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Old 03-19-2012, 12:11 PM   #1
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Highest Flowing LS3 Cylinder Head Available

We're finalizing the new 263cc version of the PRC LS3 aftermarket casting cylinder heads right now guys! The good news is 380cfm with a runner that is the same size as stock & better than stock valve drop! Look for heads cam power numbers to never be the same very very soon!!

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Old 03-19-2012, 02:03 PM   #2
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We're finalizing the new 263cc version of the PRC LS3 aftermarket casting cylinder heads right now guys! The good news is 380cfm with a runner that is the same size as stock & better than stock valve drop! Look for heads cam power numbers to never be the same very very soon!!

Same valve sizes as the smaller version? What is the MCSA of both versions?
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Old 03-19-2012, 05:54 PM   #3
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That number sounds great, especially if it was at a realistic lift # like .650".
I'm assuming this is a CNC package for that casting?
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Old 03-19-2012, 07:06 PM   #4
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Old 03-20-2012, 11:06 AM   #5
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Quote:
Originally Posted by Jason 98 TA View Post
We're finalizing the new 263cc version of the PRC LS3 aftermarket casting cylinder heads right now guys! The good news is 380cfm with a runner that is the same size as stock & better than stock valve drop! Look for heads cam power numbers to never be the same very very soon!!


So what was the point of me buying the 250cc versions?

You advertised the 250cc runner to be an advantage due to added velocity...then make a stock size runner casting and claim it to be the best ever?

I am confused...
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Old 03-20-2012, 12:44 PM   #6
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Is there an option for smaller combustion chambers to up the compression like your other cylinder heads?

Edit: Also, are these the heads that you were working on that would accept an LS7 intake manifold?
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Old 03-20-2012, 01:33 PM   #7
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Jason,

I did just purchase my TSP 229/236 camshaft and will be having it installed within the next 2 weeks, so if you need a test dummy....I can be that guy.

Looking forward to seeing the dyno results of these heads.
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Old 03-20-2012, 02:46 PM   #8
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So what was the point of me buying the 250cc versions?

You advertised the 250cc runner to be an advantage due to added velocity...then make a stock size runner casting and claim it to be the best ever?

I am confused...
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Old 03-22-2012, 10:17 AM   #9
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Bump for unanswered questions...
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Old 03-22-2012, 11:40 AM   #10
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No offense to anyone,

But you guys all must play with yourselves
you got guys with 800 + horsepower before these heads even came out.
They're blowing axles and drivesshafts and clutches trying to get thier car to hook up...

i mean how much horsepower do you really need? all the horsepower and torque in the world wont make you the fastest without the right drivetrain to back it up. and even with the right drivetrain there always too much horsepower and torque around for it to handle.
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Old 03-22-2012, 01:52 PM   #11
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No offense to anyone,

But you guys all must play with yourselves
you got guys with 800 + horsepower before these heads even came out.
They're blowing axles and drivesshafts and clutches trying to get thier car to hook up...

i mean how much horsepower do you really need? all the horsepower and torque in the world wont make you the fastest without the right drivetrain to back it up. and even with the right drivetrain there always too much horsepower and torque around for it to handle.
Because there are only so many ways to increase power on a naturally aspirated setup?
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Old 03-22-2012, 02:07 PM   #12
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I'll try to keep this answer simple, it all depends on your camshaft, if the heads flow 380CFM at what point are they providing the best flow numbers .700 lift??? A lesser flow numbers say 340CFM head work excellent with a .600 lift. If you have that same .600 lift cam working with the 380CFM head, the heads will outflow the cam. It will come down to the best combo of heads/cam.

Hope this helps
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Old 03-22-2012, 02:25 PM   #13
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Quote:
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I'll try to keep this answer simple, it all depends on your camshaft, if the heads flow 380CFM at what point are they providing the best flow numbers .700 lift??? A lesser flow numbers say 340CFM head work excellent with a .600 lift. If you have that same .600 lift cam working with the 380CFM head, the heads will outflow the cam. It will come down to the best combo of heads/cam.

Hope this helps
Very true, and keep in mind it isn't always about the flow numbers. Valve angle, port velocity, etc also factor in...I will say that it isn't necessarily a bad thing that heads can outflow the cam either- just don't be looking for the holy grail and upgrading every time a set of heads with 5 more cfm come out.
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Old 03-22-2012, 03:43 PM   #14
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Very true, and keep in mind it isn't always about the flow numbers. Valve angle, port velocity, etc also factor in...I will say that it isn't necessarily a bad thing that heads can outflow the cam either- just don't be looking for the holy grail and upgrading every time a set of heads with 5 more cfm come out.

