A little advice would be good.

dp88

New Member

Oct 30, 2008

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Oct 30, 2008

#1

• Oct 30, 2008

• #1

347&351W questions

I have searched but have not found exactly what i am looking for. I am in a dilema of rebuilding...worn piston rings i am wanting to do a 347 or 351 build but dont know which would suit me better. I am wondering if gt40 heads and intake will flow well enough for a 347 (i have a pair sitting here) or if they will fit and/or work well with a 351. I am staying fuel injected but stepping to larger injectors and need something streetable. Other questions include is the extra weight of the 351 woth the displacement and do i need a separate fuel management system to run the 347 and will 24lbs injectors work fine? Any help is much appreciated

 

90topdown

Member

Feb 16, 2006

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Philadelphia, PA

Oct 31, 2008

#2

• Oct 31, 2008

• #2

ALL depends on what you want out of the car. What are your goals?

How much HP are you looking to make??

What is your definition of "streetable"?

 

2000xp8

SN Certified Technician

Aug 8, 2003

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NJ

Nov 1, 2008

#3

• Nov 1, 2008

• #3

To really get your moneys worth of a 347 or 351 you are going to need better flowing parts than gt40 suff.
Nothing wrong with using those parts, but don't be suprised if you car doesn't make any more power than a 302 with better parts.

Adding weight going to the 351, and using medicre parts really isn't worth the trouble.

Good news is that if you have a real gt40 intake (tubular) it can be sold for an even swap for a better intake, to get better heads though, you are going to take a bath unless you have gt40x's now.

 

8

83T-top

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Oct 2, 2008

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Nov 2, 2008

#4

• Nov 2, 2008

• #4

I agree with 2000xp8, the only reason I would go with a 351 is if your going to try and make more power then the 302 block can handle. If your not going to try and get everything you can out of the 351, stay with the 347. I'm looking to do the same as you. I was just gonna put a set of aluminum heads on the motor I have now, but the more I think about it I think I'm gonna sell it and do a stroker. I was just reading an article a while ago and they built a 347 with the aluminum Z heads, comp cam xe282hr cam, victor jr. intake manifold, 750 holley, 1 3/4 headers and I think the compression was 10 or 10.5:1 and made 478hp and 434tq. The way it sounds you probably want less cam for driveability, unless you want more then that I'd stick with the stroker route.

 

dp88

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Oct 30, 2008

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Nov 2, 2008

#5

• Nov 2, 2008

• #5

thanks 83ttop the article you mentioned sounds more my route. I've always wanted to stay fuel injected though just because the ease of it already being fuel injected. sorry for my ignorance but is it hard to go to carb from fuel injected? Im looking for low to mid 400 hp with no nos or blower.

 

P

P-Zero

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Oct 31, 2008

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Michigan

Nov 2, 2008

#6

• Nov 2, 2008

• #6

If the cars already setup for it there should be any issues going to carbed from FI. You will need a carb and an intake. And youre done. THe distributor mounted ignition module will take care of the rest for you. OR you can get an MSD6AL and youll have soft touch rev control and all the other BS that comes with it. Just disconnect the FI wireharness and youre done. Its easy. Now tuning a carb thats another story. But edelbrock has videos on their site explaining how to tune em, its not that hard really.
-P.
PS: Dont forget to pump the gas when you start it

 

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83T-top

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Oct 2, 2008

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Nov 2, 2008

#7

• Nov 2, 2008

• #7

dp88 said:

thanks 83ttop the article you mentioned sounds more my route. I've always wanted to stay fuel injected though just because the ease of it already being fuel injected. sorry for my ignorance but is it hard to go to carb from fuel injected? Im looking for low to mid 400 hp with no nos or blower.[/QUOTE


You can stay fuel injected and still produce those numbers, I was just using that as an example. If mine was fuel injected I would stay that way too. Glad I could help

Click to expand...

 

strtrcr50

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Jun 21, 2006

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Previously from Dirty Jerzey exit 7a

Nov 3, 2008

#8

• Nov 3, 2008

• #8

As far as intakes go on a 347, MM&FF did a intake manifold shootout on a 347. Interesting read.
Super Intake Shootout - Muscle Mustangs and Fast Fords

 

dp88

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Oct 30, 2008

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Nov 3, 2008

#9

• Nov 3, 2008

• #9

the ported gt40 did better than i would have thought compared to the others.