P-51 Flow Numbers? - 460 Ford Forum
Jon Kaase Racing Engines Jon Kaase is considered one of the best minds in the world of Big Block Fords and has created many parts to help enthusiasts with their 460 based projects. Gentlemen start your questions…
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post #1 of 32 (permalink) Old 07-14-2010, 08:09 PM Thread Starter
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Lightbulb P-51 Flow Numbers?

Was wondering if anybody has any flow numbers or have seen what you can get out of a set if P-51s? Thanks!
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post #2 of 32 (permalink) Old 07-15-2010, 10:19 PM
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Over 400 cfm
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post #3 of 32 (permalink) Old 07-16-2010, 11:03 AM
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Originally Posted by Michael Enright View Post
Was wondering if anybody has any flow numbers or have seen what you can get out of a set if P-51s? Thanks!
It might seem like Jon is just advertising so, I can answer this one...

Maximum air flow is not the beauty of these heads - the air flows at .400", .500" are tremendous and it's over 400 cubic feet of air at only .600" of valve lift.
These are absolutely the best "Street/Strip", moderate valve lift heads of any brand I have yet seen; (excluding the hemi's).

Although, personally with extensive porting I have gotten a maximum of 434 intake and 260 exhaust at .750" valve lift. I have seen maximum air flows a little better than that with a steeper angle valve job but, then air flow somewhat goes away at the mid valve lifts.

EDIT: Lately some people have put these heads on some 550" or so racing only engines and gotten some very good, eye opening results.

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Last edited by rmcomprandy; 07-16-2010 at 11:07 AM.
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post #4 of 32 (permalink) Old 07-16-2010, 11:41 AM
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562 cid p-51

1.05 60 ' time no spray naturally aspirated around 2370-90 #'s
last saturday rough track out of the grove and hot .

http://www.youtube.com/watch?v=lCWrInhEthI
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post #5 of 32 (permalink) Old 07-17-2010, 05:11 PM Thread Starter
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The reason i was asking was i have a 521 with bme rods, bryant crank, and diamond pistons.. got the heads from lem, and as you all know, competition never gets slower so i was seeing what a port-job will gain me! We got almost 400 out of a set of scjs, i just didnt know if i could get that much jump up with p-51s or not. From what im seeing, im gonna port them for sure! Ill let the dyno tell us for sure! Thanks Guys
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post #6 of 32 (permalink) Old 07-17-2010, 07:04 PM
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What dia. is your intake valve?

B F Evans Race Parts
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post #7 of 32 (permalink) Old 07-18-2010, 04:21 PM Thread Starter
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intake is 2.25 and ex. is 1.76 right now. planning on a small shot of nos also. probably will change valves, just not sure to what size yet.
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post #8 of 32 (permalink) Old 07-23-2010, 05:19 PM
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The P51 heads start pretty much where MAX ported SCJ ends. The mid numbers are fantastic out of the box.
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post #9 of 32 (permalink) Old 09-23-2010, 10:25 AM
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i have just ordered a set of p51 i couldnt resist especially with the dollar being so good, cant wait to see them in the flesh
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post #10 of 32 (permalink) Old 09-23-2010, 07:12 PM
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They are really nice heads for the price. I got them a few months ago and here are some pictures I took:










2006 Mustang GT
572 P51 BBF 924 hp @ 6900 rpm
8.579 @ 158.78 mph
My Build: www.psfracer.com
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post #11 of 32 (permalink) Old 09-23-2010, 10:32 PM
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I got the Double D version.........

69 Grande'
P51 headed 563
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post #12 of 32 (permalink) Old 09-23-2010, 11:52 PM
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Talking Want some

I would like the part number for those, so I can order them.

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post #13 of 32 (permalink) Old 09-24-2010, 08:25 AM
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I would like the part number for those, so I can order them.
look on jon kaase website there is heaps of info there or maybe ask lem evans on here about them
also thanks pfsracer for the pics it makes the hair on m y neck stand up
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post #14 of 32 (permalink) Old 09-24-2010, 10:51 PM
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That rocker system looks like a sweet set up!
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post #15 of 32 (permalink) Old 09-25-2010, 12:51 AM
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That rocker system looks like a sweet set up!
shaft!
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