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Old 02-15-2008, 09:06 PM
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Why stroke a 302?

I was wondering what the advantage (if any) is to stroking an engine. Why stroke a 302 to a 347 if you can just put in a 351?

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Old 02-15-2008, 09:40 PM
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Well, I suppose one reason would be if you already have a 302 and don't have a 351. The 351 would be a little heavier and would have a taller block, so it may not fit as well as the 302. And I suppose if you have a dedicated intake manifold and heads (matched up), you may not want to have to match up the new 351 manifold with your existing high-buck heads.

These are a couple of reasons that come to mind. I'm sure others on the board can add to them.
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Old 02-15-2008, 11:41 PM
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I think if I were working with a full size pickup or large car a 351 would be the cheaper route but I've been told 351s can be a bit of a tight fit in the Mustangs. I don't know that for sure but its what I've been told.
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Old 02-16-2008, 12:07 AM
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Couple of reasons come to my mind..Lets say one has a Mustang with a 302..by stroking it you get a good displacement increase and no one needs to be wiser and all the parts one has fits it..saving a good bunch of bucks..

Another time is if one is racing in a displacement limited class such as limited sprint or something of that nature..one can build a 347 and save a few lbs in the front of the car which allows for a bit better weight distribution and since most of those classes allow up to 358 one can bore and freshen a 347 several times before it gets too big to run in that class..

So there are a couple of reasons..one is save some bucks by using ones existing parts..the other is to fit into a race class in a way that gives one a bit of an edge...

As far as bucks are concerned..around here a fellow can get lots of 302 blocks heads and manifolds for very reasonable..the 351 being a bit more popular is sometimes quite a bit more when they can be found..


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Old 02-16-2008, 07:25 AM
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Here is something else to consider, example I have a all original 73 Fastback Mustang but it only has a 302. The motor needs rebuilt but I would like to have more cubic inches and don't want to change the originality. So I do a stroker kit for my number matching 302. I get more cubic inches and still retain the original engine.
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Old 02-16-2008, 08:04 AM
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All of the above mentioned reasons are good. Fitment and looking original would be my two top answers. 351s are a tight fit in early Mustangs but will work without too much hassle. I'm guessing that you have a 69 so fitment would be no problem. A 351W with aluminum heads and intake will weigh less than a stock 302(so I've read). The beauty of a 351W is that you can stroke it to big block cubes. I've got one in the works for a 408 and you can go larger than that.

Danny
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Old 02-16-2008, 08:34 AM
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Thats what I was wondering,The difference between a 351W and a 351C and also or the 302 and 351W basically the same engine or no interchangeability?I know how the C has much bigger heads but always thought the W and 302 were very similar.
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Old 02-16-2008, 02:50 PM
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The 351W is similar to the 302, but all the parts wont interchange. I used 351W heads on a 302 back in '82.
351 heads will work on a 302, but 302 heads don't have big enough head bolt holes for the 351 head bolts.
The deck height is taller on the 351, so the intakes wont interchange.
JA
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Old 02-16-2008, 02:59 PM
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Thanks guys!
Does anyone know what (if any) HP gain/loss would be between a 351 and a 347 (with the same equiptment). Is it comparable? A 347 would have higher compression correct?
The car is a 69 Mustang by the way.
Thanks for the help/advise!!!
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Old 02-16-2008, 05:03 PM
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Quote:
Originally Posted by CandyRed69
Thanks guys!
Does anyone know what (if any) HP gain/loss would be between a 351 and a 347 (with the same equiptment). Is it comparable? A 347 would have higher compression correct?
The car is a 69 Mustang by the way.
Thanks for the help/advise!!!
If everything else is equal (heads and pistons) then your compression would be really close to the same with the 351W actually being a little higher. If you stroke your 302 (especially if it's a J code engine) to a 347 and use stock pistons and stock heads then the compression would probably go through the roof. When you stroke you usually need to compensate with the heads, pistons or both to get your desired compression.

If I were in your shoes and didn't care if it looked 100% original I'd go with a 351W. They look a lot alike anyway. The 351W is just a little wider and a little taller. The 351C is a good engine but parts for them are going to cost more.

Danny
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Old 02-16-2008, 07:20 PM
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There were a lot more 302s built than 351Ws, and way more of both of those than 351Ms, and more of those than 351Cs. So one reason for selecting one over another is availability.

And the 302 is the lightest of the four. (lowest deck height and narrowest too)

But you can take the 351W up to 392 or 408 easily, 347 is as far as you can go with the 302.

Lots of good reasons to use any of the above depending on what you are trying to do.
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