501 vs. 521 - 460 Ford Forum
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post #1 of 11 (permalink) Old 05-26-2014, 09:50 PM Thread Starter
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501 vs. 521

Hey guys building a new motor with a sat of BT heads CJ ports just was wondering if I would see a big difference or if any between a 501 vs 521 bottom end have everything for the 501 need to by pistons for the 521 that y I'm asking
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post #2 of 11 (permalink) Old 05-27-2014, 12:32 PM
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Kind of depends what you're trying to achieve. Each has advantages or disadvantages depending on application.



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post #3 of 11 (permalink) Old 05-27-2014, 04:03 PM Thread Starter
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Like to get some mid nines car is about mid 2900lbs can u be more specific trying to achieve this on motor
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post #4 of 11 (permalink) Old 05-27-2014, 06:06 PM
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Like to get some mid nines car is about mid 2900lbs can u be more specific trying to achieve this on motor
okay, soooo....drag racing. Intended rpm range? Cast or forged? Internal or external balance? Compression ratio desired?


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post #5 of 11 (permalink) Old 05-27-2014, 08:31 PM Thread Starter
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This is a all out race car with aluminum rods forged pistons and crank don't want to go no bigger than a 0.30 bore all of what u ask is really not a concern. I more looking at what to expect in hp & tq knowing that some things will be different between the two or should I say is it worth spending the money on another set of piston if I have everything for the 501 kit and yes drag racing 1\4 mile mostly

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post #6 of 11 (permalink) Old 05-27-2014, 09:09 PM
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This is a all out race car with aluminum rods forged pistons and crank don't want to go no bigger than a 0.30 bore all of what u ask is really not a concern. I more looking at what to expect in hp & tq knowing that some things will be different between the two or should I say is it worth spending the money on another set of piston if I have everything for the 501 kit and yes drag racing 1\4 mile mostly
WOW.... Not a concern but yet you want max power...

Carl builds these things and can't help unless you list what your looking for a 501 can make big power or small power what your asking is a loaded question without the proper knowing what your looking for....

Tag and ins it's a street car, how it gets there does it really matter?

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post #7 of 11 (permalink) Old 05-28-2014, 05:20 PM Thread Starter
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No I don't want max power I did state what l was trying to do I asked about hp & TQ between the to I'm sure Carl has been doing this and appear to have been in business long enough to read between the lines. Like u said they have been doing this for a long time I would think it would be as simple as saying u would need this much compression,etc for a 501 to get what u need and vise versa for a 521 or maybe u forgot to introduce urself as their new spokesperson
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post #8 of 11 (permalink) Old 05-28-2014, 05:53 PM
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No I don't want max power I did state what l was trying to do I asked about hp & TQ between the to I'm sure Carl has been doing this and appear to have been in business long enough to read between the lines. Like u said they have been doing this for a long time I would think it would be as simple as saying u would need this much compression,etc for a 501 to get what u need and vise versa for a 521 or maybe u forgot to introduce urself as their new spokesperson
It's not a pissing match to me but your the one asking for free advice...


P.S hi I am so and so And build this and that

Tag and ins it's a street car, how it gets there does it really matter?

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post #9 of 11 (permalink) Old 05-28-2014, 07:04 PM Thread Starter
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Ur advise would have been greatly appreciated but don't see where u give any u just spoke on what u assumed Carl might say or think and it also seem like u clearly didn't read what I was asking
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post #10 of 11 (permalink) Old 05-28-2014, 07:17 PM
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Good luck with your build

Tag and ins it's a street car, how it gets there does it really matter?

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post #11 of 11 (permalink) Old 06-23-2014, 09:56 AM
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Hey guys building a new motor with a sat of BT heads CJ ports just was wondering if I would see a big difference or if any between a 501 vs 521 bottom end have everything for the 501 need to by pistons for the 521 that y I'm asking
20 extra cubic inches should yield appx. 30 more horsepower (assuming you are at 1.5 hp/cu inch).

Mid nines at 3000 lbs weight would require about 700 hp.

Both the 501 or 521 can easily get to 700+ Hp.
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