351w or 347 stroker? which is better?

BLACK85GT · 12-11-2002, 08:41 PM

Given the choice, which combo would be better for street,strip use, a stock 351w or a 347 stroker? I have both a 351w complete motor and a 302 complete motor that would need a stroker kit. They are both non-roller blocks. Would there be any benefit to doing a stroker 302 when i have a 351w. (I would need all the conversion items for the 351 to fox body). What do you all think? Decisions, decisions...

Eric4Nitrous · 12-11-2002, 08:47 PM

no substitute for cubic inches..

restridge · 12-11-2002, 09:34 PM

351w would be much cheaper.

82 GT · 12-12-2002, 03:23 PM

Why not just stroke the 351w to a 408? The money you would spend stroking the 302 could be used to stroke the 351.
It all comes back to how much $$$ you have to spend.

greydan · 12-15-2002, 12:34 AM

I've thrown that one around myself. If You stroke the 302, you loose engine life. If you don't stroke the 351w, it lasts longer.
For me the 351W for street use is my choice. For the strip, a stroked 351w would be turning faster ET's for a few bucks more...concidering it all costs alot $$$$ in any case.

tireburner163 · 12-15-2002, 01:23 AM

If you want the motor to last more than 50K miles use the 351W

flyin 5.8 · 12-15-2002, 07:11 PM

Dollar wise I'd go with a 392ci stroker. If I remember right a 392 is a 3.85" storke crank, 351w rods and 302 pistons. FRPP sells the crank (I think it's like $500?) and if you can't or don't want to use the 302 pistons you have, stock type pistons should be cheaper than the stroker ones.

IMHO
Brian

Where is Clawson,MI

sn95gt19 · 12-16-2002, 10:14 AM

i have a 347, and to tell you the truth i could have built a 351 for the same exact price. (a stroker) check out ebay, there are companys on there with ebay "stores" and they have everything for a stroker, (i would piece one together) forged 347-408 cranks for 300.00 brand new. you will save probably 200.00 on each thing you buy if you go through ebay. i would only buy from the stores though and from people.

WADS56 · 12-16-2002, 10:52 AM

A 347 will make more power then a 351 in the SAME conditions.

Agent_4573 · 12-16-2002, 11:14 AM

I would go with the 351 just for longevity. I'm sure the horsepower numbers are close to being the same and the 351 is almost garenteed to last longer.

Agent_4573 · 12-16-2002, 11:25 AM

I would go with the 351 just for longevity. I'm sure the horsepower numbers are close to being the same and the 351 is almost garenteed to last longer.

7000rpmisheaven · 12-16-2002, 02:06 PM

Quote:

Originally posted by WADS56
A 347 will make more power then a 351 in the SAME conditions.

You should probably explain that.

82 GT · 12-16-2002, 04:13 PM

I think what WADS56 was trying to say is that if both engines had same compression,heads,intake,cam,induction and exhaust etc. that the 347 would still make more power than the 351.
Actually, a 347 really has 350 cubic inches of displacement but they didn't want to advertise it as a "350"

7000rpmisheaven · 12-17-2002, 08:55 AM

I am not trying to argue at all. I'm just curious cause I don't understand why one would make more power than the there. Even being a 350 as you say I still don't understand. If every part of the setup thats affects flow or power production on both motors (compression, heads, cam, ...etc), why will one make more power than the other.

WADS56 · 12-17-2002, 09:26 AM

Quote:

Originally posted by 7000rpmisheaven
You should probably explain that.

I was waiting for someone to call me out on that

A 347 which uses a smaller crank journal than a 351 will free up a few ponies right there. Also, the .030 over bore on the 347 will hep the intake flow beter then the 351 with the standerd bore. This will not make huge power gains over the 351, but it will make more

And as far as the 351 lasting longer....? I don't agree with that either. If it was a 600hp motor then yes, a 351 is a much stronger block. But if this was a 350-400hp motor, they will last the same.

Wade

7000rpmisheaven · 12-17-2002, 09:28 AM

Thanks. I had a feeling it was something like that. Can someone tell me which is better for longevity smaller or larger crank journals. I would guess smaller.

82 GT · 12-17-2002, 04:20 PM

Quote:

Originally posted by WADS56
I was waiting for someone to call me out on that A 347 which uses a smaller crank journal than a 351 will free up a few ponies right there. Also, the .030 over bore on the 347 will hep the intake flow beter then the 351 with the standerd bore. This will not make huge power gains over the 351, but it will make more power

It might make a little more HP but will it make more torque?
Torque is what give you the low E.T and HP give you the MPH at the traps.
Does the 347 have a longer stroke than the 351w?
With all things being equal, then I would say the engine with the longer stroke would give you a slightly better E.T.

WADS56 · 12-17-2002, 08:35 PM

Quote:

Originally posted by 82 GT
It might make a little more HP but will it make more torque?
Torque is what give you the low E.T and HP give you the MPH at the traps.
Does the 347 have a longer stroke than the 351w?
With all things being equal, then I would say the engine with the longer stroke would give you a slightly better E.T.

