What LS6 Heads Do I Want?
11-22-2009, 08:17 PM
#21
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I have read it here on tech, corvette forum and many other sites, many times.
here are a couple to get you started.
http://www.idavette.net/hib/02ls6/page2.htm
From an interview with GM design folks: "The ’01 intake weighed 99 grams but the ’02 weighs only 76. The ’01 exhaust weighed 86 grams but the ’02 exhaust weighs 63 grams."
.................
http://www.caranddriver.com/reviews/...t_drive_review
To handle the change, assistant chief engineer John Juriga and his crew added fortified valve springs and lightweight hollow-stem valves, a feature last seen on a Corvette in the late ZR-1's twin-cam LT5 V-8.
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http://forums.corvetteforum.com/c5-t...ls6-heads.html
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Last edited by PSJ; 11-22-2009 at 08:38 PM.
12-01-2009, 08:51 AM
#26
I have read it here on tech, corvette forum and many other sites, many times.
here are a couple to get you started.
http://www.idavette.net/hib/02ls6/page2.htm
From an interview with GM design folks: "The ’01 intake weighed 99 grams but the ’02 weighs only 76. The ’01 exhaust weighed 86 grams but the ’02 exhaust weighs 63 grams."
.................
http://www.caranddriver.com/reviews/...t_drive_review
To handle the change, assistant chief engineer John Juriga and his crew added fortified valve springs and lightweight hollow-stem valves, a feature last seen on a Corvette in the late ZR-1's twin-cam LT5 V-8.
..............
http://forums.corvetteforum.com/c5-t...ls6-heads.html
......................
here are a couple to get you started.
http://www.idavette.net/hib/02ls6/page2.htm
From an interview with GM design folks: "The ’01 intake weighed 99 grams but the ’02 weighs only 76. The ’01 exhaust weighed 86 grams but the ’02 exhaust weighs 63 grams."
.................
http://www.caranddriver.com/reviews/...t_drive_review
To handle the change, assistant chief engineer John Juriga and his crew added fortified valve springs and lightweight hollow-stem valves, a feature last seen on a Corvette in the late ZR-1's twin-cam LT5 V-8.
..............
http://forums.corvetteforum.com/c5-t...ls6-heads.html
......................
Also, someone said "only the C5 ZO6" LS6 had these valves, again not true. The CTS-V was originally built with the LS6 as well, and it had hollow intake and sodium filled exhaust valves.
REGARDLESS, if the heads say 243 or 799, as has been said, the chambers and ports are the same, 799 is a newer replacement for the 243 but is for all intents and purposes the same (the type of casting might be different, there might be some strength differences, I don't know, but the ports and chambers are the same). If the heads came off an LS6, they have lighter valves (except maybe the original 2001 Z06...but I don't believe that either) and if they came off anything else, they don't.
You most likely won't ever be able to notice the difference in the weight of the valves in a street car, so I would do what was mentioned above, and try to find a set off an LS4 or some other high production engine (I believe newer truck 5.3's have 243's on them as well).
12-01-2009, 09:20 AM
#27
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The Zo6 did not get the hollow valves until '02
It was part of the engineering in the '02 cam upgrade.
I believe the 799 heads are cast at a different factory ... maybe in Mexico
if I remember right. I think thats why they got a different casting number
assigned to them.
Some of the newer 5.3 trucks do have 799 heads and the Trailblazer SS intake.
It was part of the engineering in the '02 cam upgrade.
I believe the 799 heads are cast at a different factory ... maybe in Mexico
if I remember right. I think thats why they got a different casting number
assigned to them.
Some of the newer 5.3 trucks do have 799 heads and the Trailblazer SS intake.
12-01-2009, 09:39 AM
#28
BTW, if you go woth the Z06 valves, keep in mind they are a bit longer than other valves.
Also, hollow stem valves can cause an ussie if you ever run into valve float or any piston to valve contact. You have a much better chance of breaking the valve head off and dropping it into the cylinder than on a solid valve which will probably just bend.
Also, hollow stem valves can cause an ussie if you ever run into valve float or any piston to valve contact. You have a much better chance of breaking the valve head off and dropping it into the cylinder than on a solid valve which will probably just bend.
12-01-2009, 12:42 PM
#29
And again, much like you'd probably never be able to tell the difference in a street car between the valves...if you're running a street car close enough to the edge of valve float, or close enough to having piston/valve interference problems...you're running on the ragged edge already anyways, so you should be ready to accept the risks that come with that.
12-03-2009, 07:14 AM
#32
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12-03-2009, 07:53 AM
#33
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the sad thing is I still haven't gotten the LS6 heads yet 
