FS > LSA # 863 heads
11-02-2009, 04:01 PM
#1
FS > LSA # 863 heads I have two sets of ultra low mile, casting #863 Caddy LSA cyl heads. These are special in a number of ways. but same as the LS9 heads except for non TI (but light type intake valves.). These have a max of a few hundred miles and are same CR (68cc). Great heads for >4"bore. LQ4-9,LS2,LS3,LS7.
GM says:
"The LSA heads feature a unique "wing'' cast into each intake port to promote a swirling motion that blends the pressurized air-fuel charge. The heads are also cast from a premium A356-T6 alloy, which better manages the heat generated in a supercharged engine. A356-T6 pays particular dividends in the thin bridge area between the intake and exhaust valves, where effective heat dissipation is crucial to both performance and long-term durability. Finally, the LSA heads are rotacast. This process rotates the head mold as the molten alloy cools and essentially eliminates porosity, or microscopic pockets of air trapped in the casting. Rotacasting delivers a stronger part that helps maintain performance and structural integrity over the life of the engine.(The heads are nearly identical between the LS9 and LSA)
Valves are among the most heat-stressed parts in an engine, and their wear resistance is crucial to long-term durability. Those in the LSA are manufactured from a high-chromium steel alloy called SilChrome 1 (The only difference between the LSA's exhaust valves, and the LS9s is that the LS9's are filled with sodium for the extra heat protection -- the LS9s intake valves are made of titanium.), with thicker heads than most other Gen IV V-8s. They promote heat transfer away from the valve face and valve guide to the cooler end of the stem, where it more readily dissipates. This maintains a lower, more uniform valve temperature, reducing wear on the valve guide for better alignment and a consistent seal between the valve seat and valve face over the life of the engine. The intake valves measure 55 mm in diameter and the exhaust valves, 44 mm.
$650/set +actual shipping cost.
Bruce
GM says:
"The LSA heads feature a unique "wing'' cast into each intake port to promote a swirling motion that blends the pressurized air-fuel charge. The heads are also cast from a premium A356-T6 alloy, which better manages the heat generated in a supercharged engine. A356-T6 pays particular dividends in the thin bridge area between the intake and exhaust valves, where effective heat dissipation is crucial to both performance and long-term durability. Finally, the LSA heads are rotacast. This process rotates the head mold as the molten alloy cools and essentially eliminates porosity, or microscopic pockets of air trapped in the casting. Rotacasting delivers a stronger part that helps maintain performance and structural integrity over the life of the engine.(The heads are nearly identical between the LS9 and LSA)
Valves are among the most heat-stressed parts in an engine, and their wear resistance is crucial to long-term durability. Those in the LSA are manufactured from a high-chromium steel alloy called SilChrome 1 (The only difference between the LSA's exhaust valves, and the LS9s is that the LS9's are filled with sodium for the extra heat protection -- the LS9s intake valves are made of titanium.), with thicker heads than most other Gen IV V-8s. They promote heat transfer away from the valve face and valve guide to the cooler end of the stem, where it more readily dissipates. This maintains a lower, more uniform valve temperature, reducing wear on the valve guide for better alignment and a consistent seal between the valve seat and valve face over the life of the engine. The intake valves measure 55 mm in diameter and the exhaust valves, 44 mm.
$650/set +actual shipping cost.
Bruce
Last edited by See5; 11-03-2009 at 08:35 AM.
11-29-2009, 02:40 PM
#6
The design is beefed up to accommodate boost and LS9/LSA head gaskets are also special so the combo is clean sheet new. However I know of no head that is immune to excessive boost.
They are compatible with any rectangle port 6.2 intake manifold such as L92, L76,LS3 or the factory superchargers.
They are compatible with any rectangle port 6.2 intake manifold such as L92, L76,LS3 or the factory superchargers.
Last edited by See5; 11-29-2009 at 05:15 PM.
12-02-2009, 04:36 PM
#8
ONLY the LS9 has M12 bolts rest of LSs use M11s. I must assume your block is not a LS9?
http://corvetteactioncenter.com/spec..._pursuit6.html
Heads shipped today
http://corvetteactioncenter.com/spec..._pursuit6.html
Heads shipped today
Bruce,
Don't ship these yet! I still have not heard from you about the head bolts being bigger, did you get that confirmed? I don't know if I want to tap my block for bigger bolts because if I do then I will not be able to run other heads like the L92's. I need to hear from you about this before you ship them!!!
DM
Don't ship these yet! I still have not heard from you about the head bolts being bigger, did you get that confirmed? I don't know if I want to tap my block for bigger bolts because if I do then I will not be able to run other heads like the L92's. I need to hear from you about this before you ship them!!!
DM
Last edited by See5; 12-02-2009 at 04:43 PM.
02-15-2010, 02:27 AM
#10
I want a set of these. They also come with the rockers like your LS3 heads correct?
Can you ship them USPS priority flat rate for me? I have shipped all my items including heads this way and it works great!
Please PM me whether you prefer Paypal or Visa. I will send money right away.
Thanks,
Gary
Can you ship them USPS priority flat rate for me? I have shipped all my items including heads this way and it works great!
Please PM me whether you prefer Paypal or Visa. I will send money right away.
Thanks,
Gary
