0821 head castings?
0821 head castings? I found some 0821 casting heads for fairly cheap. Are these the same as L92 heads? Are they the heads that came off a LS3? Im looking to put them on my 408ci. Thanks
821 is from the LS3. L92 and LS3 have the same port shape and combustion chamber sizes. The 821 should have the lighter valves. Originally GM used a different casting process for the Corvette heads which produced smoother ports.
Cool so these should be exactly what im looking for. Thanks. It looks like they came with yellow valve springs like the ones that came off the c5 z06. I wonder if they are the same ones
They are what you are looking for, they are L92 heads. Casting number doesn't necessarily indicate what valves are in a new head though. I currently have L92 castings on sale CHEAP for $630 for a set of complete heads.
Jesse
Jesse
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Last edited by Scoggin Dickey; Apr 10, 2009 at 05:46 PM.
if the ones im looking at fall through then im giving you a call. thats cheap! what is the most that can be milled off these heads. my 408 has -28cc pistons in it. i had a blower installed but sold it. im just trying to get as much compression and power out of it without changing the pistons. Thanks
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yeah i know it is going to need to be quite a bit of milling. i just dont want to mill so much to where i compromise the head strengh. im guessing somewhere around .045 .050 with .042in head gaskets? i know it wont get me stock comp but hopefully somewhere around 9.5-10.0 i would hope.
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Ok, actually casting number can tell you which head it was originally on a stock head. 821s were LS3, the difference between the casting numbers is the valve seat between LS3 and L92. You're not going to have a performance or flow difference based on the casting number, it really is not relevant
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https://ls1tech.com/forums/generatio...omparison.html
Which valve is in the heads your looking at?
You've got LS3 heads.
-Jesse
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WHIPPLE Superchargers, Procharger, Magnuson, Powerbond Sale, HPTuners packages!, Trickflow, AFR, PRC, CHE Trunion upgrade, $100 7.400" pushrod set, Custom Cam of your choice
800-456-0211 / PM / Facebook
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Last edited by Scoggin Dickey; Apr 13, 2009 at 08:32 AM.
Lol noob bringing it from the 3yr old death, no sir you CANNOT use Ls3/L92/L99 heads on an Ls1 because you need a minimum bore size of 4.0 in.
