347 Stroker Vs. 302 Build up
 

Hey guys, I have been wanting to build myself a 347 Stroker for my mustang, which is gonna cost me around 1200 for a short block. I was thumbin through my Summit Catalog and they have a set of Roush 200 heads that outflow the TFS heads, which are suppossed to give you 78 hp and 54 ft. lbs of torque. Do u think it would be better to build a 347 or just buy heads for my 302??? I would love to build the 347 and slam the heads on there, but i dont exactly have that much dough, the build up is gonna be a long process. Also, if i upgrade to these heads is there anything else i have to do to my engine??? They have 64cc chambers what would i be looking at for compression?thanks a lot guys

$1200 for a stroker short block? does that include prepping the block. every time i priced it came out to more like $2400 if you get all the forged parts.

If you build the stroker, you still need good flowing heads.
You could always start with better heads, and then build a stroker later and re use the heads.

I noticed it's an 88. if you don't have MAF, then you'd need to burn a chip after the heads go on. I always prefered the 302. You can get more revs outta them. I guess it really comes down to TQ or HP, and which one you like more.

my recommendation, "no replacement for displacement" go with the stroker and determine what head flow requirements you are going to need based on your rpm and power wanted from your stroker motor, and the tfs heads you probably will be able to port when you get ready for your stroker motor and be able to get the maximum performance now on your 302 and later on your 347 if you do the math on your head flow requirements. Calling the manufacture is probably the smartest thing to do, but you should have a clue on what you want from your stroker motor, "i.e. camshaft, weight of the car, gears, hp, tq, intake, stall or 5-speed" start thinking now, cause if not, it will be a costly mistake

Get they heads.

You'll gain more hp from swaping heads onto your 302 than you will by stroking it with stock heads.

Not to mention a stroker is a LOT more expensive than a set of heads. I think $1200 is just the cost of the kit.

Not to mention that the 347 rod to stroke ratio is horrible. If you want the motor to last more than 50K miles, get the heads.

Trust me, my friends 347 has no problem revving right past a 302, then again the motor is forged, hogged out heads...ect...

Also a 331 would seem like a good revving setup as well.

Tireburner...how many people do you actually know that this 347 problem has happened to? I mean 1st hand information. You would have to wait 4 years just to find out, and how long have 347 kits been on the market, where people have starting using them? The 350 Chevy has the same rod ratio and how many millions of those did they build? George Klass even says its a bunch of horse &*%$. The only ratio he wants is one crank to 8 rods...

Ron

No disrespect intended, just want the real facts...

Yeah, So i have to have a chip burned for a new set of heads since i have SD?? How much does that usually run? Also, I can get a new block from Jegs for about 350, and TMD sells their stroker kit for 700 so it would be around 1200 without the machine work but i can do that. I am thinking of buying the heads and throwin em on my 302 and then building up the stroker. Do u really think that i could expect that much hp and tq from the heads? Summit says theyll give a stock motor 80hp and 60tq. Thats seems pretty damn nice to me. I would definitely have to get a good intake on top of that, then my whole engine would breath a lot better instead of just parts of it. If i had Mass Air would i not need to burn a chip for the new heads?

Where can i get a chip burned and how much does that usually cost?

The 347 puts the oil ring in the piston pin. 350 Chevy doesn't

not all of them do anymore.

Are you getting your information from super street magazine again Josh? :D

Import Racer

Like he said, not all do, but I am still curious on how many people you actually know that have had a problem. I see this on every board, but I have yet to meet one person that has had this happen. The other thing I keep thinking about is why people go to the 347. Its usually to race the car. So is the wear and tear from racing every weekend, or other reasons?

Ron

Billy Brooks, 93 GT, smoke at 65K miles

Dave Neal, 69 fastback, smoke at 70K miles

Tommy Harrison, 89 LX, 331, 65K, nothing yet

I not only know one person, I know two.

I'd go with a 331 over a 347

But back to the orginal topic, heads will add more HP than a stroker will.

well, there is no replacement for displacement. i agree with your 331 over 347 but dont agree with the head statement. add addequate heads to a stroker motor and you will have more power.

Set a goal for your car before you start your build up. The 5.0 engine can take you well into the 11's naturally aspirated with a good heads , intake and cam combo.

The only way I would build a stroker is if I was shooting for 10's all motor.

JMO,

I don't agree, but I'm not going to argue about this myth anymore. Build what you want and don't listen to the internet BS.


Wade

LOL...Could not agree more, and always remember, the advise you get here is worth exactly what you paid for it....

Ron

Yea, no duh a stroker motor with heads will make more power than a 302 with heads. THat's not my point. I said that a 303 with heads will make more hp than a 347 with stockers. Which are the option here. Stock heads and a stroker vs 302 with heads.

Making smoke at 70,000. Not bad for a motor built for thrashing on over the weekend at the track, and probably driven pretty hard on the streets. Why else do guys build these motors? To make HP and to kick some butt. I would think the average driver would have gone a 100K+. And who knows maybe it's the valve seals.

Just like mine, have to freshen it every 2 years, because its always WOT, or nothing.

Ron