Right on, it's always about the combo that is put together and what the end goals are...mild, full race...etc

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Old 03-22-2012, 04:12 PM   #15
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Quote:
Originally Posted by Kyle2k View Post
Very true, and keep in mind it isn't always about the flow numbers. Valve angle, port velocity, etc also factor in...I will say that it isn't necessarily a bad thing that heads can outflow the cam either- just don't be looking for the holy grail and upgrading every time a set of heads with 5 more cfm come out.

very true, that was kinda my point i hate when people brag about flow numbers. if you have ever had a head on a flow bench and stuck a pencil in the corner of the intake runner and watch the flow numbers increase you'd understand that it isnt always how much it flows but how it flows.
have you ever seen the epoxy trick on race heads ? they put a little fin of epoxy by the valve stem in the intake runner to twist the airflow as it enters the cylinder. flow numbers matter but how the air flows into the cylinder matters more.
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Old 03-23-2012, 09:40 AM   #16
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Guys the easy way for me to explain is we offer lots of different options to meet each individual goal. The larger runner of course moves more air. In many applications a smaller runner helps to really wake up a car with such a large runner from the factory. What we have now added is a runner the same size as stock that moves in the area of 380cfm. That is something that completely dominates any ported stock casting (which typically is over 270cc)

In a all out application the larger runner will be a pretty sweet option. Both heads offer better p/v, altered valve locations & angles, smaller chambers, thicker decks, etc.

Later on we will over a 270+cc runner that goes near 400cfm for large stroker engines. We offer nearly 20 different LS cylinder heads currently. That doesn't mean 20 times we made something to replace the last part, it means we're building cylinder heads to meet goals of different applications.

I hope to test the 250cc next to the new runner side by side on our engine dyno on a 231/236 cam'd stock bottom end shorty to let you guys know the results.
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Old 03-23-2012, 09:43 AM   #17
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That's not 1000% correct. Time & time again a head that doesn't back up as early on a flow bench typcially makes additional power. In other words if you have two ports that move 350cfm & one will go larger lifts without backing up it typically makes more power than the head that backs up right after your camshafts max lift. Thats one of the great things about a aftermarket casting with altered valve configurations. you can solve some of the problems with porting a stock casting.
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I'll try to keep this answer simple, it all depends on your camshaft, if the heads flow 380CFM at what point are they providing the best flow numbers .700 lift??? A lesser flow numbers say 340CFM head work excellent with a .600 lift. If you have that same .600 lift cam working with the 380CFM head, the heads will outflow the cam. It will come down to the best combo of heads/cam.

Hope this helps
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Old 03-23-2012, 10:06 AM   #18
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I understand that it's not 100% correct, there are a lot of other variables that will go into someone making a decision on what head to go with. Someone was confused and I gave a brief quick explanation. My point was bolting on the higher flowing cylinder head with a smaller cam will not take advantage of the extra flow that the head offers if the 380CFM is at say .725 lift, what are the flow numbers at .625 lift 320CFM??? Whereas the head that flows 340CFM at .625 lift might be the better choice to someone that does not have the larger cam...not trying to confuse anyone, just trying to keep it simple

Good to know that you guys have made a bunch of different heads to meet different needs
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Old 03-23-2012, 11:06 AM   #19
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The head that most closely matches the CFM demand of the shortblock will usually have the best power curve. CFM with the intake manifold attached would be a better gauge of performance, but still CFM is only one part of the puzzle. Which is why I asked for information on the cross section in my earlier post. Which wasnt answered.
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Old 03-26-2012, 08:33 AM   #20
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Quote:
Originally Posted by Jason 98 TA View Post
We're finalizing the new 263cc version of the PRC LS3 aftermarket casting cylinder heads right now guys! The good news is 380cfm with a runner that is the same size as stock & better than stock valve drop! Look for heads cam power numbers to never be the same very very soon!!


Jason Which company are you from? maybe i'm an idiot and just cant find you in the sponsor area . Do you sell these heads or port them? i'm interested in getting a price for a set of heads before i do my cam install. pm me please
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Old 03-26-2012, 05:49 PM   #21
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Any idea when these heads go on sale and will they be priced similar to the 250cc?
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Old 03-26-2012, 06:34 PM   #22
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Jason Which company are you from? maybe i'm an idiot and just cant find you in the sponsor area . Do you sell these heads or port them? i'm interested in getting a price for a set of heads before i do my cam install. pm me please
He works at Texas Speed and Performance.
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Old 03-26-2012, 06:50 PM   #23
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ok i simple terms what kind of gains would a set of heads make with stock cam and what kind of gains with a cam and heads
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Old 03-26-2012, 08:54 PM   #24
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He works at Texas Speed and Performance.
thanks
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Old 03-26-2012, 11:41 PM   #25
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ok i simple terms what kind of gains would a set of heads make with stock cam and what kind of gains with a cam and heads
Stock heads with stock cam=waste of time. The few tests I have seen show maybe 10-15 hp on an engine dyno. Doing just heads without doing a cam while your at it would be ludicrous IMO.

I am sure he will reply...but I want to say they are seeing about a 40hp increase adding these heads to their 231/236 cam. I believe they also state 25 hp from their ported stock castings on top of the 231/236.

231/236 cam plus these new castings and all supporting bolt ons should see around 500rwhp. If a bolt on LS3 makes about 420rwhp on average that would be an ~80rwhp gain from cam and heads.

Just my .02
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