P51 guys

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Re: P51 guys

Post  DFI429 on January 18th 2014, 5:23 pm

richter69 wrote:...track opens in 2 weeks.....

Lucky... after a "warm" snap (40s) it's been snowing all day up here, and single-digit lows coming again this week..  Rolling Eyes 

richter69 wrote:Glad i dont live up north where there is so much free time to sling shit on the interwbz lol.

I thought you were a post count champ??!  Ha..  Wink
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Re: P51 guys

Post  richter69 on January 18th 2014, 5:31 pm

i am, no one can catch me.......
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Re: P51 guys

Post  DFI429 on January 18th 2014, 5:41 pm

How could I mistake it.. forum ET.. lol
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Re: P51 guys

Post  69F100 on January 18th 2014, 5:49 pm

richter69 wrote:Sorry for my lack of involvment, im working on 5 different cars right now, track opens in 2 weeks.....

First 235 race in march 3rd and first no prep is march 29th......... Glad i dont live up north where there is so much free time to sling shit on the interwbz lol.



The track here is open all year long  Laughing 
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Re: P51 guys

Post  cool40 on January 18th 2014, 7:53 pm

Damn...about 40* here.  Sad 
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Re: P51 guys

Post  IDT-572 on January 18th 2014, 9:36 pm

I posted this on the other site for a little comparison.................

This is what they say 1003 hp should run...........

Strait off the Wallace calculator, not that I think it is and end all answer but i find it interesting what it says........... this was copied and pasted right off their site

Acceleration Calculator
Weight is as the car sits at the line: driver and gas in the car.
Horsepower (HP)1003 Weight 3167 (lbs) Shifts 1 Tire height 29.5 (inch.) Gear 4.30


Power to Weight Ratio: 3.15
60 Foot E.T. : 1.19
1/8 Mile E.T. : 5.39
1/8 Mile Trap Speed : 126.15
1/4 Mile E.T. : 8.54
1/4 Mile Trap Speed : 157
1/4 Mile Trap RPM : 7,691

This is almost exactly how my car runs............
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Re: P51 guys

Post  richter69 on January 18th 2014, 10:06 pm

Seems legit..
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Re: P51 guys

Post  cool40 on January 18th 2014, 10:07 pm

Happy dyno ...
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Re: P51 guys

Post  richter69 on January 18th 2014, 10:17 pm

p51s are a waste of money and time......
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Re: P51 guys

Post  cool40 on January 18th 2014, 11:41 pm

richter69 wrote:p51s are a waste of money and time......
seems legit............. Laughing 
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Re: P51 guys

Post  dfree383 on January 19th 2014, 12:14 am

cool40 wrote:
richter69 wrote:p51s are a waste of money and time......
seems legit............. Laughing 

Good Luck...... haters gonna hate
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Re: P51 guys

Post  yellowhorse7 on January 19th 2014, 12:19 am

cool40 wrote:Happy dyno ...

And they say I'm the trouble maker, lol
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Re: P51 guys

Post  cool40 on January 19th 2014, 12:24 am

yellowhorse7 wrote:
cool40 wrote:Happy dyno ...

And they say I'm the trouble maker, lol
who said? i thought you was the mf'r guy..... Laughing 
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Re: P51 guys

Post  Dave C. on January 19th 2014, 12:43 pm

I hate to hear the bad news about the P51... I was thinking about buying a set.

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Re: P51 guys

Post  jbozzelle on January 19th 2014, 4:07 pm

so my 514 w/P-51's may be weak but it's paid for.........

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Re: P51 guys

Post  yellowhorse7 on January 19th 2014, 5:02 pm

Sad to see that all everyone got out of this is a perception that P51's are weak. No one ever said that. In fact, the whole point of the discussion was ignored and really never answered. EXACTLY HOW MUCH BETTER, AND WHERE, ARE THEY BETTER THAN SCJ's. Blake and John are examples of people making them work. Yes they will pick up but not enough to substantiate an "upgrade".
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Re: P51 guys

Post  whitefield on January 19th 2014, 5:09 pm

yellowhorse7 wrote:Sad to see that all everyone got out of this is a perception that P51's are weak. No one ever said that. In fact, the whole point of the discussion was ignored and really never answered. EXACTLY HOW MUCH BETTER, AND WHERE, ARE THEY BETTER THAN SCJ's. Blake and John are examples of people making them work. Yes they will pick up but not enough to substantiate an "upgrade".

X2 although it made for a good read IMO !
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Re: P51 guys

Post  IDT-572 on January 19th 2014, 5:43 pm

yellowhorse7 wrote:Sad to see that all everyone got out of this is a perception that P51's are weak. No one ever said that. In fact, the whole point of the discussion was ignored and really never answered. EXACTLY HOW MUCH BETTER, AND WHERE, ARE THEY BETTER THAN SCJ's. Blake and John are examples of people making them work. Yes they will pick up but not enough to substantiate an "upgrade".

