I've been seeing stuff on here about making the 302 into a 347 stroker, so I have been checking it out a little bit, and am very interested in doing so. But I really don't know what all is involved in the conversion. So I guess I am looking for some help to see what it takes to do this, before I make my final decision on if I am going to go through with it or not.


1995 F-150 XLT 2wd reg. cab short bed.

 

>I've been seeing stuff on here about making the 302 into a
>347 stroker, so I have been checking it out a little bit,
>and am very interested in doing so. But I really don't know
>what all is involved in the conversion. So I guess I am
>looking for some help to see what it takes to do this,
>before I make my final decision on if I am going to go
>through with it or not.
>
>
>1995 F-150 XLT 2wd reg. cab short bed.

i have been looking in to a 393 stroker for my 351w in my 1988 f250 so i can tell you a little. for the most part you get the extra cubes from a new stroker crankshaft that has a longer stroke. that, combined with boring out your cylinders a little larger gives you the cubes of the 347. The "problem" for me is that i have a speed density system not a mass-air system which means my computer may not be "smart" enough to be able to handle the modifications. you may have a mass-air system and if so you are way ahead of the game (and me) cause you do not have the expense/hassle of converting over your electronics etc. As well, if doing this project, you get into what i like to call "while-you-are-at-it-itis" which means that while you are at it, you may as well give that strkoer some nice heads, headers, new intake, throttle body, roller cam, etc etc. till you are at $10,000 for the motor alone! do a search on stokers on this site or on the net and you will find many articles on the 347 stroker. i think the 347 requires some "clearancing" of the block for the new crank and caps. there is a slightly smaller stroker i think that people say is a more reliable, longer living mototr.

happy wrenching!

 

hey man,
after recently reading an article in muscle mustangs and fast fords, i would recommend that you go with the 331 stroker kit rather than the 347. the article basically said if you're not gonna race it, dont build a 347. they dont have the longevity that the 331's do, and a 331 can make similar power. check out probe industries
www.probeindustries.com/ they have a bunch of cool stuff. havent looked at their site much but they have great stuff in their ads in magazines. anyway, good luck


mike

 

I would also not recomend going with the 347 stroker.The 347 due to it's longer stroke can lead to scuffing or piston wear in some kits.Also alot of the early kits have the oil ring in the piston pin which leads to excessive oil consumption.I would recomend the 331 also.I would not deal with probe,they make a good kit but their customer service sucks.Kieth craft(www.keithcraft.com) is a well respected engine builder.He sells a 331 kit for $1300 with eagle rods and crank.You'll just need to assemble the motor yourself or have a local machine shop do it.He can build you a stroker longblock also.

Billy

 

[updated:LAST EDITED ON 02-Apr-02 AT 04:50 PM (EST)]Hey everyone, thanx for the advice. I have been researching the 331, and it does sound like a better idea. I was also wondering if it is possible for "home" mechanics to do this kind of thing(my dad and I). If so, how long would it take??? If not, whats a good price to get someone else to do it? Any additional comments or information is greatly appreciated.

RedDeViL

 

I would rather go with a 351, which I believe already is a sort-of-stroked 302, but has beefier main and rod journals. I am not sure the 302's journals would hold up as well under the stroker application.

Just my thoughts. BTW I have no experience at building engines.

 

Building a stroker motor is pretty much the same as building a stock motor.You've got crank with increased stroke on it and longer connecting rods.It's important to check bearing clearances and also rod side clearance,but these are things a good engine builder checks anyway.I'd say if you've built an engine before it should'nt be a problem.I would recomend ordering a balanced kit.However, if you've never built an engine or feel you'd be over your head,you can get a machine shop to assemble the short block.A buddy just built a 427 stroker from a 351 block.I think he paid about $750 for the machine work,cleaning, boring block and assembly of long block.This was labor only.


Billy

 

The only real problem with the 347 stroker is the short rod length compared to the windsor. The 347 or the 331 will have the additional weight savings of about 150# over the 351. you might be able to get away with a computer out of a 351 truck with the 347 if your cam stays the same as factory 351. the journal sizes of the 347 vs. the 351 shouldn,t be a problem unless you're really pushing the limit. I agree the pistons don't live as long because of the short wrist pin height. you will notice that the 347 will have a lot more throttle response because of the lighter crank rods etc.