347 or 351

W

wgpaintballer

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Jul 21, 2006

#1

• Jul 21, 2006

• #1

Rite now im looking into engine ideas since im looking for a stall converter.. I either want to go for a 347 with nos or a 351 which i will spray too.. i may stroke the 351 but i still want to be able to drive it around town with high teens to low 20;s in mpg.. im looking for 11's if not 10s possibility.. hopefully high 300;s on engine at the rear wheel. it will also still be efi

 

Aliate X

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Jul 21, 2006

#2

• Jul 21, 2006

• #2

If your going to spray it the 351 is a better idea, b/c the stock 351 blocks are far stronger than any stock 302 block. If you were to stroke and spray a 302 based motor, you would have to go with an aftermarket block.

 

Grn92LX

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#3

• Jul 21, 2006

• #3

The older 351 blocks are stronger. The newer ones, according to Rick91GT, are no stronger than a late model 302 block.

Stay 347 unless you're gonna stroke the 351. Same parts on each engine and the 347 out powers and out accelerates the 351.

You can easily make high 10 second power with a n/a pump gas 347 and not even need the squeeze.

 

bluevenom867

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#4

• Jul 21, 2006

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If you dont have a bunch of 302 bolt-ons,the 351W will be cheaper to set-up.

You would be able to use the stock crank and rods (with ARP bolts of course) or you could get some SCAT I-Beams with the pressed pins (no need to waste money on floating pins for a mild build).Have it bore/honed and balance be a good machine shop,and if you go with ARP studs or bolts for the mains,have it line bored with them.

And Grn92LX,please explain your theory further?

As I see it,the 351W will have a longer stroke,make more torque,and with a larger cam make that torque at a higher rpm.Witch will produce more power.The wieght differance isnt enough for the 347 to go by the 351W.

edit:Oh,the down side is of course the larger hiegth witch can make changing plugs a little tricker and may cause some hood clearance problems.

 

Grn92LX

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#5

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Go on corral.net and PM jay allen. He did a test a while back and the 347 was faster. Not my theories, its his proof He will explain it.

 

bluevenom867

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#6

• Jul 21, 2006

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Is it in a thread?

 

Grn92LX

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Yes it is, but not a recent one.

 

bubba-dough

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#8

• Jul 22, 2006

• #8

wgpaintballer said:

but i still want to be able to drive it around town with high teens to low 20;s in mpg..

Click to expand...

But yeah I vote for the 351 based stroker. Hindsight is 20/20.

Aliate X said:

If you were to stroke and spray a 302 based motor, you would have to go with an aftermarket block.

Click to expand...

It would be wise to....but not a mandate. I am using the stock block and it will be a year in 2 months since I had the 347 put in. And it is a DD as well as some track time. It now has just over 7,000 miles on it.

 

Aliate X

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Jul 22, 2006

#9

• Jul 22, 2006

• #9

Grn92LX said:

Go on corral.net and PM jay allen. He did a test a while back and the 347 was faster. Not my theories, its his proof He will explain it.

Click to expand...

Yup, I second that, I saw the thread. They went a few tenths faster on a 347 due to RPM's I belive.

 

bluevenom867

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#10

• Jul 22, 2006

• #10

Ok,I read the first couple of pages.

Jay's was the only working example I saw.

We already know all this,but your forgeting in the real world,347 and 351W DONT have the same parts.

351W is still the larger motor,and should be treated as such and given a larger cam.

The differance with the mains and fricton....phstt.Big deal,most guys arent revving to 6500rpm on the street,Ill take the torque thank you.

Also,when e said he used a 351C crank back in the day,the same could apply to the 351W with spacers.Hell you could even get a spacer to reduce the 351W main down to 302 main (2.25") and offset grind the crank to get a 351W with lightwieght rotating mass.

 

Woodrow

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Jul 22, 2006

#11

• Jul 22, 2006

• #11

347 is going to win since the rotating assembly is lighter, against a 351. If your going put a 351 in might as well stroke it.

 

slammed coupe

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JERZY

Jul 24, 2006

#12

• Jul 24, 2006

• #12

you can do a stock bottem end 351w with heads,cam,intake,and carb and put 350 rwhp and go low 11's. that is what my notch does with a c4 trans taking the car up to 7400 rpms. so i would go with a 351.

 

88Stang331

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#13

• Jul 24, 2006

• #13

First of all...10 seconds with 20+mpg...

Second, if a budget build up is your thing, go with the 351, and put some nice heads, cam and intake on it. (by nice i mean not 302 items) Maybe even stroke it out to a 408

 

W

wgpaintballer

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#14

• Jul 24, 2006

• #14

thanks for everything

well.. with some major help i have decided in the root in going to go in.. it will be either 331 or 347 stroker all forged internails.. with a turbo setup hopefully one day