Engine year and origin
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Freshman User
Joined: Jan 2009
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Engine year and origin
Greetings, I just purchased an 84 F150 with a 351 and an auto trans, haven't crawled under her yet to see which trans it has. My question, and I have done a search with no results, how do I identify the engine it has now? The PO bought it with the engine swapped from another vehicle and wasn't sure which it came from. All he could tell me is that it was still a 351 with a two barrel carb. It has a distributor that has the coil in the cap, and I'm pretty sure that is not what was stock in an 84. Any help in identifying this engine model or year would help greatly in being able to get the settings needed to make it run well. The PO didn't know the settings so he timed it by ear and it has what I suspect are numerous vacuum leaks since it idles very rough. Thanks ahead of time if anyone can help me out here.
Moderator
Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
I suspect it's a 351W since the 351M was last used in 81 or 82. Count the number of bolts
holding the valve covers on; 6 = 351W, 8=351M. I don't know where the casting IDs are on
that engine but I'm sure somebody here knows, and you can also post your question in the
smallblock forum:
https://www.ford-trucks.com/forums/forum55/
The casting IDs should tell you the date the block was cast, there should be such IDs on
the heads, too (prolly under the valve covers). I don't know if there were ID numbers telling
if the Windsor was built for a truck or car the same way the M-blocks are differentiated,
you'll hafta research that.
Another thing you can do is google for 'ford 351W engine identification' and you'll get a
bunch of stuff to look at.
holding the valve covers on; 6 = 351W, 8=351M. I don't know where the casting IDs are on
that engine but I'm sure somebody here knows, and you can also post your question in the
smallblock forum:
https://www.ford-trucks.com/forums/forum55/
The casting IDs should tell you the date the block was cast, there should be such IDs on
the heads, too (prolly under the valve covers). I don't know if there were ID numbers telling
if the Windsor was built for a truck or car the same way the M-blocks are differentiated,
you'll hafta research that.
Another thing you can do is google for 'ford 351W engine identification' and you'll get a
bunch of stuff to look at.
Logistics Pro
Joined: Jun 2008
Posts: 4,990
Likes: 6
From: Florida
I suspect it's a 351W since the 351M was last used in 81 or 82. Count the number of bolts
holding the valve covers on; 6 = 351W, 8=351M. I don't know where the casting IDs are on
that engine but I'm sure somebody here knows, and you can also post your question in the
smallblock forum:
https://www.ford-trucks.com/forums/forum55/
The casting IDs should tell you the date the block was cast, there should be such IDs on
the heads, too (prolly under the valve covers). I don't know if there were ID numbers telling
if the Windsor was built for a truck or car the same way the M-blocks are differentiated,
you'll hafta research that.
Another thing you can do is google for 'ford 351W engine identification' and you'll get a
bunch of stuff to look at.
holding the valve covers on; 6 = 351W, 8=351M. I don't know where the casting IDs are on
that engine but I'm sure somebody here knows, and you can also post your question in the
smallblock forum:
https://www.ford-trucks.com/forums/forum55/
The casting IDs should tell you the date the block was cast, there should be such IDs on
the heads, too (prolly under the valve covers). I don't know if there were ID numbers telling
if the Windsor was built for a truck or car the same way the M-blocks are differentiated,
you'll hafta research that.
Another thing you can do is google for 'ford 351W engine identification' and you'll get a
bunch of stuff to look at.
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