I was told its a bored out 302 to a 351, how can I know? - Ford Mustang Forum
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post #1 of 24 (permalink) Old 04-12-2009 Thread Starter
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I was told its a bored out 302 to a 351, how can I know?

Got a great deal on an 84. It was for sale at $5,800 and a potential buyer took it for a test drive, brought it back and left it running while he was writing the check to my brother in law. All of the sudden the wiring harness started smoking and the car died. It would not start after that happened and the guy took his check back. It sat for almost a year and at thanksgiving dinner I offered $1,200 for it just fishing for a price on it and my sister MADE him sell it (bless her heart). I bought a battery, a can of starting fluid, loaded up my toolbox and went to get it. One loose wire and half an hour later it thundered to life. Automatically i could tell it was no stock 302 and when i asked was told it was a 351c. well that raised more questions and with more that came more answers. confusing ones. I was told it is the original 302 bored to a 351. I need to know what i have. And what ever happened to it when the wires were smoking created a problem that i just cannot hunt down. It runs great to 3,000 rpm's and then just completely craps out. Backfires, blows flames out the carburetor, looses all power, and it has got me baffled. can someone help me please.
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post #2 of 24 (permalink) Old 04-12-2009
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Quote:
Originally Posted by fraga320 View Post
Got a great deal on an 84. It was for sale at $5,800 and a potential buyer took it for a test drive, brought it back and left it running while he was writing the check to my brother in law. All of the sudden the wiring harness started smoking and the car died. It would not start after that happened and the guy took his check back. It sat for almost a year and at thanksgiving dinner I offered $1,200 for it just fishing for a price on it and my sister MADE him sell it (bless her heart). I bought a battery, a can of starting fluid, loaded up my toolbox and went to get it. One loose wire and half an hour later it thundered to life. Automatically i could tell it was no stock 302 and when i asked was told it was a 351c. well that raised more questions and with more that came more answers. confusing ones. I was told it is the original 302 bored to a 351. I need to know what i have. And what ever happened to it when the wires were smoking created a problem that i just cannot hunt down. It runs great to 3,000 rpm's and then just completely craps out. Backfires, blows flames out the carburetor, looses all power, and it has got me baffled. can someone help me please.

u cant boar a 302 to a 351, but u can stoke it out, if its a 350 it will have a deeper crank, and new pistons. may be taken out 30 ish over.


only way to tell is to measure cyl walls, then measure stroke and add it up


if u can get those go to download.com search virtual engine calculator

and put them in and ull get ur disp... unless anyone else knows an easyer way
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post #3 of 24 (permalink) Old 04-12-2009
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lol sorry i had to. well u cant figure everything out on ur own so y not take it to shop have em tell ya whats wrong and then diy
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post #4 of 24 (permalink) Old 04-12-2009
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well if its a 351 cleveland you can tell by the heads & valve covers
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post #5 of 24 (permalink) Old 04-12-2009
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not with just boring...

If you bore a 302 .30 in only makes it a 306ci you would have to definitely stroke it. 347 is a more common stroked 302.

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post #6 of 24 (permalink) Old 04-13-2009
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yeah could be a 351C 351W 351M <--lets hope its not an M

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post #7 of 24 (permalink) Old 04-13-2009
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You can't bore a 302 .30. You will likely bore right through the walls. You can bore one .030, but not .30. :hihi:

The formula is B*S*3.1416 * N = cu in. B is bore, S is stroke, N is number of cylinders.

4.000*3.000*3.1416*8 = 301.6 cu in

If you bore it .030 to 4.03 (about the safe max) you have:
4.030*3*3.1416*8= 303.9 cu in (303.8548415 to be nearly exact).

Clevelands are easy to tell from a Windsor, because almost everything is different. The timing chain cover is a raised edge cast onto the block front instead of bolt on, the valve covers are different, the deck height is lower than a 351W and taller than a 302. The Cleveland generally makes a poor race or street engine. It is next to impossible that they swapped in a Cleveland because they are rare now, and you should really hope they did not because they don't work well unless you want a 8000 RPM very peaky motor with no low end torque.

One thing in life is certain. When someone starts telling you conflicting nonsense stories like boring a 302 to 351 or dropping a Cleveland into a Fox body, nothing they say about the subject can be trusted.

You probably have a regular 302 or if it is a 351 it is a Windsor, which actually is the best thing. You don't want a Cleveland unless you have an old stang that had one from the factory.

Tom
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post #8 of 24 (permalink) Old 04-13-2009
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fraga, you posted this same story 1-2 months ago. you didn't find anything then?
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post #9 of 24 (permalink) Old 04-13-2009
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you also said it cost $7000 then $5800 and you paid $1200 and bought it in Jan.

i call farce

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And The Plot Thickens...
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Quote:
Originally Posted by RLG34750 View Post
And The Plot Thickens...

hope this aint another smokey88

10 pages of who knows what!
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Ok if you really want to know what your motor is without pulling it out, taking anything apart.......this will tell you if its a 302/351w, or 351c/351m-400m........take a good look at your intake look and see if the thermostate housing is located on the block right below the intake or if its located on the intake....

If your thermostate housing is located on the block its either the clevland or modified...

There is many ways to tell the difference without measuring or taking anything apart....where does the oil pressure gauge line run to on the block....some times the firing order....the modifieds and clevlands have 8 valve cover bolts, 302 and windsor have 6....I can go on and on and on these are the simple things to me easy to tell the difference between them all but to some its not so easy and my advise if you buy a car like this and dont know what your gettin into please take someone with you that knows what to look for expecially on the fox bodys and sn95's....and my advise I wouldnt use that ether on that motor its basically for diesels and you shouldnt spray much at all in a motor....

Life is to short to live it pissed off cherish who and what you got while you can!
Free speech isn’t so free when it comes to protected classes and races, is it?
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Quote:
Originally Posted by RLG34750 View Post
And The Plot Thickens...

and the guy who "sold" him the car was his brother in law maybe its dare i say..........Mercedez L

1988 T-Topped GT 5 speed
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MAF Conversion etc
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I can tell you right now just by looking at the picture of the motor on your profile by looking at the intake its not no 351c,351m-400m nor is it a 351w it either a 302 or 289 and someone has either put those pulleys on the motor or the motor came out of a different vehicle.....if you want to know a little about the block than let me know and Ill tell you how to go about it....

Life is to short to live it pissed off cherish who and what you got while you can!
Free speech isn’t so free when it comes to protected classes and races, is it?
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and the guy who "sold" him the car was his brother in law maybe its dare i say..........Mercedez L



please no..................
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