Compression of 520 with P51's - Page 2 - 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 #16 of 26 (permalink) Old 03-03-2012, 08:00 PM Thread Starter
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I'm extremely happy with what it made, was just wondering because a friend of mine said the numbers sounded inflated and that he thought 850 was more realistic. After chasing our tails all morning we decided to leave the timing at 30.
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post #17 of 26 (permalink) Old 03-03-2012, 08:53 PM
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whimpy





lol j/k
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post #18 of 26 (permalink) Old 06-17-2012, 12:05 AM
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Problem Solved! The two wires going to the distributor were backwards, swapped them and fixed the popping. With 30 degrees timing it put out 921 hp and 720 tq at 6,200 rpm. Torque peaked at 728 at 6,000 and 899 hp. Do these numbers sound right or do they seem a bit high? I wasn't expecting it to make over 850......
Thats pretty killer numbers right there! I had the same backwards wires problem on my boat when i installed the MSD digi-7 at the end of last year. I called MSD and they told me to check those two wires first - I thought it was a faulty box...
Right now I am in the process of a similar build with a true race engine builder and couldn't be more excited. 505, 13.3-1, TFS streets, custom cam (dont know specs yet but supposingly far faster ramp profile than my old Schnieder solid roller "turtle!" cam... .650ish and I think like 275ish@.050...
My Builders best guesstimate is 750hp and 800 if we get really lucky, so my question to you is how much cam are you running, if you don't mind spilling "ish" details?
thx
Zach
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post #19 of 26 (permalink) Old 06-18-2012, 11:07 PM Thread Starter
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Cam specs are 274/284 @ .050 .727/.727 on a 112 ls, it's a Kaase custom grind.
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post #20 of 26 (permalink) Old 06-21-2012, 12:20 AM
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Cam specs are 274/284 @ .050 .727/.727 on a 112 ls, it's a Kaase custom grind.
Thanks man, I'm interested to see what how much more the P51 makes on a somewhat similar build. Hopefully in a month or so ill get back and let the difference be known.
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post #21 of 26 (permalink) Old 04-11-2013, 02:30 PM
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What pistons are you running. I want to go 520, been talking with Kaase, but I want a more street freindly 10.5 1. The cam specs he was talking are right up there with yours though, if not the same.

Just wondering what the HP diff would be by dropping the comrpession down. Kaase said it would make over 800?
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post #22 of 26 (permalink) Old 04-12-2013, 12:43 AM
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What pistons are you running. I want to go 520, been talking with Kaase, but I want a more street freindly 10.5 1. The cam specs he was talking are right up there with yours though, if not the same.

Just wondering what the HP diff would be by dropping the comrpession down. Kaase said it would make over 800?
For every point of comp you go up its worth about 25hp!

Im doing a similar build to you, and kaase also gave me a cam spec @ .050 274 with 740 lift...........he calls it the K2 cam.

I told him all the details and said 90% street car so im big time.
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post #23 of 26 (permalink) Old 04-12-2013, 07:44 AM
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Did you ever figure out your actual compression, 13 or 15?
Either way, using the 25 hp per comp pt, Bob460 and I are still looking at over 800 HP on pump gas using this build with lower compression.

THAT ROCKS. Good on ya. Pesky wires. That multi colored plastic spaghetti scares the crap out of me. I have to re wire the whole car, I can only imaging what will come on, and what wont come on when I push a button
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post #24 of 26 (permalink) Old 04-13-2013, 07:14 PM
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Comp

I have a 524 with Dimond flat top piston .0405 over and .018 in hole. Kaase P51 heads decked .010 and compression is 12.8.
This was checked by local machine shop
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post #25 of 26 (permalink) Old 01-29-2014, 11:14 AM
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Bah! P-51's suck. You don't want those!

(sarc)


good job!

1969 Mustang Mach 1
552ci w/ P-51's, 13:1, C6, NOS
9.77@135 na
5.87@120 1/8th on a 175 nos plate
Out in the southwest desert
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post #26 of 26 (permalink) Old 01-30-2014, 12:17 PM
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4th,
What headers are you running with the P-51s. I have the same car (stock) and was considering a 429/460 swap.
Thanks,
Ray
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