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Generation III Internal Engine 1997-2006 LS1 | LS6
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Old Aug 11, 2008 | 11:12 PM
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Default ported stock heads
Just wondering how much you guys think can be gained from a stage 2 port on the stock heads on a 99z28
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Old Aug 12, 2008 | 07:52 AM
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what exactly is a stage 2 port job?...
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Old Aug 12, 2008 | 08:02 AM
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Depends on who does the port job and what castings they are.

Anywhere from lose power to 40 hp+++
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Old Aug 12, 2008 | 10:51 AM
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+1 might want to look into just getting some 243s and do a little bit of touch up on them . stage x port jobs are different from various folks as well as various results .
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Old Aug 12, 2008 | 11:27 AM
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well the guy does really good port work and he charging 400 bucks for the whole thing so I was just wondering what kind of gains I would see if its worth the 400 bucks
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Old Aug 13, 2008 | 09:17 AM
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from past posts its my understanding stock ls1 heads flow about 235 cfm, stock ls6 about 265 cfm. ported ls1 between 280- 300 max where as ls6 w stage 2 320 plus. i have budget ls6 stage 1 which TSP claims flows 307 cfm i didnt think i needed more than that. (i paid $900.)
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Old Aug 13, 2008 | 10:46 AM
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Default misinformation
Originally Posted by DANOZ28
from past posts its my understanding stock ls1 heads flow about 235 cfm, stock ls6 about 265 cfm. ported ls1 between 280- 300 max where as ls6 w stage 2 320 plus. i have budget ls6 stage 1 which TSP claims flows 307 cfm i didnt think i needed more than that. (i paid $900.)
wrong ls1=227
ls6=250
5.3 4.8=221
6liter 317=245

all at .600 on the intake and all flow close to the same on the exhaust..

you will see nice gains if material was taken from the right places in the runners....i say go for it..
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Old Aug 13, 2008 | 11:15 AM
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We offer cnc porting of our customers castings for $600 with valve job & decking! For a budget setup that's a good option, but really the PRC ls6 heads are outright for just over $1000. When you consider your getting proven performers with new castings it's pretty hard to beat! Besides you can then ebay your stock heads for 100 bux or so & be in a set of good quality proven heads for under $1000!!

http://www.texas-speed.com/shop/item...d=649&catid=20
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Old Aug 14, 2008 | 04:59 AM
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Not meaning ot hijack but do you port 241s too Jason?
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Old Aug 14, 2008 | 05:04 AM
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Originally Posted by 5_02ls1
wrong ls1=227
ls6=250
5.3 4.8=221
6liter 317=245

all at .600 on the intake and all flow close to the same on the exhaust..

you will see nice gains if material was taken from the right places in the runners....i say go for it..
Are you talking as cast or P&P'd?
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Old Aug 14, 2008 | 09:50 AM
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Shawn, we do port 241 castings. We can run our same 220cc 5.3L program on the 241 castings.

ZMONSTER!: He is refering to factory castings.
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Old Aug 14, 2008 | 12:30 PM
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5 02LS1 WOW I WAS WAY WRONG, i'm sure you have a flow bench you've tested these yourself. please provide proof!
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Old Aug 14, 2008 | 11:10 PM
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Originally Posted by 5_02ls1
wrong ls1=227
ls6=250
5.3 4.8=221
6liter 317=245

all at .600 on the intake and all flow close to the same on the exhaust..

you will see nice gains if material was taken from the right places in the runners....i say go for it..
x2
i have Ported stage 3 heads, ect in sig better
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