406rwhp/390rwtq - PRC 2.5 heads/TR Cheater cam - stock manifolds/cats
10-09-2005, 10:26 PM
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406rwhp/390rwtq - PRC 2.5 heads/TR Cheater cam - stock manifolds/cats I just finished installing a set of PRC 2.5 heads on my '00 Trans Am. The install went real quick and I was very pleased with the results, especially going through the stock manifolds/cats!
A quick run down on the car's mods:
'00 Trans Am, 131k miles (stock shortblock), 6-speed
- Whisper lid
- TR ported TB
- ASP pulley
- LS6 intake
- Hooker catback
- Thunder Cheater cam (214/230 .601/.578 117 LSA)
- PRC 2.5 5.3l cylinder heads (11.0:1 compression ratio)
- stock manifolds/cats
- SPEC stage 3 clutch/steel flywheel
I re-baselined the car Friday night and put down 364rwhp/359rwtq. This is practically identical to what the car made last July when I installed the cam. The only thing changed was the addition of PRC stage 2.5 5.3l heads. This resulted in 406rwhp/390rwtq! This was exactly how I drive the car on the street- full exhaust, belts,etc. A gain of 42rwhp/31rwtq is incredible for $1500 outright, including new GM 5.3l castings!
I didn't have my LS1edit cable to tune the car, so I'll be re-dynoing the car later this week to make some air/fuel and timing adjustments. There is definitely a few hp/tq left in the tune. The tune in the car now is practically a stock tune, other than a 7k revlimiter.
Dyno graph - Before and after PRC stage 2.5 heads
I posted some pics and flow numbers on the heads a week or so ago. Here is the thread:
https://ls1tech.com/forums/generation-iii-internal-engine/384353-prc-2-5-heads-initial-impressions-flow-numbers-inside.html
I can't wait to get the longtubes on the car to see what they are going to be worth. I'm hoping around 20-25hp with them and the off-road y-pipe.
The car is a completely different animal now!
Big thanks to Jason@PRC for a killer set of heads. Also, thanks to John, Brad, and Natalie for help with the install.
A quick run down on the car's mods:
'00 Trans Am, 131k miles (stock shortblock), 6-speed
- Whisper lid
- TR ported TB
- ASP pulley
- LS6 intake
- Hooker catback
- Thunder Cheater cam (214/230 .601/.578 117 LSA)
- PRC 2.5 5.3l cylinder heads (11.0:1 compression ratio)
- stock manifolds/cats
- SPEC stage 3 clutch/steel flywheel
I re-baselined the car Friday night and put down 364rwhp/359rwtq. This is practically identical to what the car made last July when I installed the cam. The only thing changed was the addition of PRC stage 2.5 5.3l heads. This resulted in 406rwhp/390rwtq! This was exactly how I drive the car on the street- full exhaust, belts,etc. A gain of 42rwhp/31rwtq is incredible for $1500 outright, including new GM 5.3l castings!
I didn't have my LS1edit cable to tune the car, so I'll be re-dynoing the car later this week to make some air/fuel and timing adjustments. There is definitely a few hp/tq left in the tune. The tune in the car now is practically a stock tune, other than a 7k revlimiter.Dyno graph - Before and after PRC stage 2.5 heads
I posted some pics and flow numbers on the heads a week or so ago. Here is the thread:
https://ls1tech.com/forums/generation-iii-internal-engine/384353-prc-2-5-heads-initial-impressions-flow-numbers-inside.html
I can't wait to get the longtubes on the car to see what they are going to be worth. I'm hoping around 20-25hp with them and the off-road y-pipe.
The car is a completely different animal now!
Big thanks to Jason@PRC for a killer set of heads. Also, thanks to John, Brad, and Natalie for help with the install.
Last edited by Jason99T/A; 10-09-2005 at 11:52 PM.
10-09-2005, 10:29 PM
#2
Very nice power. No one will ever hear you coming either. Great stealth. Killer head gains.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
10-09-2005, 11:52 PM
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Thanks Patrick! The heads worked out even better than I thought! I wish I could have used a Cometic .045" gasket, but Thunder was out of stock of them for this weekend. I'll install those when I go through the shortblock around Christmas time. I ended up using the GM MLS gaskets. A few of the cylinders had 30% leakdown!
Jason
Jason
10-09-2005, 11:58 PM
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Nice numbers Jason
I guess I was right in my prediction that you'd have heads on "the car you weren't going to mod" in less than a year.
