Ported LS3/L92 heads, What kind of results should I expect?
12-05-2009, 01:23 PM
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Ported LS3/L92 heads, What kind of results should I expect? Just wanted to hear from those who have work done to their LS3 heads and what kind of results are you seeing? I have seen some reports LS3's with H/C work pushing over 530rhwp.
If you have please post the following;
Who did the work
Flow rate, intake and exhaust
Milling
Valve job
CNC
Stock or Stroked Motor
RWHP & RWTQ
Thanks for the help!
If you have please post the following;
Who did the work
Flow rate, intake and exhaust
Milling
Valve job
CNC
Stock or Stroked Motor
RWHP & RWTQ
Thanks for the help!
lol im sure companies like prc and wcch wouldnt touch them if there was no gain to have from porting them
12-16-2009, 06:47 PM
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Well they are all showing that they are making around 25 to 30 on CNC LS3 heads, but I wonder how much is that the porting or is it the valve job and milling the heads for more CR is the reason they have so much gain. All the major shops are telling me that LS3 heads flow so good that it is a waist to port the intakes. However they do recomend porting the exhaust and valve jobs.
12-16-2009, 07:37 PM
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Well they are all showing that they are making around 25 to 30 on CNC LS3 heads, but I wonder how much is that the porting or is it the valve job and milling the heads for more CR is the reason they have so much gain. All the major shops are telling me that LS3 heads flow so good that it is a waist to port the intakes. However they do recomend porting the exhaust and valve jobs.
it depends on what the engine needs as far as airflow..if it's a mild build,smaller cubes then you probably won't see a lot of gains from porting, because the heads are flowing more than enough air to feed the engine..
but up the cubes,compression,etc. then the airflow needs to increase to feed what the engine demands..not to mention on bigger cube deals the OEM intake becomes a limiting factor at higher rpm,no matter how good the heads flow..
and FWIW,the proper VJ is a major factor in airflow,as well as the shape of the bowl under the valve seat and just after the seat into the combustion chamber..more so than massaging the port itself in most LS applications..
12-16-2009, 07:44 PM
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we made
505 on a 6.0 gto with wcch heads
521 on a 6.2 vette with wcch heads
540 on a 416 gto with virgina speed ported heads
all 3 had ported ls3 intakes,and the heads were milled a good bit.on the 416 in barely touched the intake ports and did most of the work on the exhaust.Having the right camshaft is very important with these heads.
505 on a 6.0 gto with wcch heads
521 on a 6.2 vette with wcch heads
540 on a 416 gto with virgina speed ported heads
all 3 had ported ls3 intakes,and the heads were milled a good bit.on the 416 in barely touched the intake ports and did most of the work on the exhaust.Having the right camshaft is very important with these heads.
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12-17-2009, 08:54 AM
#8
Haha...it gets pretty expensive working on both at the same time...I was leaning on doing a 427 when I did the heads but I am just going to let vengeance do the ported and milled Tea heads on the ls3 and see if I can hit that 500+ mark...I am droping it off at the begginning of the year..long waite...But I will post my results...I need 29 to the wheels!
