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Author Topic: 347 or 408?  (Read 5882 times)

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Offline STREETREBEL

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347 or 408?
« on: September 06, 2012, 08:28:02 PM »
I have a 302 in my Pinto now. But, not enough power for me.
Soooo!
Should I put a 347 or a 408 in it?
I'll have to buy new headers anyway. So it seems like the same cost
between the two.
Does the 347 torque like the 408?
Lets hear it!
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Offline 79prostreet

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Re: 347 or 408?
« Reply #1 on: September 06, 2012, 09:40:46 PM »
I'm not sure if you can build a 302 into a 408, 347 for sure. I'm needing to decide if I want my 351w a 408 or 427, need to do a little more research,
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Offline STREETREBEL

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Re: 347 or 408?
« Reply #2 on: September 06, 2012, 10:38:53 PM »
They are two different engines.
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Offline vonkysmeed

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Re: 347 or 408?
« Reply #3 on: September 07, 2012, 12:30:09 AM »
Quote from: STREETREBEL on September 06, 2012, 10:38:53 PM
They are two different engines.
with some interchangeabl e parts...   I prefer the 351 (punched out to what you want) as there is no replacement for displacement.   This from a pinto owner with a 351 in it.
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Offline jim72

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Re: 347 or 408?
« Reply #4 on: September 07, 2012, 09:17:00 AM »
C.I. equals torque potential : torque rules the streets !!!
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Offline STREETREBEL

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Re: 347 or 408?
« Reply #5 on: September 07, 2012, 10:16:08 AM »
Does a 347 use a 351w crank?
 
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Offline vonkysmeed

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Re: 347 or 408?
« Reply #6 on: September 07, 2012, 10:44:15 AM »
Quote from: STREETREBEL on September 07, 2012, 10:16:08 AM
Does a 347 use a 351w crank?
 

do not think so, there is not enough stroke length in the 302.  The deck height is taller for the longer stroke.  I still lust after my friends 351w that was pushed to 427 in his cougar.  If he ever wrecked the car, i had dibs on the motor. 
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Offline Bigtimmay

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Re: 347 or 408?
« Reply #7 on: September 07, 2012, 12:59:16 PM »
Quote from: STREETREBEL on September 07, 2012, 10:16:08 AM
Does a 347 use a 351w crank?
351w is 3.500" stroke 347 uses 3.400".   
As for the 2 engines in debate 347 an 408 have issues with the oil ring on the piston intersecting the rod pin and causing them to fail faster.They do make pistons that fix this but they cost a ton more then the standard stroker pistons.
With that being said can I suggest another solution and will still yield great torque/hp for your pinto and will not have the oil ring problem. A 393w will cost around the same as the 408 or 347 but the oil rings don't intersect the pin and really there wont be a huge difference between it and a 408 in HP or torque and it'll yield more power/torque then the 347 and wont have to rev as high to make the power.
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Offline Reeves1

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Re: 347 or 408?
« Reply #8 on: September 07, 2012, 09:58:55 PM »
Ford racing now has an all aluminum 351w block. Lots of aluminum heads out there.
Go all aluminum engine to save weight.
Go max bore. Stroke it. Big olde lumpy cam !
Lots of intakes & carbs to choose from.
Custom headers !

The above is what I'm thinking of for my 2nd build !
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Offline oldeguy

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Re: 347 or 408?
« Reply #9 on: November 28, 2012, 06:59:25 AM »
want's your budget? a 408 with heads that can breath, with a cam and intake to match would be awesume! but you'll need some nice sticky tires to put it to the ground and a chassis to take it!
I got a 2500 pound AC Cobra, went from a crate 302 to a 347 with Canfield 195CC heads, Comp X-tream cam, VicJr intake and a ProSystems carb...Sweet! 12.05 @ 119 mph with tires spinning (295 50 15's) from idle off start half way thru second gear. Now sure I'd want more power to weight ration for street/ BTW, chassis dyno'ed at 395 WHP! not bad for a 347!
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Offline Reeves1

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Re: 347 or 408?
« Reply #10 on: November 28, 2012, 08:43:45 AM »
I have not researched the 351w aluminum yet. Still working on the white one.

