Dynamometer Results & Comparisons - PRC As Cast Heads Dyno Results on 01 Z06

We just finished dyno testing a production version of the PRC As Cast Cathedral LS cylinder heads & I'm completely pumped up about the results!

The test car is a 01 z06 cam only car with the following mods:

Z06 LS6
243 Heads
Tsunami Camshaft
PRC Spring Kit
TSP Headers & X Pipe
Stock Mufflers
Vararam intake

The only addition was a set of PRC As Cast Cathedral Heads. The car gained right at 30hp & 24lb ft of torque! That's a awesome gain over a LS6 head, keep in mind that'd probably be 45-50 over a stock LS1 241 casting!

The first production run of these heads are expected to be ready less than a month so keep your eyes open for new results very soon!

https://www.texas-speed.com/images/media/as%20cast%20dyno.jpg

http://www.texas-speed.com/images/product/large/3515_1_.jpg

http://www.texas-speed.com/images/product/large/3515_2_.jpg

http://www.texas-speed.com/images/product/large/3515_3_.jpg

Nice results!

Been following your thread in the Internal Engine section. Can't wait for these to come out. Any idea on pricing yet?

Nice numbers!

You should get some track results too

How do they compare flow wise to the 237's?
How big is the valve?

Good results.
In for specs and pricing:corn:

Same as above...

Any plans on CNC'd versions?

Dear TSP , you gotta go for a small bore LS3/LS7 heads for the LS1/LS6's "3.905" bore. I would be the first one who buys them! with a small bore cnc'd LS3's, I think they will flow up to 350-370cfm which with pull up 60-80rwhp over the LS1 heads.
so a H/C ls1 with cnc ls3 heads could reach 500rwhp easily

Look at mast's small bore version heads. They don't flow that much at all. The small bore version flow something like 270 cfm or something, I know its below 300

I've heard of them by a friend ...
and as you know , the Mast's are pretty expensive (not worth it) , even more expensive than the TFS's .... while the TFS's , PRC's , AFR's have a much higher flow ....

Dear TSP , you gotta go for a small bore LS3/LS7 heads for the LS1/LS6's "3.905" bore. I would be the first one who buys them! with a small bore cnc'd LS3's, I think they will flow up to 350-370cfm which with pull up 60-80rwhp over the LS1 heads.
so a H/C ls1 with cnc ls3 heads could reach 500rwhp easily

How did you figure 60-80rwhp over LS1 heads???

TFS 215s would outperform small bore LS3/LS7 heads on a 346ci.

We just finished dyno testing a production version of the PRC As Cast Cathedral LS cylinder heads & I'm completely pumped up about the results!

The test car is a 01 z06 cam only car with the following mods:

Z06 LS6
243 Heads
Tsunami Camshaft
PRC Spring Kit
TSP Headers & X Pipe
Stock Mufflers
Vararam intake

The only addition was a set of PRC As Cast Cathedral Heads. The car gained right at 30hp & 24lb ft of torque! That's a awesome gain over a LS6 head, keep in mind that'd probably be 45-50 over a stock LS1 241 casting!

The first production run of these heads are expected to be ready less than a month so keep your eyes open for new results very soon!

Any Flow numbers?

Are these stock casting or aftermarket castings?

Ummmmm....just going out on a limb here but I have to guess aftermarket being that they are cathedral port and out perform the ls6 style heads by 30 hp.

They are most certainly aftermarket castings. Check out the thread in the Internal Engine section. Can't remember if Texas Speed posted flow numbers in that thread or not.

Another great product from TSP.
Great work I'm sure I'll be buying a set very soon to test :D

Nobody has built a ls3 port on a small bore because they cathedral heads we offer now will dominate a LS3 intake port setup IMHO.

This is a complete aftermarket casting head with the ports cast similar to our cnc versions. :) :)

Nobody has built a ls3 port on a small bore because they cathedral heads we offer now will dominate a LS3 intake port setup IMHO.

This is a complete aftermarket casting head with the ports cast similar to our cnc versions. :) :)

FWIW:

http://www.mastmotorsports.com/2010/product-view.php?cat=Cylinder%20Heads%20-%20Assembled&id=360

Jason,

That is very impressive!! But, i know you will have the haters say, thats BS because PRC heads are subpar and only good for budget and that the most expensive heads are the only way to go!!

That is a simple and easy setup!! Good stuff TSP!!

Lets see those heads with a MS3!!

Nice, I want a pair.

