I am plannin on ordering a stroker kit for my 95 mustang cobra. I have heard that a 331 is better than the 347 kit. I'm not sure why. Can someone please explain and clear some things up? Also what do you guys think about doing a port and polish to the heads/intake? Should I just buy new ones or would a port and polish do alright? Any opinions on a good H/C/I I could go with? My goal is to get to 450 rwhp. Is this a solid plan to get there?
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95 Mustang Cobra
347 Stroker, Cobra Heads/Intake, Comp Cams Magnum 270 cam, Upper/Lower Control Arms, Subframe Connectors, Strange 10 Way Adjustable Struts/Shocks, Eibach Drag Launch Springs, MGW short throw shifter, O/R h pipe, SLP lm1 Catback, K&N big cone filter. Still running on the stock tune
The differance between the 331 and the 347 is the stroke. That longer stroke increases the rod angle. If you're going to race the car and get the rpm's over 6,500 on a regular basis, stick with the 331. Otherwise, there's nothing wrong with the 347.
The stock heads are mediocre at best. They barely feed a 302 adequatly. I wouldn't waste my time working them over. You should upgrade the heads to match the increased displacement. You'll do it eventually anyway, might as well do it now and be done with it. I use Dart Pro-1 heads with excellent results; and they're cheaper than most other aftermarket alum heads.
I use strictly Comp Cams parts. Look at the descriptions in the catalog for something that fits your needs. Then go 1-2 steps up from that. Increased displacement will "soften" the cam.
The 331 can make as much power as the 347, don't let those 16 cubes be the deciding factor on which one you go with.
The heads, cam, intake choices all depend on what you want out of the car. Most want a daily driver so I'll go with that.
HEADS:
AFR 185
TFS Twisted Wedge CNC 185
Dart Pro 1
Edelbrock Performer RPM
World Products Windsor
INTAKES:
Holley Systemax II
TFS Track Heat
Edelbrock RPM II
Weiand EFI
CAM:
For a street engine, I'd suggest Comp Cams Xtreme Energy cam, part number 35-518-8, grind number XE274HR. It has .555/.565 lift, 274/282 duration, 224/232 duration at .050 lift, a 112 degree LCA and a powerband of 2200-6200. It'll require at least 3:73 gears, and if paired with an automatic tranny you'll need at least a 2500 stall speed converter.
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So what are the differences between the 331 and 347? I've never heard of the dart pro heads but I like that they are cheap. Are they as good as the other brands listed? Also what intake would work best with the dart pro?
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95 Mustang Cobra
347 Stroker, Cobra Heads/Intake, Comp Cams Magnum 270 cam, Upper/Lower Control Arms, Subframe Connectors, Strange 10 Way Adjustable Struts/Shocks, Eibach Drag Launch Springs, MGW short throw shifter, O/R h pipe, SLP lm1 Catback, K&N big cone filter. Still running on the stock tune
The only differance is the stroke. Other than that, they are exactly the same.
Dart heads are made by the same people who make the famous Dart block. www. dartheads.com I have their heads and block on my Cobra - the dyno sheet is in my profile.
I can't give you a specific intake suggestion, since I don't use that kind of EFI. But any high flowing intake should work just fine.
As stated above its the stroke, but is it the crank or rod length? I'm assuming its the crank is built for the 347. I would do the 331, because most of the power is really coming from your heads, intake and cam anyways.
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DHG #01434 Bullitt - full JLT intake, MGW shifter, Accel coils (I wish I had 4.10s, o/r H, tune)
Black 89 LX(the drag car) best 8.75 at 80 mph in the 1/8
97 Mountaineer V8 AWD
95 Mustang Cobra
347 Stroker, Cobra Heads/Intake, Comp Cams Magnum 270 cam, Upper/Lower Control Arms, Subframe Connectors, Strange 10 Way Adjustable Struts/Shocks, Eibach Drag Launch Springs, MGW short throw shifter, O/R h pipe, SLP lm1 Catback, K&N big cone filter. Still running on the stock tune
What do you guys think of this setup.
Pro dart 1 heads
Edelbrock RPM II intake
XE274HR compcam
Will this be a good setup and how much horsepower will I end up with.
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95 Mustang Cobra
347 Stroker, Cobra Heads/Intake, Comp Cams Magnum 270 cam, Upper/Lower Control Arms, Subframe Connectors, Strange 10 Way Adjustable Struts/Shocks, Eibach Drag Launch Springs, MGW short throw shifter, O/R h pipe, SLP lm1 Catback, K&N big cone filter. Still running on the stock tune
A 331 is a better street and high RPM set up. With a 331 you will get almost the same engine life as a 302/306. The 347 you will have to rebuild after 70-90k miles. Not only does the 347 have poor piston to rod ratios, but it also has problems with ring placement, this has been corrected over the last few years, but it is still not right. My opinion is the 331 is a LOT better all around engine.
As far as heads, I have heard nothing but great things about AFR over the years. you could use the 185s with a 331/347, but you will lose some low end. You could actually get away with 165s if you dont plan on a power adder in the future. Intakes I would ask someone like TMOSS on here. He might suggest something like the Cobra intake, but ported. Cam, hmmm, go with a custom grind. Call a cam company and ask them for advice. You can also call someone like Steeda, Anderson Motor sports, Comp cams, etc and get advice for one of their off the shelf cams. I had an Anderson B31 cam on a 302, and I loved it. Great power on a N/A car, and the cam was designed for a blower. That cam pulled harder then the E cam it replaced.
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Get the aluminum 170 heads. Dart heads flow more per intake cc than other heads. Not sure why, they claim it has something to do with the wet flow bench they use for development. I'm using the 195 heads on a 427 cube engine.
The combo you mention should work well together. I can't really say exactly how much hp, but I would guess 400'ish at the crank.
Ok thanks for all of the help guys. One last question, with this setup could I add a supercharger in the future? Or would a different setup be better for that?
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95 Mustang Cobra
347 Stroker, Cobra Heads/Intake, Comp Cams Magnum 270 cam, Upper/Lower Control Arms, Subframe Connectors, Strange 10 Way Adjustable Struts/Shocks, Eibach Drag Launch Springs, MGW short throw shifter, O/R h pipe, SLP lm1 Catback, K&N big cone filter. Still running on the stock tune
jumping in a little late but here is something else you might have been thinking about. The 347 kits had a bad rep for being an oil burner because the connecting rods interfered with the piston rings and let oil seep through. In the past this led many people to go with 331 for "reliability" issues. Most manufactures have addressed this problem and altered the designs slightly. It was/is a minor thing but some got very worried about it.
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Ok thanks for all of the help guys. One last question, with this setup could I add a supercharger in the future? Or would a different setup be better for that?
Depends on the compression ratio you choose. Ideal for a supercharger is abour 8-8.5. Ideal for street performance is about 10.5.
95 Mustang Cobra
347 Stroker, Cobra Heads/Intake, Comp Cams Magnum 270 cam, Upper/Lower Control Arms, Subframe Connectors, Strange 10 Way Adjustable Struts/Shocks, Eibach Drag Launch Springs, MGW short throw shifter, O/R h pipe, SLP lm1 Catback, K&N big cone filter. Still running on the stock tune
Stroker kit questions for my 1995 mustang cobra 