Time for headers and a Fast 90 
I guess I was right in my prediction that you'd have heads on "the car you weren't going to mod" in less than a year.
Time for headers and a Fast 90 
10-10-2005, 09:30 AM
#6
Great results Jason! I thought you'd be really happy with them 
Nice leakdowns man, that's one whored-out shortblock! LOL
Nice leakdowns man, that's one whored-out shortblock! LOL
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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
Jason
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
10-10-2005, 10:39 AM
#7
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Hey Jason,
Can you comment how how this car feels now?
I have been thinking long and hard about putting a set of afr 205s on my completely stock '03Z06. I have seen some killer results and like the idea of keeping a completely stock exhaust system. I am thinking this combo will not make so much low end torque to overwhealm the tires down low, but be an animal up top. A few have posted dyno results in the 410 RWHP area on Z06s bolt ons/ stock cam/ stock manifolds & exhaust).
Thanks,
-Nick
Can you comment how how this car feels now?
I have been thinking long and hard about putting a set of afr 205s on my completely stock '03Z06. I have seen some killer results and like the idea of keeping a completely stock exhaust system. I am thinking this combo will not make so much low end torque to overwhealm the tires down low, but be an animal up top. A few have posted dyno results in the 410 RWHP area on Z06s bolt ons/ stock cam/ stock manifolds & exhaust).
Thanks,
-Nick
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10-10-2005, 10:52 AM
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Thanks guys! The shortblock has definitely seen better days! I can't complain though as it is still making respectable power. I would have rebuilt it this weekend, but just didn't have the time.
Blake, you know me too well... I can't leave anything alone.
Nick, the car is a completely different now - way more power with 0 loss in driveability! Throttle reponse in all gears is much better and the car just pulls like crazy now. Traction in 1st and 2nd is non-existant. Before the heads, the car would just haze the tires in 1st and hook in 2nd. Time for some Nittos.
Jason
Blake, you know me too well... I can't leave anything alone.
Nick, the car is a completely different now - way more power with 0 loss in driveability! Throttle reponse in all gears is much better and the car just pulls like crazy now. Traction in 1st and 2nd is non-existant. Before the heads, the car would just haze the tires in 1st and hook in 2nd. Time for some Nittos.
Jason
10-10-2005, 04:54 PM
#10
No problem Jason, glad I could help out with the swap. Those are some awesome numbers for that setup. I am really interested to see what kind of gains we can get out of it after you put your tune into it. By the way you owe me a drive in the car
John
John
10-10-2005, 07:52 PM
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No problem John! You can drive it anytime you want. Thanks again for the help this weekend. I hope to tune the car Thursday night if all works out, and maybe put the headers on this weekend???
Jason
I hope to tune the car Thursday night if all works out, and maybe put the headers on this weekend??? Jason
10-10-2005, 10:20 PM
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No TRak came for me! I'll be sticking with the current cam for a good while. You can't beat it in terms of power and driveability. I'm really amazed at the power it is making given its size @.050". Lobe area is a good thing!
Jason
Jason
Last edited by Jason99T/A; 10-11-2005 at 12:14 AM.
10-10-2005, 11:17 PM
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Originally Posted by Patrick G
Headers next...hmmm...so how long 'til the TRak cam goes in, LOL.
Be sure and save your exhaust manifolds and cats because you may miss the stealthy sound after you've run headers for a while.
Be sure and save your exhaust manifolds and cats because you may miss the stealthy sound after you've run headers for a while.
Don't believe that "I like the stealthy sound" BS for a second. In 2 months that car will have 16" header extensions and a roll cage in it. This car is taking the same track as his daily driver Honda Accord did
10-11-2005, 06:28 PM
#15
Lmao!
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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
Jason
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
10-12-2005, 01:32 AM
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Originally Posted by SMOKIN01TA
you biotch, you were supposed to call me when you did them heads and tell me the results 
nice, you ready for another install
nice, you ready for another install
I have some news you might like to hear. Check your PMs!Jason
10-12-2005, 02:43 AM
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I'm confused. Patrick made 11 less HP than you did Jason but he had AFR heads, a tune and I would hope less leakage past the rings. Doesn't make sense to me. Am I missing something?
10-12-2005, 08:26 AM
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Originally Posted by BuckWheat1
I'm confused. Patrick made 11 less HP than you did Jason but he had AFR heads, a tune and I would hope less leakage past the rings. Doesn't make sense to me. Am I missing something?
