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Author
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Topic: Decoding my 351
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catman_45
Journeyman Posts: 54
From: Moscow, ID, USA
Registered: Jan 2002
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posted 03-23-2002 03:36 PM
   
Well I finally picked up my Mustang, drove it from North Dakota to Lake Havasu, AZ, and then back up to Idaho. While staring at the engine so many times, I was wondering how to tell if it is a 351 Windsor or Cleveland. The guy I bought it from said Windsor, but he owns an exhaust shop and didn't even notice the cracked exhaust manifold  Anyway, most people who saw the engine couldn't tell if it was W or C code, but the spark plugs in that beast are huge, had to use a 13/16 socket on them, and the dude at Checkers claims that it has to be Cleveland because of that, but then another mechanic (replacing my vacuum advance on the distributor) said that some Windsors had those plugs. So I was hoping for some info to help my find out for sure what the engine is. Thanks for the help.------------------
1966 Coupe w/ 351 Windsor, BM Slap shifter, aqua blue, dual exhaust with turbo mufflers
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ewokeric
Gearhead Posts: 159
From: woodbridge, va united states
Registered: Mar 2002
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posted 03-23-2002 04:19 PM
i have a 351 windsor and my spark plugs are big as well. I do remember reading in finding our what mine was is the cleveland had 14mm spark plugs not the 13/16. hope that helps
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Fastymz
Moderator Posts: 8516
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 03-23-2002 04:27 PM
If the top rad,hose gose to the intake manifold,and not the engine block.Then it's windsor.The 351w intake looks just like the 302 but is more wide.
And my 69 351w uses the large plugs too.
And both sides of my exh manifolds were cracked too.The guy cracked them both when he put the motor in my 65.SCOOP ------------------
65 coupe,Big Boss 429 hood scoop,Crager SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
[This message has been edited by Fastymz (edited 03-23-2002).]
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SteveLaRiviere
Administrator Posts: 30097
From: Saco, Maine
Registered: May 99
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posted 03-23-2002 04:28 PM
All Clevelands use 5/8" spark plug sockets. They also have 8 bolt valve covers and the thermostat housing is on the block. Also, the bolt and stud holding the fuel pump are vertical. Older 351Ws use 13/16" spark plug sockets, {newer ones use the smaller plugs, I'm not sure of the year it switched} have 6 bolt valve covers, the thermostat housing is on the intake manifold, and the bolts holding the fuel pump are horizontal. ------------------
'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
MCA Member # 47773 I love being married. It's so great to find that one special person you want to annoy for the rest of your life.
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catman_45
Journeyman Posts: 54
From: Moscow, ID, USA
Registered: Jan 2002
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posted 03-24-2002 12:48 AM
Ok, thanks for the info guys, my engine is a Windsor. I got her up to 110 before I got scared in New Mexico. Can't wait to tear her apart.------------------
1966 Coupe w/ 351 Windsor, BM Slap shifter, aqua blue, dual exhaust with turbo mufflers
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