A 347's stroke is 3.400 and a 351 is 3.500. That is very little and I'm not sure if that will even make a difference. Were talking about 4 little cubes here which is nothing. Look at it this way the .030 overbore makes up for the 4 cubes, and the smaller journals the 347 has put it over the top. Now if you stroke the 351 that would change it all

tireburner163 · 12-17-2002, 11:55 PM

Quote:

Originally posted by WADS56
And as far as the 351 lasting longer....? I don't agree with that either. If it was a 600hp motor then yes, a 351 is a much stronger block. But if this was a 350-400hp motor, they will last the same.

I dissagree. The rod/stroke ratio on a 347 far worse than the 351W. The 347 will be using oil WAY before the 351W. Which is why I say.....If you want the motor you last more that 50K miles, go with the 351W.

Mustang_289 · 12-18-2002, 07:52 AM

I'm not an expert by any means - but I've heard a punched out 302 to 347 is a good powerplant but it's not reliable over the long-term.

my 2cents - all these posts pretty much say the 347 and 351 are pretty close. if you've got both blocks I would suggest going with the 351 as it can always be stroked to 392 or 408 I believe.

12-11-2002, 08:41 PM	#1
BLACK85GT Registered Member Join Date: May 2002 Location: Tampa,FLORIDA Posts: 340	351w or 347 stroker? which is better? Given the choice, which combo would be better for street,strip use, a stock 351w or a 347 stroker? I have both a 351w complete motor and a 302 complete motor that would need a stroker kit. They are both non-roller blocks. Would there be any benefit to doing a stroker 302 when i have a 351w. (I would need all the conversion items for the 351 to fox body). What do you all think? Decisions, decisions... __________________ 5.0, Holley heads, 1.7 Scorp Rockers, Stealth intake, Holley 600 carb, Holley Mech. Fuel pump, MSD 6Digital, MSD distributor, Hotchkis upper/lower rear control arms, FMS B Springs, 3:73 (8.8) rear. Production # 9,377

12-11-2002, 08:47 PM	#2
Eric4Nitrous Registered Member Join Date: Jan 2002 Location: Va Posts: 1,122	no substitute for cubic inches.. __________________ 68 Camaro Gene Fulton 632ci Two stages of Jug 8.41 164mph Rockingham 1-26-03

12-12-2002, 03:23 PM	#4
82 GT Import Slayer Join Date: May 1999 Posts: 2,241	Why not just stroke the 351w to a 408? The money you would spend stroking the 302 could be used to stroke the 351. It all comes back to how much $$$ you have to spend. __________________ '82 GT 351W (.060)Comp Cams 274* Extreme Energy cam, ported & polished heads w/ 1.94/1.60 valves 10.3:1 flat top pistons,stealth intake, Mallory dizzy,Holley 750dp carb, BBK shorties,Flowmaster exhaust,C-4 with 3700 stall converter, B&M pro shifter,8.8 rear, 4:10's, subframes, electric fan, powermaster alternator, 4 core radiator.

12-15-2002, 12:34 AM	#5
greydan Registered Member Join Date: Jan 2001 Location: clawson, mi. Posts: 32	302-351w I've thrown that one around myself. If You stroke the 302, you loose engine life. If you don't stroke the 351w, it lasts longer. For me the 351W for street use is my choice. For the strip, a stroked 351w would be turning faster ET's for a few bucks more...concidering it all costs alot $$$$ in any case.

12-15-2002, 01:23 AM	#6
tireburner163 It's a lot like a race car Join Date: Aug 2000 Location: Meridian, MS Posts: 4,130	If you want the motor to last more than 50K miles use the 351W __________________ 1987 Buick T-type 1998 HD Electra Elide

12-11-2002, 09:34 PM	#3
restridge Registered Member Join Date: Dec 2001 Location: South Carolina Posts: 14	351w would be much cheaper.

12-15-2002, 07:11 PM	#7
flyin 5.8 Registered Member Join Date: Apr 2002 Location: Holland, Michigan Posts: 73	Dollar wise I'd go with a 392ci stroker. If I remember right a 392 is a 3.85" storke crank, 351w rods and 302 pistons. FRPP sells the crank (I think it's like $500?) and if you can't or don't want to use the 302 pistons you have, stock type pistons should be cheaper than the stroker ones. IMHO Brian Where is Clawson,MI __________________ If girls are made of sugar and spice, how come they taste like tuna? "Nitrous is like a hot chick with an STD . . . you want to hit it, but your afraid of the consequences."