My opinion is from my hands on experience is, out of the box there is a huge difference in performance between the two heads. For someone wanting to just change heads on a 750 hp SCJ with no other mods to his engine, this would be a very worth while up grade.

Now, looking at fully ported casting to fully ported castings stepping up a valve size in both castings, there is going to be around a 50 to a 70 hp increase going to the P-51.s.

Keep in mind you may have a rule deal holding you to the SCJ casting. You can sell the SCJ's and recover most of the cost of the P-51's. It is a personal choice how much you want to spend to pick up 50-70 hp.

I have seen several 900-950 hp P-51 builds that are easy to duplicate. and also several easy to build 1000-1050 hp A head builds. People step up to the A head engines for 100 hp increase all the time and have to buy intake, pistons, headers, ect. for not much more power but a good bit more coin.

Its all a personal choice.  Also one could look at it in another aspect. They could be stepping up from a stock type head and are buying pistons and bypass the TFS Streets SCJ's and all the others and go straight to the Kasse's.

I don't understand why this is such a big deal............. it's all a progression to better heads for us. It hasn't been that long ago we didn't even have an aluminum head.

And running mid fives 50-70 hp is a little over a tenth of a second. 150 hp is worth less than 3 tenths. it takes a good bit of hp to go a little bit faster at that E.T.
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Re: P51 guys

Post  rmcomprandy on January 19th 2014, 5:53 pm

yellowhorse7 wrote:Sad to see that all everyone got out of this is a perception that P51's are weak. No one ever said that. In fact, the whole point of the discussion was ignored and really never answered. EXACTLY HOW MUCH BETTER, AND WHERE, ARE THEY BETTER THAN SCJ's. Blake and John are examples of people making them work. Yes they will pick up but not enough to substantiate an "upgrade".

Here is just one example ... You can't put a 1.650" diameter valve spring together with a .100" long intake valve, (to get any kind of extended installed spring height), on an SCJ and still use a roller rocker arm with a decent size fulcrum as the valve tip and stud get to close together.
A P-51 head ... NO problem.

There are a few other advantages ... most notably - casting thickness for further porting at important places.

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Re: P51 guys

Post  nitrous.f on January 19th 2014, 7:53 pm

personally I believe that blake and lem, know what there talking about! not saying other people are wrong , trust me I have the a429 aluminum heads that are ported to the max, and I know they can not touch the p51,s mid range or top end power! if I were to put my heads on blake motor n/a it would not perform the way those heads do! if anybody do not like there p51,s I will trade you my heads and pay the shipping both ways! Shocked 
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Re: P51 guys

Post  Lem Evans on January 19th 2014, 9:01 pm

cool40 wrote:Happy dyno ...

Chicken dinner served fresh off of a hot dyno.

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Re: P51 guys

Post  yellowhorse7 on January 19th 2014, 9:52 pm

nitrous.f wrote:personally I believe that blake and lem, know what there talking about! not saying other people are wrong , trust  me I have the a429 aluminum heads that are ported to the max, and I know they can not touch the p51,s mid range or top end power! if I were to put my heads on blake motor n/a it would not perform the way those heads do! if anybody do not like there p51,s I will trade you my heads and pay the shipping both ways! Shocked 

Then I guess there will another thread here soon about how and why my A429's out flow them
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Re: P51 guys

Post  dfree383 on January 19th 2014, 9:58 pm

yellowhorse7 wrote:
nitrous.f wrote:personally I believe that blake and lem, know what there talking about! not saying other people are wrong , trust  me I have the a429 aluminum heads that are ported to the max, and I know they can not touch the p51,s mid range or top end power! if I were to put my heads on blake motor n/a it would not perform the way those heads do! if anybody do not like there p51,s I will trade you my heads and pay the shipping both ways! Shocked 

Then I guess there will another thread here soon about how and why my A429's out flow them

You ever even own a set of p-51s
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Re: P51 guys

Post  yellowhorse7 on January 19th 2014, 9:59 pm

dfree383 wrote:
yellowhorse7 wrote:
nitrous.f wrote:personally I believe that blake and lem, know what there talking about! not saying other people are wrong , trust  me I have the a429 aluminum heads that are ported to the max, and I know they can not touch the p51,s mid range or top end power! if I were to put my heads on blake motor n/a it would not perform the way those heads do! if anybody do not like there p51,s I will trade you my heads and pay the shipping both ways! Shocked 

Then I guess there will another thread here soon about how and why my A429's out flow them

You ever even own a set of  p-51s

Own? No. Touch, observed in person, see PLENTY on a flow bench? Yes
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Re: P51 guys

Post  Larry T on January 19th 2014, 10:03 pm

my p51's have been in the upper 4's@3250lbs on radials with a 48 jet and on 28x10.5 slicks 5.0's several times.this is with the stock valves and with a victor 460 intake.at the moment upgrades are happening on the heads and if I can find the coin the tfs intake maxed out will happen also Wink 
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