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  #31 (permalink)  
Old 01-12-2009, 04:53 PM
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Quote:
Originally Posted by 7StangG2
Thanks for giving your opinion on this and not wondering off anywhere. Im fairly new to this, if I had owned 351w's or 302's in the past I probably wouldnt be here asking whats the difference. Maybe the pic wasnt the best, big deal. But after all im still sure its a 351. I checked the firing order and that comes back as being a 351. I gave the swap more thought and really debating just rebuilding the c4 now.. Thanks to everyone for the good information on this though.
Just a point of info...more than just the 351W had that firing order......many 302s(5.0s) do too.

You will also notice in the shot of the rear of the 302..the lower manifold surface is the same as the top of the bellhousing flange just like the front is.
Since it is apparently a bone stock engine any one of several numbers that are easily visible would also pinpoint what it is...the intake manifold has #s cast on top...the 351W would be a minimum of a C9 casting, the dist. has a number stamped on it that is easily visible, the carb has a tag, but it could have been changed( though it doesn't appear to) so there are some easy access #s that several members could taranslate for you.

Last edited by woodz428; 01-12-2009 at 05:02 PM.
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  #32 (permalink)  
Old 01-12-2009, 06:35 PM
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Quote:
Originally Posted by woodz428
Just a point of info...more than just the 351W had that firing order......many 302s(5.0s) do too.

You will also notice in the shot of the rear of the 302..the lower manifold surface is the same as the top of the bellhousing flange just like the front is.
Since it is apparently a bone stock engine any one of several numbers that are easily visible would also pinpoint what it is...the intake manifold has #s cast on top...the 351W would be a minimum of a C9 casting, the dist. has a number stamped on it that is easily visible, the carb has a tag, but it could have been changed( though it doesn't appear to) so there are some easy access #s that several members could taranslate for you.
Yes, as far as I know the 5.0 HO had that order and/or all 302's after '82 I think had the same firing order but im not sure..? I will gather all numbers you mentioned tomorrow for anyone to confirm it being a 351.. Thanks
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  #33 (permalink)  
Old 01-12-2009, 06:57 PM
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Because they look virtually identical, 351W engines (so named because they are built in the Windsor engine plant) are often mistakenly identified as a 289 or 302. In fact, the 351W is based on an entirely different block that is stouter and has greater deck height than the 289/302 (289/302 is 8.206 inches while the 351 is 9.480 inches for '69-70 and 9.503 for '71-current). However, both series of engines use the same bore spacing and the bolt patterns are the same, so 289/302/351 heads will interchange. But, because the increased deck height puts the heads further apart, the 351W requires a unique intake manifold.

Other differences between these similar-looking engines are main bearing diameters (289/302s measure 2.25 inches, 351Ws are 3 inches); slightly larger rod journals (2.1232 inches compared to 2.311 inches), and the the fact that the 351W uses a longer connecting rod (5.956 inches compared to 5.1550 inches for the 289 and 5.0900 inches for the 302).

When swapping parts between these engines, the most confusion surrounds the camshafts. Camshafts will interchange, but the 351W has a different firing order (1-3-7-2-6-5-4-8) compared to the 289/302 (1-5-4-2-6-3-7-8). Compounding the situation, the '82-and-later 302 HO engines use the 351W firing order.hope this helps.
cole
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  #34 (permalink)  
Old 01-13-2009, 07:49 AM
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Pull a valve cover - many have the engine size cast on the surface. Pull the distributor - a 351 has a 5/16" drive while a 302 has a 1/4" drive.
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  #35 (permalink)  
Old 01-13-2009, 12:12 PM
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Man, you guys are making this really really tough.

See post 20,
all you have to do is move the heater hose and look, or look on any of the 4 corners of the engine for obvious 1" or zero deck height, or as Woodz said, the rear of the block.

I have seen many many of each.
To me the picture looks like a W because of the intake manifold width, but I wouldn't bet my life on a picture, it is hard to see the 1.4 inches wider.

Here's a 5.0/302 short deck block picture. It is obvious the deck height is at the water pump boss.
I am still trying to find a tall deck picture.
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Last edited by ScoTFrenzel; 01-13-2009 at 12:26 PM.
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  #36 (permalink)  
Old 05-11-2009, 07:58 PM
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Hello...


The swap still isnt done but its getting there, just starting now. I need one thing cleared up though - flexplates. The c6 thats replacing my mustangs c4 was behind a straight six. Im not sure what year my windsor is or if it matters. But im thinking I need a 28oz 164tooth flexplate for the 351/c6 setup, from looking around at information. Can someone confirm this? Heres what I was looking at on ebay. Is this what I need? Thanks in advance.


http://cgi.ebay.com/ebaymotors/FORD-...1%7C240%3A1318
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  #37 (permalink)  
Old 05-11-2009, 08:50 PM
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Look above where the starter bolts at. Those #s will tell you what year your motor is . Cole
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  #38 (permalink)  
Old 05-12-2009, 12:45 AM
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Yes, I will look into the year when I get a chance, the cars not with me right now. Im wondering if it matters for the balance though. Ive read elsewhere all 351w's have the 28oz but looking to confirm. Thanks.
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  #39 (permalink)  
Old 05-12-2009, 08:34 AM
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351w

the info i dug up states all 351 ws use 28 oz so 6cyl flex is a no, go buy a new flex plat they are cheap you then have a new gear and the correct weight. cliff
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  #40 (permalink)  
Old 05-12-2009, 03:41 PM
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The 351W is 28 oz balanced..all of them. Only the 82-up 5.0s are 50 oz balanced. Earlier 302s are 28 oz balance. Someone correct me if i am wrong. And you will need a balancer to match the weight of the flywheel. Cole
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  #41 (permalink)  
Old 05-12-2009, 08:10 PM
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Appreciate the good information guys. But is there any chance on using the existing flexplate? I know the balance would be right, or will it not work with the c6 from being used with c4? Im guessing it has to be the 164t count to go with the c6? If not ill go ahead and buy a new flexplate and balancer. Thanks.
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  #42 (permalink)  
Old 05-12-2009, 08:36 PM
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351w

if engine is a 351w the front dampner will be correct, the drive plate frome the 6cyl. will be In correct, so all you need is drive plat for a351w and the c6 prev post is right re 289 302sused 28oz latter 302s 50oz all351s 28oz
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  #43 (permalink)  
Old 05-12-2009, 10:27 PM
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Thanks, dont think ill need any other questions answered really.

Im interested in knowing what some think of the setup though? 72 mustang grande, 351w, c6, 9" posi rear. I plan to stroke the 351 in the future. Is this a fair setup for the car and all? Im guessing alot would say a c4 would have been better. I heard the small block pattern c6's are rare too? Thanks.
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Old 05-19-2009, 07:32 AM
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I have another question. What gearing should I run in the posi rear end with the c6? I think 3:73 is where its at now.. Thanks in advance.
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