Nice Job Guys! PRC is stepping up their game! I imagine this head will compete with the tfs 220 as cast head? Yet for possibly less coin?
And BTW the MAST small bore heads flow over 350cfm and are killer heads, port design is much More important than port size imo

Nice Job Guys! PRC is stepping up their game! I imagine this head will compete with the tfs 220 as cast head? Yet for possibly less coin?
And BTW the MAST small bore heads flow over 350cfm and are killer heads, port design is much More important than port size imo

Try more coin. Already asked that in the other thread they've got going on. They are going to be priced higher than the TFS 220 heads, but they claim the new PRC heads will out perform the TFS heads. Bad call in my honest opinion. Why pay more when you can get a proven performer in the TFS 220 heads? They should make the price equal to or even less than the TFS heads. I'd like to see some side by side comparissions once all is said and done.

^Damn didnt realize that. Bad move indeed..

Don't the trick flow heads require aftermarket rockers or am I mistaken?

We will be pricing these heads to match the TFS 220 as cast and our heads will not require aftermarket rockers. So in the end they will still be much cheaper with better performance. Its unfortunate you guys are already bagging on this awesome head before official pricing has even been released. This head is on my car and I can tell you they made a huge difference. I am extremely happy with the power the car made as well as the seat of the pants feel from putting the heads on.

I am still excited about them. I can't wait to see more. A set of these could be in my future but not for a while.

Nice to see another viable "As Cast" option out there. My advise would be to price them under what the TFS "As Cast" heads sell for and you will for sure have a great selling head.
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01-23-2012, 10:14 AM #27
Jason 98 TA
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I do not plan on selling lower than the TFS cylinder head. The PRC head will come with a double PRC spring, cnc machined chambers, & guides. As well as 320cfm capability!Nobodies as cast is even in the same ballpark right now!
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Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com



Above is something taken directly out of the other thread about these heads in the Gen III internal engine section. Not bashing on them at all. I just think it would be a smart business move to price them at, or below, what the TFS 220 heads sell for. If these new heads truly are that much better, then I can understand that you would price them higher. I just think you'll get more orders if they are of equal price, or cheaper, than the TFS 220 heads. Remember, the TFS 220 head are proven performers and some won't want to take a chance on the PRC heads, especially if they are more money.

I just stated that we will be matching the TFS heads price. We will not have a lower price, especially considering the amount of time and work we have into these. Once these get out you WILL see a performance difference between the two. I feel that this test lends some proof to that. Remember this car still has an LS6 intake and 1 3/4 headers on it, there is still some potential for more power. IMO, and obviously I am slightly biased, PRC has proven itself over and over. Our heads continue to be at the top of the list when put in magazine articles and contests, as well as putting a car well into the 9's on a stock bottom end. PRC has been proven to not be a risk.

I just stated that we will be matching the TFS heads price. We will not have a lower price, especially considering the amount of time and work we have into these. Once these get out you WILL see a performance difference between the two. I feel that this test lends some proof to that. Remember this car still has an LS6 intake and 1 3/4 headers on it, there is still some potential for more power. IMO, and obviously I am slightly biased, PRC has proven itself over and over. Our heads continue to be at the top of the list when put in magazine articles and contests, as well as putting a car well into the 9's on a stock bottom end. PRC has been proven to not be a risk.


I agree with you Jon that the PRC heads, specifically the PRC 215 and 227, have shown to be top of the line heads that are right there with AFR and TFS. I don't have any doubts that the PRC as cast heads will be great and this recent dyno test shows their potential. I'm very sure that once these hit production and more dyno/track results pop up on here, they will be a great selling head, giving us budget minded guys another option. Do you guys plan on doing any back to back testing with the TFS 220 as cast heads? I also like the fact that they will come with .650 lift springs. I don't know why AFR doesn't do that.

This is a complete aftermarket casting head with the ports cast similar to our cnc versions. :) :)



Which CNC Version? The 227 or the 237?

Not sure if you missed it earlier, but I was wondering how the flow of these compared to the 237.

Also wondering what size valve is in it.

I've been waiting since i heard it was coming out and I got my money waiting.

The results are nice BUT... with me and my friends building our cars,we never seem to get the same results the people get who build and dyno their own product. This has been our case with lg,thunder and speed inc. If some one else bought the product,went to a dyno in their own town and got the same,then i would say hell yeah. Not saying your product isn't good,this is just what has always happened with us all here. Then if you tell someone your numbers are inflated,they cry about it. Now on a out of the box AFR 205 head on my car,i gained 47hp back when i had a ls1 over a stock ported head. I also gained 4 tenths off that lil head alone. I see people saying the prc heads are just as good as the AFR or TFS head....if thats true then you guys done one hell of a job there.

