331 0r 347
 

Anybody had real good luck with a stroker kit from a reputable place I want to purchase a kit but I've heard the 347 wrist pin goes through the oil ring were the 331 doesn't just looking for a quality kit!

I have a 347 and love it. The pin is in the ring land area with no oil control problems. With good machine work, and assembally you would be fine. The rod to stroke ratio seems to be a big debate between the 331 and the 347 and wich one will last longer. I chose the 347 because of the extra cubes and it is a proven performer.

------------------
79 hatch w/ NA 347,stage 2 Canfield heads, out of the box Victor 5.0 intake, solid roller cam, Aeromotive fuel system, proshifted TKO II.MY CAR http://www.mustangworks.com/cgi-bin/...splay.cgi?1288
93lx all stock + tremec

what is more important to you - extra cubes and power, or longiveity?

every engine is a compromise, as is this choice.

------------------
1993 GT/AOD
'93 Mustang GT

I remember reading somewhere that the 331 doesn't need the block notched and that it's the same as assembling a regular 302 engine. That's a big bonus in my book.

------------------
92 GT, 4:10 gears, centerforce clutch, 6# powerdyne blower, bbk h-pipe, flowmasters

Correct, the 331 assembles like a standard stroke 302. However, if you're rebuilding the motor and machining the block, it's not too expensive to notch it for stroker clearances. My plans call for a 331. Don't ask why, I just like the sound of it. You're still talking about 30 extra cubes though. On a 300 horse 5.0, that's an extra 30 ponies right there. And that's just equating a modest one horse per cubic inch. I have read about longevity issues with 347's due to the piston design as previously stated in another response, but I don't know if you should be concerned about that in a street application. The current 5.0 and Super Fords issue has a 331 build up with AFR 185's and a Probe stroker kit. Next month is the dyno test and results.

------------------
Todd
1995 GT/T-5
Pulleys; 65 mm TB; Flowmaster cat-back; Mac off road H-pipe; FMS aluminum driveshaft; short-throw shifter; HD clutch; Cobra R's; Cobra front and wing

your right you do not need to notch the block for a 331..just a 347..the reason why the 331 lives longer is the rod ratio..it is actally better than stock...better rod ratio means higher revving and longer life...rod ratio in 347 keeps the lifespan lower than other stroker kits..if you want a really hgih reving and want to swap to a solid cam then go with somehting like a 317 stroker and rev it to 8k!!!
BTW the coast high 347 stroker kit does not have the wrist pin intersecting the oil conrtol ring..if you do get a kit get a coast high

------------------
1987 black notch(ex 4 banger)
DSS 306 w/ main support...Elderbrock 6028 heads..gt-40 intake..24# injectors...70 mm tb..77 pro-m...accel 300+..mac full legnth..tremec w/ pro5oh...full MAC exhaust,off road h-pipe,long tubes, catback...ron davis radiator..subframes, control arms...CFDF II..o yea holley FPR sucks..dont buy one..
AIM=onesillynotch
http://cwm.ragesofsanity.com/contrib/owen/scatter.gif

331, not as common either!

------------------
88LX NOTCH 5.0, TFS Twisted Wedge Aluminum heads, 2.02 1.60 valves, BBK shorties unequal 1 5/8, off road H-pipe, Flowmasters, Drag lites, custom grind cam, solid motormounts, Aluminum Driveshaft, BBK springs, lakewood 90/10 50/50 shocks, BBK upper and lower control arms, 4.10 gears, centerforce DF clutch, adjustable BBK clutch cable with aluminum quadrant, Billet Steel flywheel, 70mm Acufab Throttle Body,MAC cold fender mount induction, K&N, 3 core radiator, flex-lite-fan, custom hardened push-

I have the 347 kit from coast high performance and love it. I was not too happy with some things that happened but I love the kit.

Getting the block notched for the extra clearance needed only set me back an extra $60.

Also the probe kit is supposed to be good for 100,000+ miles according to coast high; they say because of the off set wrist pin the pistons don't rock in the cylinders.

I don't know how much of that is true but they do have one of the best kits out there.


------------------
James Cox
nochevy@hotmail.com
1991 Mustang LX

I just purchased the coast high 347 kit and a prepped mexican block. The rod is shorter than all the other kits.

They both make good arguements. A 347 will make a tad more torque and HP, but theoretically a 331 will live longer if designed and built right thanks to the preferable rod/stroke ratio. For my money it's the 331. Better rod/stroke ratio, no notching the block (not a big deal...but more money nonetheless), and (again, theoretically) better oil control. Plus it just sounds more unique than a 347.

------------------
1984 1/2 GT350 (#842 Hatchback w/ T-tops), 302HO, Comp cams Xtreme Energy cam, Carter 625cfm carb, Weiand Stealth intake, MSD distributor, MSD coil, FMS 9mm wires, 1 5/8" MAC unequal shorties, 2 1/2" MAC Prochamber H-pipe, Flowmaster 2 chambers, KYBs, 16"x8" 4 lug Cobra Rs, Falken 245/45ZR16s

So I pushed it up to 110,
That flathead motor was about to give in,
I crossed my fingers and prayed to the lord,
Don't let me down you fuct up ford!"

"5-Oh Ford" by The Reverend Horton Heat

That and the 331 can be blown and reliable.

Just trying to clear up a little confusion that may have been spread on my post. I have purchased a new 331 kit from Keith Craft racing and the piston pin goes right through the lower oil ring on the JE dished pistons and the block needs to be clearanced for the larger rod size. It sounds normal to have these issues even with the 331. The rod ratio is a lot better than the 347 and there are no oil control problems. Just thought I would pass along the info.

If you use h-beam rods you have to clearance the block, with I-beam rods you don't. Once the block was marked it only took about 30 minutes to grind the little notch at the bottom of the cylinder walls. I got CHP street fighter dished pistons (standard bore) and the pin is not in the oil ring. Building a 327 by the way.

347
 

Coast High Performance has designed a 347 that they say can go 100,000 miles with no problems. Different rod lenght and piston design.

Remember, there's no replacement for displacement.

Exactly why it would be my choice.

E