No budget. Spend whatever it takes.

My B2 engine has the 347 stroker kit. Bored .020 over. It's a 345 now. Builder also put a custom , mild, hyd cam (i kept asking for an agressive solid roller & max bore). It was also changed to the 351w fireing order. Releaves the stress on the 5/8 journal.
Original B2 heads, but lots of port work. They now flow as well as any after market heads. Stainless valves & more.
Without the windage tray (has one now) and a 750 dp Holley, dynoed out @ 473 HP & (I think) 416 TQ. ( will go over 500 HP with an 850 dp - it was tested on my engine)
Going to use that engine as is till I can get it re-built (again) the way I want.
Will max bore (not worried about it blowing up...if it does no big deal, just build another)
An agressive solid roller cam. Jump to at least an 850 dp Holley.

Used the new E-BOSS Edelbrock intake on the B2. Would like to have port work done. Pick up an OEM intake & have port work done. Then dyno, testing both.
Mine was test dyno with an OEM, but no port work was done to it. The E-BOSS gave more HP & a better TQ line. But the OEM liked going to 7k RPM.

Main reason I would like to build the all aluminum is the weight. I have glass fenders & looking for a glass hood. Failing a glass hood, I'd trim all the metal I could & acid dip it. Maybe the whole body.
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Offline oldeguy

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Re: 347 or 408?
« Reply #11 on: November 28, 2012, 12:17:59 PM »
No Budget!!!! fan...tastic!
call Woody at http://www.fordstrokers.com/ tell him what you want or are looking to do, he'll help you figure it out. I visited his shop a few years back, nice small shop, does all machine work in-house. builds only sbf...he started out building short block, now build carb to pan sbf stuff. 
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Offline Reeves1

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Re: 347 or 408?
« Reply #12 on: November 28, 2012, 02:09:19 PM »
No more sending an engine to the States for a build. Adds at least $1500.00 to the cost. Not counting GST.

I have several options up here. One being Barrie Poole in Ont. I wanted to get him to build my BOSS 302. But he was gone to Florida for the winter.
If Had known I would end up not finishing the car this past summer, I'd have waited till he was back for the summer.
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Offline Pinturbo75

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Re: 347 or 408?
« Reply #13 on: November 28, 2012, 02:33:10 PM »
Quote from: jim72 on September 07, 2012, 09:17:00 AM
C.I. equals torque potential : torque rules the streets !!!

id like to put that to the test........ pinto v8 against say,,, 140 ci......:D
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Offline johnbigman2011

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Re: 347 or 408?
« Reply #14 on: November 28, 2012, 04:19:42 PM »
I would like to see the test results as well ::)
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Offline cabecho

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Re: 347 or 408?
« Reply #15 on: November 28, 2012, 04:55:53 PM »
It all depends on how much power you want. and how much money you want to spend.
i have a speed shop and i can give you a few options that i have build and the price range too so that you can have on idea.
You can keep your 302. stroke it to a 347 and 0 deck the block, put sleeve orings, flat top pistons, with a good aluminum port and polish heads. and you can still put a NOS plate with 125 shot if you want, the motor will hold.
Or if you want to go to a high end motor, you can go get a 351W stroke it to a 427 ( they make a bigger stroker kit but i dont recommended unless you are using a forge block) with a 13-1 compression ratio, zero deck the block, sleeve orings, good big valves aluminum head port and polish, good intake with at list a 850 carb. and you can have a motor with easy over 600 hp, ( run lead on your fuel.) This set up is pretty much what i run on my pro-street, i have a forge dart block, with twister heads. small tunnel ram with a 950 demon. and i make 775hp all motor and is a motor that i have driving on the street with out a problem. have driving to work multiple times when my truck was broken.
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