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Old 03-19-2012, 11:11 AM   #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, 01:03 PM   #2
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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!!

Same valve sizes as the smaller version? What is the MCSA of both versions?
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Old 03-19-2012, 04:54 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, 06:06 PM   #4
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Hell yeah
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Old 03-20-2012, 10:06 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, 11:44 AM   #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, 12:33 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, 01:46 PM   #8
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Originally Posted by ULTRAZLS1 View Post
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, 09:17 AM   #9
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Bump for unanswered questions...
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Old 03-22-2012, 10:40 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, 12:52 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, 01:07 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, 01:25 PM   #13
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Originally Posted by MA2010SS View Post
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, 02:43 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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