which 351?
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New User
Joined: Nov 2004
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which 351?
new to fords. just bought my kid a 77 ford f150 has a 351. how do i tell if its a351 modified or 351 winsor or cleveland. and what is the prefered timing for this truck and motor thanks jc
Senior User
Joined: Feb 2004
Posts: 379
Likes: 1
From: Delavan, IL
Motor
You have a 351M (Modified, Midland, Mexican, blah blah blah). There's a very slim chance that somebody put a 351W in, replacing an I-6 or 302. If the water outlet (thermostat housing) is bolted on the end of the intake, then it's a Windsor. If it's on the top, then it's a Modified. As for timing....I would pick up a Chiltons or Haynes manual at your local auto parts store.
Best of luck to you and your son. The old Fords are the only way to ride.
Best of luck to you and your son. The old Fords are the only way to ride.
More Turbo
Joined: Mar 2002
Posts: 606
Likes: 3
From: Colstrip, MT
The 351M thermostat housing goes on top of the block, not on top of the intake maifold. Also, there is difference in the fuel pump mounting bolts. The 'W' fuel pump bolts are mounted horizontally, and the 'M' bolts are mounted vertically.
Posting Guru
Joined: Mar 2003
Posts: 1,253
Likes: 2
From: spartanburg, SC
it could have a 400 in it too. you can't tell the 351M and 400 apart from looking at the outside.
4th letter in VIN
S=400
H=351M
G=302
B=300 I6
preferred timing is 2° less than what it spark knocks at warmed up. back it off some if it starts slow.
-EDIT- You can make that little degree mark by holding down the ALT key and typing 248 on the numeric keypad. The ° will appear when you let up on the ALT key. -Admin
4th letter in VIN
S=400
H=351M
G=302
B=300 I6
preferred timing is 2° less than what it spark knocks at warmed up. back it off some if it starts slow.
-EDIT- You can make that little degree mark by holding down the ALT key and typing 248 on the numeric keypad. The ° will appear when you let up on the ALT key. -Admin
Last edited by F150daniel; Nov 19, 2004 at 02:11 PM.
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New User
Joined: Nov 2004
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351 motor
thanks guys the motor endedup being a 351 windsor. found acouple of screwed up things the had the wrong gasket between the manifold and the carb plate and also there was no timing tab had to set it by ear. but sounds and runs better. although this engine is extremly slow to warmup in the mornings wants to bog down if you give it any gas. any suggetions here. has a 2 barrell carb
Posting Guru
Joined: Mar 2003
Posts: 1,253
Likes: 2
From: spartanburg, SC
Is the accel pump working? with the ignition off look down the carb and open the throttle, you should see two streams of fuel hit the boosters.
the way i make the ˚ is hold ALT/ option key and press K.
-EDIT- unfortunately that does not always display a °, it displays a " or some other character. The ALT-K method only works in some programs. -Admin
the way i make the ˚ is hold ALT/ option key and press K.
-EDIT- unfortunately that does not always display a °, it displays a " or some other character. The ALT-K method only works in some programs. -Admin
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Elder User
Joined: May 2004
Posts: 553
Likes: 0
From: Ont. Can.
Before you start screwing with the carb your bog could still be timing when you are doing it on a guess
Mine will do this as well if the timing is not quite right but it will idle and run like a charm otherwise . Good Luck to the young lad with his Ford Truck.
Mine will do this as well if the timing is not quite right but it will idle and run like a charm otherwise . Good Luck to the young lad with his Ford Truck.
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