Which CNC Version? The 227 or the 237?

Not sure if you missed it earlier, but I was wondering how the flow of these compared to the 237.

Also wondering what size valve is in it.





Still wondering...


:read:

These heads flow a little less then the 227s if I remember correctly. It has a 2.06 intake valve and a 1.60 exhaust valve. The 237s are meant for larger cube motors and move considerably more air then these do.

For what its worth, we did the install in my buddy's garage on jack stands and using a regular floor jack. Too many cars in the back for me to get my car on the lift at this time of year.

Any idea when they will be ready for production?

Excellent, I know as a builder I'm always excited for a new product, the thing most don't realize is a properly designed cast head will perform just as well as cnc'd the engine doesn't know what the surface finish is inside the ports, shiny things sell that's the way it will always be lol aka Dart 205-225229cc heads, valve job and some minor tweaking produces good hp for the money vs a 2500$+ cnc version
ever get a little shadowing after running a head on the cnc because of core shift or whatever, we sand those areas on heads we'd sell just so people wouldn't whine, trust me it makes no difference in power
So a

Definitely interested in these heads... looking forward to seeing more results.

We will be looking to put these into production in the next month or two. We are in the final phases of testing now.

what size ports are on these heads?

Trickflow's dont require Aftermarket rockers either, just get the TEA spring package and grind down the stock rocker stands. install the comp trunion upgraded stockers and your good to GO!

BTW Texas Speed my offer still stands, back to back 1/4mile track comparisons for your PRC LS1 AS cast heads vs my Trickflow LS1 220 As Cast heads. Car is a full track car 82' Gbody with a stock bottom end LQ9, Powerglide. Only changes would be heads and fueling both setup to 12.8:1-13.0:1 AFR @ WOT on the wideband of course.

How would these compare to your 215 head? HP Gains seem very similar between the two. Looks like 10-15hp over the 2.5 ls6 heads.

06x6,

Id be more interested in a side by side same day engine dyno & flow bench comparison. Would you be interested in that?

As far as comparing to the 215s I guess it all depends on the combo.

I really like the PRC 227 heads, they are without a doubt the best 3.9" bore heads available. the as cast was based off that head so while it doesn't move the air the 227 head does, it still performs awesome & I'd put it against any other LS head on a 3.9" bore no problem.

As far as comparing to the 215s I guess it all depends on the combo.

I really like the PRC 227 heads, they are without a doubt the best 3.9" bore heads available. the as cast was based off that head so while it doesn't move the air the 227 head does, it still performs awesome & I'd put it against any other LS head on a 3.9" bore no problem.


Jason,

You guys just need to do a dyno with the TFS 215 vs. your PRC 215/227. I have no doubt that your PRC will stack up to the TFS. You guys def have came along way. People are still stuck in this illusion that PRC is just a budget head.

I would just post up the charts, screw everybody else feelings..

06x6,

Id be more interested in a side by side same day engine dyno & flow bench comparison. Would you be interested in that?

Sure, let me know how I can help. I figured Track Results with simple wideband tuning would speak alot for the general crowd. Can do Chassis dyno results at some point too.

:usa:

Sure, let me know how I can help. I figured Track Results with simple wideband tuning would speak alot for the general crowd. Can do Chassis dyno results at some point too.

:usa:

06X6,

That would be sweet man if you and Jason could ever get that arranged. :nod:

Updates?

Trickflow's dont require Aftermarket rockers either, just get the TEA spring package and grind down the stock rocker stands. install the comp trunion upgraded stockers and your good to GO!

BTW Texas Speed my offer still stands, back to back 1/4mile track comparisons for your PRC LS1 AS cast heads vs my Trickflow LS1 220 As Cast heads. Car is a full track car 82' Gbody with a stock bottom end LQ9, Powerglide. Only changes would be heads and fueling both setup to 12.8:1-13.0:1 AFR @ WOT on the wideband of course.

you're using 2 entirely different cars with different trannies.

All variables should be the same including the car/drivetrain/tire with the only difference being the heads.

I don't seem to understand why so many people want compared to brand X
heads as controlling all the variables becomes very difficult. From the pics
and now results provided it appears to me that TSP has poured their heart
and soul into a cost consious design for the 3.9" bore AS CAST market.
No more or no less.....I mean 30 horse over the LS6 243 casting with about
6 more cc of intake volume, that is very impressive !!! Port speed, air velocity
and throttle response will be tremendous.....Great job.....:hail:

nice head for the price.how well do the ports line up with a fast intake ?

Haven't seen anything on these in a while. Anyone running them yet?