331 0r 347

93 Cobra needs input · 10-16-2001, 10:50 PM

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!

WADS56 · 10-17-2001, 12:22 AM

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.

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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

Mach 1 · 10-17-2001, 02:25 AM

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

smokedchevy · 10-18-2001, 02:49 AM

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.

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

todd95GT · 10-18-2001, 10:22 AM

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

LX XLR8R · 10-18-2001, 11:17 AM

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

USMC302 · 10-18-2001, 01:39 PM

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-

Five0 · 10-18-2001, 04:24 PM

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

blue oval 50h · 10-18-2001, 08:10 PM

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

84_GT350 · 10-19-2001, 03:51 AM

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

Unit 5302 · 10-19-2001, 06:53 PM

That and the 331 can be blown and reliable.

93 Cobra needs input · 03-21-2002, 07:21 PM

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.

go4it · 03-21-2002, 09:39 PM

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.

Oldschoolpony · 03-21-2002, 11:22 PM

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.

302 LX Eric · 03-22-2002, 08:39 AM

Quote:

That and the 331 can be blown and reliable.

Exactly why it would be my choice.

E

10-16-2001, 10:50 PM	#1
93 Cobra needs input Registered Member Join Date: Oct 2001 Location: Madelia,MN USA Posts: 58	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!

03-21-2002, 07:21 PM	#12
93 Cobra needs input Registered Member Join Date: Oct 2001 Location: Madelia,MN USA Posts: 58	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. __________________ 331 stroker, JE 8.5:1 pistons, H-beam rods, steel crank, main cap, msd with 3step, BBK ceramic long tubes,TKO, 4.30's, motorsport Z303, Victor Jr aluminum heads, crane gold 1.6, southside lift bars, 90/10 front, 50/50 rear, centerforce dual friction clutch, Vortech S-trim soon.

03-21-2002, 09:39 PM	#13
go4it Registered Member Join Date: Sep 1998 Location: Wise,Va. Posts: 248	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. __________________ 93GT, B-50 Forged 327, S-trim, SFMU, TFS TW heads, TFS stage 2 cam, Ported Cobra intake, AFM powerpipe, PRO-M 75mm massair, 75mm throttle body, 42lb.inj. 1 5/8 headers, 2 1/2 h-pipe and exhaust, 2 chamber Flowmasters, 3.55 gears, Elder.timing gears, Black Magic fan, FMS aluminum radiator, MSD6al/BTM, MSD coil, MSD shift light, subframe connectors, A-pillar gauges, Hurst shifter, C4, 3500 stall, 130amp alt., 73mm calipars. 2001 Red Lightning #913 2004 F150 FX4

03-21-2002, 11:22 PM	#14
Oldschoolpony Registered Member Join Date: Mar 2001 Location: Gainsville,Fl Posts: 229	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. __________________ http://www.mustangworks.com/cgi-bin/...splay.cgi?1546

10-17-2001, 12:22 AM	#2
WADS56 gear banger Join Date: Aug 2000 Location: CHICAGO Posts: 1,144	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

10-17-2001, 02:25 AM	#3
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	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

10-18-2001, 02:49 AM	#4
smokedchevy Registered Member Join Date: Jun 2000 Location: ventura,CA Posts: 438	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

10-18-2001, 10:22 AM	#5
todd95GT Registered Member Join Date: Aug 2001 Location: Palm Beach Gardens, Florida, USA Posts: 191	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

10-18-2001, 11:17 AM	#6
LX XLR8R Dirk Diggler Join Date: Feb 1999 Location: SLOATSBURG, NY Posts: 1,931	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

10-18-2001, 01:39 PM	#7
USMC302 Registered Member Join Date: Apr 2001 Location: Gallatin, Tn Posts: 1,326	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-

10-18-2001, 04:24 PM	#8
Five0 Registered Member Join Date: Apr 2000 Location: middleburg, fl, usa Posts: 1,134	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

10-18-2001, 08:10 PM	#9
blue oval 50h Registered Member Join Date: Dec 1998 Location: NJ Posts: 219	I just purchased the coast high 347 kit and a prepped mexican block. The rod is shorter than all the other kits.

10-19-2001, 03:51 AM	#10
84_GT350 Registered Member Join Date: Apr 1999 Location: Overland Park, KS, USA Posts: 1,631	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

10-19-2001, 06:53 PM	#11
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	That and the 331 can be blown and reliable.