P51 Head Question

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P51 Head Question

Post  Tore on February 4th 2012, 3:32 pm

Here is something I was thinking about. At what point would you draw the line and say the P-51 heads are not efficient for this build and we move onto an A Head or Boss Head? Cubic Inch and compression size is what I was wondering about. I am talking a race engine not something with 600ci for the street.



Thanks Tore

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Re: P51 Head Question

Post  rmcomprandy on February 4th 2012, 4:02 pm

Tore wrote:Here is something I was thinking about. At what point would you draw the line and say the P-51 heads are not efficient for this build and we move onto an A Head or Boss Head? Cubic Inch and compression size is what I was wondering about. I am talking a race engine not something with 600ci for the street.

Thanks Tore


In my opinion ... low to mid 500's in cubic inches and around 900 horsepower.
One can certainly use them on a larger engine and get a bit more power however, an "A" head is much more suited for it.

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Re: P51 Head Question

Post  Lem Evans on February 4th 2012, 5:50 pm

Tore wrote:Here is something I was thinking about. At what point would you draw the line and say the P-51 heads are not efficient for this build and we move onto an A Head or Boss Head? Cubic Inch and compression size is what I was wondering about. I am talking a race engine not something with 600ci for the street.



Thanks Tore


It'd depend on your HP goals....if you want 1,000-1,100 HP from a 600"ish engine moving beyond the P51 cyl. heads would be the option.
While a 598" P51 headed engine will make less HP per c.i.d. than a 555" version, the 598" will still make power.

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Re: P51 Head Question

Post  richter69 on February 4th 2012, 6:27 pm

depends also if you want to save some coin and use existing headers, intake etc, as said its all in what your trying to accomplish.
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Re: P51 Head Question

Post  Tore on February 5th 2012, 1:31 pm

Thanks to all who replied.


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