what ls3 style heads are these?????

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Feb 18, 2012 | 02:45 PM

#21

bww3588

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From: Chillicothe/Lima, Ohio

That's odd, yours have the numbers exactly opposite where mine are. I'm looking a my brand new 0821 ls3 heads and the numbers are between the intake runners, not on them.

Don't rule out an over the counter warranty replacement either.

Feb 18, 2012 | 03:41 PM

#22

anheuserbusch08

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i picked them up at a local junkyard for 200 bucks they said it came off an iron block 6 liter.

Last edited by anheuserbusch08; Jul 24, 2012 at 05:31 PM.

Feb 18, 2012 | 05:03 PM

#23

Mr.L88

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X used to be the GM code for experimental. Not sure if that is still the case; but in years past it was. How do you know the valves are sodium filled?

Feb 18, 2012 | 07:24 PM

#24

97badass

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He licked them and they were salty. Haha

Feb 18, 2012 | 07:33 PM

#25

midevil1

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weigh the valves if you can. I'm not doubting what they will are, but it will help in finding the origin of those heads.

Feb 19, 2012 | 04:23 PM

#26

anheuserbusch08

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Quote:

Originally Posted by midevil1

weigh the valves if you can. I'm not doubting what they will are, but it will help in finding the origin of those heads.

they have part numbers on the top of the valve stem

12565312 EY

cross referenced them on google and came up with ls6 sodium filled exhaust valves... kinda weird how theyre actually a tad smaller than the rest of the l92 heads. my heads came with ls6 springs too.

Last edited by anheuserbusch08; Feb 20, 2012 at 08:14 AM.

Feb 20, 2012 | 12:23 AM

#27

midevil1

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Quote:

Originally Posted by anheuserbusch08

they have part numbers on the top of the valve stem

12565312 EY

cross referenced them on google and came up with ls6 hollow stem valves... kinda weird how theyre actually a tad smaller than the rest of the l92 heads. my heads came with ls6 springs too.

They maybe LS6 exhaust valves, but the intakes can't be LS6 if they are 2.16.

Feb 20, 2012 | 08:14 AM

#28

anheuserbusch08

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Quote:

Originally Posted by midevil1

They maybe LS6 exhaust valves, but the intakes can't be LS6 if they are 2.16.

thanks for the type-o i fixed it.

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Feb 25, 2012 | 08:00 AM

#29

85MikeTPI

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From: Newark, DE

Any further info on these? Have you verified valve specs? I'm wondering since the small-bore L92/LSX heads use LS6 sized exh valves, and the "X" part# if you're looking at something from GMPP and not GM production. The small bore heads are still listed at 70cc, so I'm thinking they have to open up the chambers some to achieve that??

Feb 25, 2012 | 08:20 AM

#30

burgers

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From: Newton KS

Early version L92

Feb 25, 2012 | 08:31 AM

#31

85MikeTPI

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Quote:

Originally Posted by burgers

Early version L92

References? Pictures?

I have 2007 (first production year) L92 heads from an Escalade EXT and they don't look like that.

Feb 25, 2012 | 03:41 PM

#32

midevil1

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I have some 07 823's and they are identical to the newest 821.

These heads are interesting. They might be great for boost too.

Jul 21, 2012 | 06:53 PM

#33

anheuserbusch08

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Quote:

Originally Posted by midevil1

I have some 07 823's and they are identical to the newest 821.

These heads are interesting. They might be great for boost too.

found out they are prototype heads on work trucks like the hertz rentals and bread work trucks lol i dont know what im going to do with these heads yet...