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Old 02-20-2003, 05:38 PM   #1 (permalink)
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I was under the impression the biggest engine that will fit in between the shock towers of a 65 Mustang was the 302 cubic inch motor. I was recently told some 351 cubic inch motors will fit, but the guy wass not sure wich ones do (i.e. 351W or 351C) Can someone please clarify this? Please help before I do something stupid like buy a mmotor that will not fit. Thanks.
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Old 02-20-2003, 05:40 PM   #2 (permalink)
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351w will
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Old 02-20-2003, 05:46 PM   #3 (permalink)
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351w or 351c fit in the 65-6 mustang engine bay.
There is lightly more room with the w.....but the c is just sooooooooo cool since soooooo many people still swear up and down it doesn't fit [IMG]/forums/images/icons/smile.gif[/IMG]

Then you open the hood and watch them drool....
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Old 02-20-2003, 05:50 PM   #4 (permalink)
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What's the real difference anyway...the heads?
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Old 02-20-2003, 05:55 PM   #5 (permalink)
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Completely differnet engine family.
289/302/351w are all memeber of the 90degree v SBF family and have more incommon with each other than the 351w and 351c.

The 351c is a member of the 335 series....yes the heads are a large part of the difference, but it also runs a dry intake, shorter deck, etc......
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Old 02-20-2003, 06:02 PM   #6 (permalink)
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You guys are BOSS! Thanks! 2 more quick questions. Is there a way to identify the difference? I've heard something of the valve covers, but got mixed up. (actually not paying attention because I really did not think the 351 would work) Also questions regarding motor mount brackets. Will I need some from a later model Mustang with a 351, or will I be able to use the ones for the 302?
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Old 02-20-2003, 06:06 PM   #7 (permalink)
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Well.....the 351w has 6 bolts on the vavle covers
and the 351c has 8, but then you also need to worry about if it is a 351m which is the equivilant of a boat anchor IMO [IMG]/forums/images/icons/smile.gif[/IMG]

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Old 02-20-2003, 06:32 PM   #8 (permalink)
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The W has the thermostat in the front of the intake

The C has the thermostat in the front of the top of the block.
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Old 02-20-2003, 06:48 PM   #9 (permalink)
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Here is some good info as well:

http://www.karmustang.com/identifyin...or_and_351.htm

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Old 02-20-2003, 06:51 PM   #10 (permalink)
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I was looking for that page...I used to have it bookmarked, then I lost all my bookmarks [IMG]/forums/images/icons/wink.gif[/IMG]
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Old 02-20-2003, 07:13 PM   #11 (permalink)
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The windsor will bolt right in without any problem. If your shock towers are perfectly upright and you can find special headers, the cleveland will go in with absolutely nothing to spare. You really need to notch the shock towers or use Crites motor mounts for a cleveland.
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Old 02-20-2003, 07:53 PM   #12 (permalink)
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A friend put a drivetrain from a cougar eliminator (mercury BOSS351) into a 71 Maverick which doesn't have anymore space than your 65. It ran great but required 3 extensions, 2 ujoints, and jacking up the motor slightly to change the spark plugs. He eventually redid the shock towers which made it managable.

If you are looking at a 351C and want to make sure it isn't a 351M, look at the bellhousing bolt pattern. 351C is the same as a 302, 351M is the same as a 429/460. Basically look at the two bolt holes at the top of the block. If you can put your thumb on one and your little finger on the other easily (about 4-5inches) it's a Cleveland. If you have to really stretch your hand (about 9 inches), it's an M.
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Old 02-20-2003, 08:37 PM   #13 (permalink)
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One last thing, the 351W is a little wider than the 289/302, so you will need special headers. You can buy them at Summit among other places.
How come nobody mentioned that the biggest you can strok the 289/302 to is 347.
BUT, the 351W can go all the way to 427
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Old 02-21-2003, 11:04 AM   #14 (permalink)
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Hello. both engines will fit into the car , but the cleveland is tighter. this is sort of inconvenient when you change the plugs.you also will need to change out the breather .unless you have a scoop on the hood , the stock mustang breather will hit the hood when you close it.have fun shoe-horning it in there!
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