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Old 10-17-2003, 11:11 PM
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help on simple 351w Questions

when you guys talk about the 351 how do you know if its a w ,c, or whatever... but ive read around the board that if its modified its called a 351M? modified internal or externaly? does it matter?

i got a 351 i dont know if its modfied internaly.i dont think it is. the guy who sold it to me said it was a 351w.....but my question is.... its got a k&n filter,edlbrock performer intake, edelbrock carb, msd coil ,and msd spark plugs. dual exhaust flowmasters........IS it called a 351windsor still. or a 351m????????

also now that i told you what ive got...what should be the igniton timming on it....
the cars running like **** right now...i had a friend set the timing at 10* and set the idle at about 850rpms but it still ran like ****,,,and i drove it later on that day, and when i would stop at a stop sign or a light signal and idle about 20-30 seconds it sounds like it wants to turn off so i put in on netruel and give it a little gas.. so it wont turn on so when the light turns green i put in on drive and take off....but when i take off it takes off like it wants to turn off..... i just want it to run ok and not worry about turning off on me.
i dont want to modifled the engine anymore i just want this car to be my weekend nightriderif you know what i mean. thanksany advice would be great

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Old 10-17-2003, 11:30 PM
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Well, the 351w is called a "windsor". I believe because it was make in the Windsor Ontario Canada Ford factory. Its very similar to the 289/302 in size and appearance. If will have rather tall, narrow valve covers and the thermostat housing sticks straight out the front of the intake.

The 351c or 351m ( c is for Cleveland and m is for Modified) is in a class by itself. The "c" and "m" engines will have a rather shorter and wider and fatter valve cover and the thermostat housing sticks straight up out of the time cover area, directly in front of the intake manifold. ( if my memory serves me correctly anyway! LOL)

As far is it not wanting to idle, it could by caused by lots of different or combined problems. You may be better off taking it to a good shop and having it checked over good for things like compression, vacuum leaks, carb problems, ign problems and so on. Maybe thats why the guy sold the car to begin with! LOL Who knows.


Read up on the 351s here.

and here too.

Last edited by Jmark; 10-17-2003 at 11:42 PM.
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Old 10-17-2003, 11:32 PM
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The 351W (Windsor) is a smallblock is just like a 302 or 5.0 with a raised deck.

The 351C (CLeveland) is a midsized block. The Cleveland heads can were used on the 302 to make a BOSS 302.

The 351M is a midsized block that can use Cleveland heads as well.

Your timing should be at 34o to 36o total. Clean your plugs and tune your carb with a vacuum guage.
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Old 10-17-2003, 11:37 PM
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easiest way i know of to tell them apart, is the W has the h20 inlet cast as part of the intake manifold, the C and M blocks have the h20 inlet directly on the block.

351 M is a 400 destroked to a 351. shares some components with the C.

a W will never be a M. or a C. no one is really sure what the M stands for.

the W is in the same family as the 289, and 302. the 351 has a taller deck height.
the C and M are in the same family.
different blocks totally.
don't have the timing specs handy..... sorry.
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