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post #1 of 20 Old August 25th, 2010, 05:09 PM Thread Starter
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5.0 Stock Bottom End Strength

Hey guys, I was just curious if anyone knows how much the stock rotating assembly and block of a 5.0 can handle. I think I remember over 400rwhp is pushing it. What about rpm's? I have heard anything over 6,500 rpm's is too much strain on the motor. What do you think?
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post #2 of 20 Old August 25th, 2010, 05:12 PM
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Hey guys, I was just curious if anyone knows how much the stock rotating assembly and block of a 5.0 can handle. I think I remember over 400rwhp is pushing it. What about rpm's? I have heard anything over 6,500 rpm's is too much strain on the motor. What do you think?
are you talkin about a new 5.0..?

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post #3 of 20 Old August 25th, 2010, 05:14 PM
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big torque, or big rpm, or any combo of the two. I've seen a 270hp motor split, and have heard of people getting up to 700, im sure it all depends on the condition of the motor.


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post #4 of 20 Old August 25th, 2010, 05:20 PM Thread Starter
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I was refering to the fox body 5.0's. I was curious on the potential of the stock assembly w/o anything forged steel or modified.
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post #5 of 20 Old August 25th, 2010, 05:25 PM
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big torque, or big rpm, or any combo of the two. I've seen a 270hp motor split, and have heard of people getting up to 700, im sure it all depends on the condition of the motor.
Something was terribly wrong with a motor that split at 270hp.

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post #6 of 20 Old August 25th, 2010, 05:40 PM
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500 RWHP max.



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post #7 of 20 Old August 25th, 2010, 06:08 PM Thread Starter
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What about a max rpm that can be acheived safely w/o engine damage? Or simply put, what would be over-spinning it?
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post #8 of 20 Old August 25th, 2010, 06:11 PM
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Depends...not a set number...

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post #9 of 20 Old August 25th, 2010, 06:17 PM
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this may not be true, but i read that the engine can spin up to 6k safely, but the stock valves will start to float around 5k due to the weak factory springs. any truth to that?

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post #10 of 20 Old August 25th, 2010, 06:23 PM Thread Starter
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Not over-spinning it for hp or shift points, rather the highest rpm that can be acheived w/o causing damage or running a heavy risk of destroying a motor all together. Kind of like a "DO NOT GO PAST THIS ENGINE SPEED" rule of thumb. I know the Ford Racing X and Z cams make power up to 6,500 rpm's. Is that a bit too much for the stock rotating assembly? Again, I am just curious on how much these little shortblocks can handle.
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post #11 of 20 Old August 25th, 2010, 07:27 PM
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Something was terribly wrong with a motor that split at 270hp.
Bad balance???

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Depends...not a set number...
This is the most true statement... Every motor is different. I could say 500, but you could easily break at 4. I repeat... EVERY MOTOR IS DIFFERENT. The balance has a lot to do with it too.

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post #12 of 20 Old August 25th, 2010, 07:42 PM Thread Starter
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Yeah, I agree. I know balance of the crank and condition of the engine play large roles in engine durability when racing. Still, if you had lets say, H/C/I on a well balanced motor that was running optimal with a strong valvetrain, would it be safe to take the stock bottom end components to 6,500 if the motor made peak power there? When is it a good time to upgrade the crank, rods, and pistons?
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post #13 of 20 Old August 25th, 2010, 08:10 PM
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i beat on mine all day and its still going. first time ever to the track and i ran a best of 12.4 out of 3 passes and i make 296 to the wheels. ive also seen the tac go well above 6. mind you i dont care if this engine takes a shit

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post #14 of 20 Old August 25th, 2010, 08:25 PM
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Stock rev limiter is 6250 rpms, so you don't have too much worry there. The only way to rectify that is with a chip removing it. Stock tachs are not accurate at all. I hit 6250 in my car when the tach says 7.

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post #15 of 20 Old August 25th, 2010, 08:39 PM Thread Starter
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Yeah, I hear ya'. The stock tach. has a mind of it's own. Sometimes I have actually seen my needle hesitate when downshifting. So, does every fox body 5.0 have a built in rev limiter at 6,250? I have a MSD 6AL w/a 6,200 pill, so I have never seen it go off.

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post #16 of 20 Old August 25th, 2010, 08:46 PM
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Every EFI fox does. At 6250, the computer pulls fuel.
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post #17 of 20 Old August 25th, 2010, 08:55 PM
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Stock rev limiter is 6250 rpms, so you don't have too much worry there. The only way to rectify that is with a chip removing it. Stock tachs are not accurate at all. I hit 6250 in my car when the tach says 7.
not going by the stock tach and the limiter is gone

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post #18 of 20 Old August 25th, 2010, 09:24 PM Thread Starter
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not going by the stock tach and the limiter is gone
Do you mean what if a 5.0 Mustang had an aftermarket tach. and the stock limiter was tuned out? I am still interested as well. Is there anyone out there running a stock bottom end and running numbers past 6,250 rpm?
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post #19 of 20 Old August 25th, 2010, 10:46 PM
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Do you mean what if a 5.0 Mustang had an aftermarket tach. and the stock limiter was tuned out? I am still interested as well. Is there anyone out there running a stock bottom end and running numbers past 6,250 rpm?
Maybe a member "E3 SEAN" He runs basement 10's with the stock block if I'm not mistaken. He prbly spins it up to about that if not more


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post #20 of 20 Old August 26th, 2010, 06:21 AM
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Do you mean what if a 5.0 Mustang had an aftermarket tach. and the stock limiter was tuned out? I am still interested as well. Is there anyone out there running a stock bottom end and running numbers past 6,250 rpm?
i have an aftermarket tac and have spun it abouve but its not making and power

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