302 stroked to 347, Is it worth it?

[CHALKOUTLINE]

I have a 5.0 from a '90 stang, is it worth the time and effort of having it stroked to 347. I plan to use my Bronco as a daily driver with some (a little) snow/mud wheeling. If I used the kit from summit for instance what changes could I expect to see from idle to 3000rpm, torque and HP curve changes. And also fuel MPG changes. I am ultimately wanting it to be VERY reliable too, is that an issue with the 347? So is the cost to benifit ratio there? Couldn't find the answers looking at past threads. Thanks to all in advance for their input.

 

[elkhunter]

i am not sure about all the technical specs, but for what you said you are using it for I don't think it is worth it.

 

[76Broncofromhell]

Go with a stock 351 Windsor. You can get one for $200 at a wrecking yard and just rebuild it for cheap. No $1000 stroker kit necessary. Plus you can go all the way up to a 4.125" stroke on a 351 block vs the 3.48 stroke of a 302 block. Just my .02 on it.

 

[45acp]

go stroker all the way. you already have the 302.... so why not? parts costs have dropped considerably thanks to the racers, and a 331-347 can be built cheap. reliability will be fine in a truck. the powerband and everything else will depend on the heads/cam/induction used.

 

[trailpsycho]

Try contacting Jim at Indy Mustang Performance. http://indymustang.stangnet.com/index.html

He builds and sells them. I have heard that strokers can have dependability problems, so I would have it done by someone whos got experience. Jim can give you some ideas on the stats you asked about. Good luck and let us know how it turns out.

 

[wildbill]

;D ;D ;D Why not just find a 351W and go from there more HP and more torque and less money and a kick $$$ motor with a good RV typ cam 4V and headers have fun.%) %) %) Bill %)

 

[Mr Joe]

I'd heard that the 331 would be more durable than the 347 because the wrist pin on the 347 piston is right at the oil ring. The 331 piston would be stronger.... just what I've reasearched.

 

[45acp]

the only longevity issues are on a high rpm race motor. in a low-midrange truck use, you should be able to get well over 100k miles out of a 347 and even more out of a 331. why go buy a 351 when you already have a 302?

 

[eBronc]

Wish I'd have seen this before I built my 357...

why go buy a 351 when you already have a 302?

Hell, if you're going to go stroker, go BIG - Speedway Motors has a kit that'll take a 351W up to 396(!) with a Scat crank and Keith Black pistons for less than $800.

http://www.speedwaymotors.com/xq/as...q./cont.1/intPgNo.1/redirect./qx/product.htm0

 

[Synds9]

i run a 347, the engine it's self runs smooth and reliably. it's worth it if you already have the majority of 302 parts. and to go to a 408 stroker and do it right it would cost significantly more oh and im running eagle rods, scat crank, and je forged pistons. if you're gonna do it, don't skimp ;D

 

[76Broncofromhell]

It's about the same price to stroke a 351 to 408 as it is to stroke a 302 to 347. The weight difference is within 50 lbs and the price difference of the kits are within $200, so why not use a bigger block? More stroke = more torque, but it's still up to you. My stroker is wild, I can't imagine the reasoning for building one to be tame, but I guess that's just me.

 

[Skuzzlebutt]

I would go with the W over the stroker. Cost, simplicity, reliability are the big +++ in my book. The stroker has a WOW factor to it but that's about all. Now if you were talking about a newer car that had to pass inspections I would go stroker.

 

[CHALKOUTLINE]

WOW, I just put this up last night and look at all the input. THANKS A TON!!!! I will admit though that I am suprized that one of you didn't have stock HP and Troque vs. stroked #'s. I understand theat there is too many choices of parts to get specific #'s for a stroked motor which is why I chose the Summit basic kit as an example. But I do really appreciate the replys. You guys rock! Keep 'em coming!;D

 

[rjlougee]

NO, it isn't. Especially when compared to the cost of the 351W instead. And if you add the longevity and extra MPG you should get from a stock 351W, then it really doesn't add up.
Joe

 

[yellowbilly]

Ya, but I live for the WOW factor!!!!!! ;D I have a nasty little 408W, so obviously I like strokers. It all depends what you have, what you want and what you want to do. If you have a good 302 that needs no machince work, and already have a good manifold and distributor, go for the stroker and run circles around the stock 351's. The those little strokers run great. But, if you have a junk 302 go for the 351W, then stroke that too!!!! Machine work is a spendy part of a rebuild that people often forget about. Don't worry about reliability, if you are keeping any of the motors under 3000 you should have no worries on a well built motor.

Just another jokers .02 :-X

 

[45acp]

I will admit though that I am suprized that one of you didn't have stock HP and Troque vs. stroked #'s. I understand theat there is too many choices of parts to get specific #'s for a stroked motor which is why I chose the Summit basic kit as an example. But I do really appreciate the replys. You guys rock! Keep 'em coming!;D

way too many different variables to even guess. even considering things like stock cam and heads there are just too many differences. expect about 20-30hp gain with stroking and keeping everything else stock. bear in mind you will want a little bigger cam in the stroker than you would use in a stock 302 rebuild.

 

[PS]

Something else to think about is how you want your Bronco to look. A 351 requires either a hood scoop or body lift (maybe both). If everything is planned carefully, a 302/347 can be made to fit under the stock hood . For a similar use (mainly a driver) I've got a really nice running 302, .060 over, World Heads (Rousch), cam, roller rockers, headers, Holly 4bbl, Edelbrock Performer intake, and full MSD ignition. At the rear wheels my truck puts out 245 hp and 300 ft-lbs of torque. Pretty adequate power for a driver. I still use my stock hood, which I personally prefer the look of. Just my opinion, but decent mileage and the reliability of an anvil are an extremely hard combo to pass up.

 

[Broncobowsher]

I have seen 351's fit under a stock hood without a body lift. I almost could do it on mine. I have seen it done with both the stock air filter and small aftermarket air filters.

 

[ABurns]

The 351w will fit under stock hood if you cut the hood brace out. I ran that way for a couple years that's with a regular Performer manifold. When I went to an RPM air gap, it had to put a hole in the hood.