ALL New PRC Stage 2.5 5.3L Head Results!!!!
11-06-2006, 03:01 PM
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ALL New PRC Stage 2.5 5.3L Head Results!!!! We finished the installed on the new PRC Stage 2.5 5.3L heads on John's car here at Texas Speed. The specs on the heads are as follows:
2.02 SS intake valves
1.57 SS exhaust valves
PRC Dual Spring Kit w/ Titanium Retainers
CNC 63cc Combustion Chambers
220cc Intake runner volume
Heads came off the CNC machine, onto the Newen CNC seat and guide machine for the valve job, onto the flow bench and then bolted onto the car. These were NOT a "prepped" set of heads, no extra hand finishing, no milling.
The car specs are as follows:
2000 Camaro SS
10k mile LS1 shortblock
LS6 Intake Manifold
Lid
Powerbond Pulley
Magic Stick 3 cam
QTP 1 7/8 Long Tubes
Texas Speed Rumbler X System
Below is an overlay of before and after the head swap. Only things that changed here are the heads. The dyno is having issues reading torque, so that is the reason the graph reads to 1500, we are working on getting this lined out. This week we will have new results using a FAST90/PTM90 and the graph should have torque. Let us know what you guys think!!!
That is a gain of 62rwhp!!
2.02 SS intake valves
1.57 SS exhaust valves
PRC Dual Spring Kit w/ Titanium Retainers
CNC 63cc Combustion Chambers
220cc Intake runner volume
Heads came off the CNC machine, onto the Newen CNC seat and guide machine for the valve job, onto the flow bench and then bolted onto the car. These were NOT a "prepped" set of heads, no extra hand finishing, no milling.
The car specs are as follows:
2000 Camaro SS
10k mile LS1 shortblock
LS6 Intake Manifold
Lid
Powerbond Pulley
Magic Stick 3 cam
QTP 1 7/8 Long Tubes
Texas Speed Rumbler X System
Below is an overlay of before and after the head swap. Only things that changed here are the heads. The dyno is having issues reading torque, so that is the reason the graph reads to 1500, we are working on getting this lined out. This week we will have new results using a FAST90/PTM90 and the graph should have torque. Let us know what you guys think!!!
That is a gain of 62rwhp!!
11-06-2006, 04:30 PM
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Hot damn! Flycut and mill those puppies! Should be even more power left in em. Those are damn good numbers. Can you scale the graph down though to just read up to 500hp so we can see the graph more clearly?
Nate
Nate
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11-06-2006, 04:41 PM
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I can't since the tach reading was off and couldnt get an accurate torque reading. We will have a better idea when we throw the fast 90 on and re-dyno.
11-07-2006, 03:11 AM
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Damn !!! impressive results TSP guys & yes PRC getting better and better woow Can't wait for 90/90 setup though 
What is the main reason of using 1 7/8" instead of 1 3/4" , Zach ?
peace
What is the main reason of using 1 7/8" instead of 1 3/4" , Zach ?
peace
11-07-2006, 05:25 AM
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Damn man! Great numbers. You guys really want me to pull the trigger on some heads and put myself in the doghouse with the wife dont ya? Decisions decisions 
Nate
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11-07-2006, 08:51 AM
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Originally Posted by Zach@Texas-Speed
The good ole' Magic Stick 3
How well would these work with the good ole' Torquer V3 with an LS6 intake?
.....or should I call ya?
R/
Frat
11-07-2006, 09:28 AM
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Originally Posted by Fratsit
I am kicking tires on heads....
How well would these work with the good ole' Torquer V3 with an LS6 intake?
.....or should I call ya?
R/
Frat
How well would these work with the good ole' Torquer V3 with an LS6 intake?
.....or should I call ya?
R/
Frat
11-07-2006, 09:33 AM
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Originally Posted by motorbuilt
Price on the 2.5's?
11-07-2006, 11:23 AM
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Isnt his first dyno numbers low with that cam and those mods??
I would have thought it would have been well over 400 RWHP...am I wrong?
Thanks Zach
Erik
I would have thought it would have been well over 400 RWHP...am I wrong?
Thanks Zach
Erik
Last edited by erikthegoalie; 11-07-2006 at 11:31 AM.