. Thanks!

 

[9 Deuce GT]

Look at the width between heads. A 351w will be noticebly wider. Or pull the intake. A 351w will have 351w sstamped into the lifter valley.

 

[tjm73]

The fastest way to tell the two apart is by looking at the block by the distributor base. If the block is flat to where the intake manifold bolts down, it's a 302. If there is a lip of block that goes up to the where the intake is bolted down it's a 351. On the 351W the distributor looks kinda like it is sunken down a little bit.