ls6 heads
Jul 22, 2006 | 10:16 PM
#1
Thread Starter
On The Tree
Joined: May 2005
Posts: 179
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From: Las Vegas
ls6 heads
is it worth the time and effort to use the ls6 head on a 5.3 milling them of course to retain the compression.
how much do i need to mill the heads to retain 61cc or less on the ls6 heads.
and how much can you mill any head before you have head to intake fitment.
how much do i need to mill the heads to retain 61cc or less on the ls6 heads.
and how much can you mill any head before you have head to intake fitment.
Jul 23, 2006 | 09:56 PM
#5
TECH Fanatic
Joined: Oct 2005
Posts: 1,379
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From: Woodstock Ontario Canada
Doesnt the 310hp L33 a;uminum block use the LS6 heads??
The following is from a post elsewhere on this forum.
"""""""""""""""""""""""""""""""""""""""""""""""""" """""""""""""""""""""""""""""""""""""""""""""" """
**One of the L33’s distinguishing features is its engine block. As with the 2004 LM4 Vortec 5300, the L33’s foundation is a cast-aluminum block with pressed-in iron cylinder liners, similar to the block used for GM Powertrain’s LS1 and LS6 car V-8s. The L33 block is exceptionally light; as a result, a fully dressed L33 is 100 pounds lighter than cast iron-block Vortec 5300s (RPOs LM7 and L59).
The L33 takes its cylinder heads from the LS6. Originally developed for the Z06 Corvette, these heads improve airflow in and out of the engine. With their pent-roof combustions chambers and new flat top pistons (the pistons in other Gen III Vortec 5300s have a slight sump in the piston deck), the L33’s compression ratio increases from 9.5:1 to 9.9:1. This increase improves the engine’s volumetric efficiency yet still allows it to achieve full power with regular grade gasoline.
Finally, the L33 is equipped with a higher-lift camshaft. Maximum valve lift increases from 11.6 mm on the LM7 and L59 to 12.5 mm. The new cam and compression ratio are the primary sources of the L33’s increased horsepower. **
"""""""""""""""""""""""""""""""""""""""""""""""""" """""""""""""""""""""""""""""""""""""""""""""" "
It sounds as though if you used the L33 pistons along with the LS6 heads you will experience a compression ratio increase from 9.4:1 up to 9.9:1. The stock LM7 pistons have a slight dish, the L33's are flattops.
peace
Hog
The following is from a post elsewhere on this forum.
"""""""""""""""""""""""""""""""""""""""""""""""""" """""""""""""""""""""""""""""""""""""""""""""" """
**One of the L33’s distinguishing features is its engine block. As with the 2004 LM4 Vortec 5300, the L33’s foundation is a cast-aluminum block with pressed-in iron cylinder liners, similar to the block used for GM Powertrain’s LS1 and LS6 car V-8s. The L33 block is exceptionally light; as a result, a fully dressed L33 is 100 pounds lighter than cast iron-block Vortec 5300s (RPOs LM7 and L59).
The L33 takes its cylinder heads from the LS6. Originally developed for the Z06 Corvette, these heads improve airflow in and out of the engine. With their pent-roof combustions chambers and new flat top pistons (the pistons in other Gen III Vortec 5300s have a slight sump in the piston deck), the L33’s compression ratio increases from 9.5:1 to 9.9:1. This increase improves the engine’s volumetric efficiency yet still allows it to achieve full power with regular grade gasoline.
Finally, the L33 is equipped with a higher-lift camshaft. Maximum valve lift increases from 11.6 mm on the LM7 and L59 to 12.5 mm. The new cam and compression ratio are the primary sources of the L33’s increased horsepower. **
"""""""""""""""""""""""""""""""""""""""""""""""""" """""""""""""""""""""""""""""""""""""""""""""" "
It sounds as though if you used the L33 pistons along with the LS6 heads you will experience a compression ratio increase from 9.4:1 up to 9.9:1. The stock LM7 pistons have a slight dish, the L33's are flattops.
peace
Hog
Last edited by hog; Jul 23, 2006 at 10:01 PM.
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