12-16-2002, 10:14 AM	#8
sn95gt19 motors done......woohooo Join Date: Mar 2002 Posts: 799	i have a 347, and to tell you the truth i could have built a 351 for the same exact price. (a stroker) check out ebay, there are companys on there with ebay "stores" and they have everything for a stroker, (i would piece one together) forged 347-408 cranks for 300.00 brand new. you will save probably 200.00 on each thing you buy if you go through ebay. i would only buy from the stores though and from people. __________________ 95gt lazer red (98 cobra clone) Rice Haters Club Member #116

12-16-2002, 10:52 AM	#9
WADS56 gear banger Join Date: Aug 2000 Location: CHICAGO Posts: 1,144	A 347 will make more power then a 351 in the SAME conditions. __________________ 79 Hatch: NA 347, Stage 2 Canfield Heads, Victor JR. Intake, Blueprinted Holley 750 HP, Solid Roller Cam, Shooting for 10's on motor 93 LX: Tremec, dual friction clutch, fms flywheel, Hedman shorties, O/R H-pipe Ricer hater's club member #49

12-16-2002, 11:14 AM	#10
Agent_4573 Registered Member Join Date: May 2002 Location: New Jersey Posts: 375	I would go with the 351 just for longevity. I'm sure the horsepower numbers are close to being the same and the 351 is almost garenteed to last longer. __________________ '89 LX 5.0, off-road h pipe, flowmaster muffs, underdrive pulleys, rebuilt WC T-5, King Cobra Clutch, 65mm throttle body, Explorer Upper/GT40 lower, Lakewood Rear Lift Bars. 76mm C&L Mass air w/ inlet pipe, Twisted wedge heads w/ stage 2 port,polish, MAC equal length shorties, Billet AFPR, 255LPH fuel pump, fresh low end w/ 10.5:1 compression. If anyone ever wants to go to Raceway Park in Englishtown New Jersey, give me a shout. RICER HATERS CLUB MEMBER 87! www.ricehatersclub.com

12-16-2002, 11:25 AM	#11
Agent_4573 Registered Member Join Date: May 2002 Location: New Jersey Posts: 375	I would go with the 351 just for longevity. I'm sure the horsepower numbers are close to being the same and the 351 is almost garenteed to last longer. __________________ '89 LX 5.0, off-road h pipe, flowmaster muffs, underdrive pulleys, rebuilt WC T-5, King Cobra Clutch, 65mm throttle body, Explorer Upper/GT40 lower, Lakewood Rear Lift Bars. 76mm C&L Mass air w/ inlet pipe, Twisted wedge heads w/ stage 2 port,polish, MAC equal length shorties, Billet AFPR, 255LPH fuel pump, fresh low end w/ 10.5:1 compression. If anyone ever wants to go to Raceway Park in Englishtown New Jersey, give me a shout. RICER HATERS CLUB MEMBER 87! www.ricehatersclub.com

12-16-2002, 04:13 PM	#13
82 GT Import Slayer Join Date: May 1999 Posts: 2,241	I think what WADS56 was trying to say is that if both engines had same compression,heads,intake,cam,induction and exhaust etc. that the 347 would still make more power than the 351. Actually, a 347 really has 350 cubic inches of displacement but they didn't want to advertise it as a "350" __________________ '82 GT 351W (.060)Comp Cams 274* Extreme Energy cam, ported & polished heads w/ 1.94/1.60 valves 10.3:1 flat top pistons,stealth intake, Mallory dizzy,Holley 750dp carb, BBK shorties,Flowmaster exhaust,C-4 with 3700 stall converter, B&M pro shifter,8.8 rear, 4:10's, subframes, electric fan, powermaster alternator, 4 core radiator.

12-17-2002, 08:55 AM	#14
7000rpmisheaven Registered Member Join Date: Nov 2001 Location: germantown MD Posts: 283	I am not trying to argue at all. I'm just curious cause I don't understand why one would make more power than the there. Even being a 350 as you say I still don't understand. If every part of the setup thats affects flow or power production on both motors (compression, heads, cam, ...etc), why will one make more power than the other. __________________ 85 GT 4bbl roller cam 2 ch. Flowmasters, O/R H-pipe Performer intake and carb milodon water pump, FMS 9mm wires, aluminum driveshaft, king cobra clutch

12-17-2002, 09:28 AM	#16
7000rpmisheaven Registered Member Join Date: Nov 2001 Location: germantown MD Posts: 283	Thanks. I had a feeling it was something like that. Can someone tell me which is better for longevity smaller or larger crank journals. I would guess smaller. __________________ 85 GT 4bbl roller cam 2 ch. Flowmasters, O/R H-pipe Performer intake and carb milodon water pump, FMS 9mm wires, aluminum driveshaft, king cobra clutch

12-18-2002, 07:52 AM	#20
Mustang_289 Registered Member Join Date: Sep 2001 Posts: 512	I'm not an expert by any means - but I've heard a punched out 302 to 347 is a good powerplant but it's not reliable over the long-term. my 2cents - all these posts pretty much say the 347 and 351 are pretty close. if you've got both blocks I would suggest going with the 351 as it can always be stroked to 392 or 408 I believe.

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