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how much HP can a 5.0 block take?


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#1 Burtle1

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Posted 03 August 2012 - 07:17 PM

I'm wanting to take a 5.0 block have it bored and stroked into a 347.

Is it possible to get 500-600 hp out of these ?




thanks!

#2 scott2001GT

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Posted 03 August 2012 - 07:23 PM

I've always heard 500 with the stock 5.0 block
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#3 Kendar

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Posted 03 August 2012 - 07:28 PM

I assume we're talking about a Fox era 5.0. I've always heard 500 also. 600 for a 4.6 block, but who knows how long that would last.

#4 Jamey

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Posted 03 August 2012 - 07:29 PM

In all honesty i think they can handle well over 500 hp without breakage. it has a ton to do with the tune setup and rpm
keep the rpm,s below 6000.

#5 Burtle1

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Posted 03 August 2012 - 07:34 PM

thanks for the fast replies guys.



yes, I'd be getting a 5.0 block from the junk yard. The 95 gt mustang i'm gonna buy doesn't have a motor or transmission.


Was just trying to find out how much HP it could handle. I want to stroke it to a 347.

#6 scott2001GT

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Posted 03 August 2012 - 08:15 PM

That's true what was stated. Rpms and tune plays a big roll. A 4.6 won't like 600. People say 450rwhp but they have gone on less and lasted over that.
2001 Mustang GT(11.649 @ 119) Few bolt-ons. --- Tuned by -Bobcat-

Big Thanks to STL Mustangs and Wagon Wheel Performance

More than a hundred grand under the hood.



#7 Jamey

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Posted 03 August 2012 - 08:17 PM

And there are several different 5.0 blocks the strongest that i have had experience with have the xxx in the lifter valley

#8 1BADLX

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Posted 03 August 2012 - 08:20 PM

I have had over 525 for years and getting ready to turn it up more soon. A good tune and low rpms help.
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#9 2.3svonightmare

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Posted 03 August 2012 - 08:37 PM

Upper 500s are good went with 18lbs boost with meth injection ran a 682 hp but when at the track on second run split the webbing. So I would stay below 650 or so. Good luck with the fun, Make sure you have a lower block support. Cheers :cheers:

#10 gpsupercharged

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Posted 03 August 2012 - 09:18 PM

Tune, RPM, Balance and Luck. 450+rwhp to 515 never split a block. Just broken pistons and blown head gaskets. :barf: good luck.
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#11 trainu

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Posted 03 August 2012 - 10:15 PM

My car made 523 who on 15 psi with 64mm turbo. Car went 10.7 at 130 with c4. Most of the time I run around on ten pounds so 400+ whp. On 10-11 psi at track with five speed I wen't 12.8 at 124. Just get a good tune and don't rev to the moon. Lawerence used to run 135+ mph in a hatchback, but I believe he split a few blocks in the lifter valley.

#12 Z06-KLR

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Posted 03 August 2012 - 11:55 PM

save yourself the headache and save for a good block. cheaper in the long run... no need to polish a turd!!
bone stock 351
i'll be surprised if i can get in the 12's

#13 1BADLX

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Posted 04 August 2012 - 09:11 AM

I agree, My motor is older so i am just going to use it up. I have already started gathering parts for a dart 363 build. So i am just trying to see how much it will handle.:cheers:
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#14 trainu

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Posted 04 August 2012 - 11:13 AM

Going to run mine for a few more years and then want to go Dart 363 with twin 60s. At least that is the current plan.

#15 HRS PLY

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Posted 04 August 2012 - 01:50 PM

there is alot of diffenent thoughts on what a stock block will take. its all a roll of the dice. I have split two of them. If your gonna run a power adder dont waste money on a stroker kit. everyone knows you will break it in a matter of time.
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#16 Blackfox

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Posted 08 August 2012 - 09:02 AM

there is alot of diffenent thoughts on what a stock block will take. its all a roll of the dice. I have split two of them. If your gonna run a power adder dont waste money on a stroker kit. everyone knows you will break it in a matter of time.


I never even understood why people even stroke the stock block.
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#17 HRS PLY

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Posted 08 August 2012 - 09:15 AM

I never even understood why people even stroke the stock block.

Maybe a 347 with 10/1 comp and no power added would hold up for a long time. If your using a power added then don't waste your money. I went high 10's on a 306 with stock rods and crank.
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#18 NOMO 6

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Posted 08 August 2012 - 01:38 PM

Ran 10.6 @131mph with a turbo stick shift 306 "stock rods and crank unbalanced no girdles" for a few years and never broke mine. Sold the motor as a n/a setup and runs great in a guys car still. Keep it from detonation at all costs and it will live for a long time. I ran a meth kit just as added safety not for the added power. :cheers:
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#19 Outlaw5.0

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Posted 19 August 2012 - 01:46 PM

I have always herd around 500 horses.. I do have a 302 with the xxx in the lifter valley and could not be any happier out of it.. Good block very tuff.. Takes a lot of abuse even when I bored it 40 over..

#20 kev92gt

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Posted 20 August 2012 - 05:05 PM

rpm is the death of a stock block not so much the hp




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