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Generation III External Engine
LS1 | LS6 | Bolt-Ons | Intakes | Exhaust | Ignition | Accessories

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Old 06-23-2011, 11:41 AM   #1
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Default Why do i have 862 heads on my ls1?

I have an 01 trans am, i looked at my head casting numbers today and noticed that my passenger side head has 862, and the driver side has 864 as the last three.....i did a search on em an they say 5.3 heads....did some f-body's come with these or what?
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Old 06-23-2011, 01:07 PM   #2
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Casting #862 99-00 4.8-5.3l trucks. Your engine has different heads than what came on the engine from the factory.
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Old 06-23-2011, 01:14 PM   #3
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Should have 241's.
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Old 06-23-2011, 01:18 PM   #4
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I thought that 5.3 heads flow just as well as 241s but have a smaller chamber meaning higher compression.

So someone upgraded the heads on the car before you bought it. I for one would be happy that I got upgraded heads if they are indeed the 5.3s.
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Old 06-23-2011, 01:27 PM   #5
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Possibly ported 5.3 heads

Do you have an aluminum or iron block...also possible someone swapped the ls1 for a 4.8/5.3 block or 6.0 block
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Old 06-23-2011, 05:28 PM   #6
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but whats the deal with the 864 head? and from what ive looked up the 5.3 head flows very very close to the ls1 heads even with the smaller valves.

but as stated early id see if your block is iron or if you can get to any identifying numbers it may have had the motor pop in it and the previous owner dropped a 5.3 off in it
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Old 06-23-2011, 05:30 PM   #7
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but whats the deal with the 864 head? and from what ive looked up the 5.3 head flows very very close to the ls1 heads even with the smaller valves.

but as stated early id see if your block is iron or if you can get to any identifying numbers it may have had the motor pop in it and the previous owner dropped a 5.3 off in it
If he was planning on running a turbo, that might be a good thing...
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Old 06-23-2011, 06:13 PM   #8
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i just checked the block, the block is cast iron....where are the casting numbers located on 5.3 and 6.0's? the guys with the stock ls1 cant beat me so im hoping its a 6.0 block, and it does have the ls6 intake
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Old 06-23-2011, 06:16 PM   #9
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You aren't going to like this...but the number on my LS1/6 is on the back of the driver's side of the head surface. There may be other indicators though.
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Old 06-23-2011, 06:44 PM   #10
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i just checked the block, the block is cast iron....where are the casting numbers located on 5.3 and 6.0's? the guys with the stock ls1 cant beat me so im hoping its a 6.0 block, and it does have the ls6 intake
def not an "ls1" then, thats for sure. On the front of the block close to the sides and behind the waterpump it will say what size the block is. Might read 4.8/5.3 or 6.0 depending on what you have. Could be an lq4 or lq9 6.0liter truck block but to put 5.3heads on there would be silly unless they are super ported. Only way to tell if ported is if you pull the intake manifold off and see if any work has been done to the ports. Also pull valve covers and see if they have upgraded springs or not. Most likely is a lm7 5.3 truck block but that may not be a bad thing as it could have been bored out from 327cu to an ls1 size of 346. No way to check this unless you pull the heads. Ls6 intake manifold comes on 01-02 fbodies so that is normal. Post up when you figure out more info on what you have.

I circled the block size location on the engine below so you can see where to look.
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Why do i have 862 heads on my ls1?-block-size.jpg  
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Old 06-23-2011, 07:08 PM   #11
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only thing i can visually see on the block without taking anything off is G12
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Old 06-23-2011, 09:10 PM   #12
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Mine has a 6.0 Iron block 408 and I also dont know much about whats in it. The 6.0 on my block was stamped on the back of the block. I saw it when I pulled the trans.
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Old 06-23-2011, 10:49 PM   #13
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My 6.0 is also stamped on the front I can't remember which side though I will look tomorrow hi I believe it is behind the alt
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Old 06-23-2011, 11:31 PM   #14
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this is getting interesting
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Old 06-24-2011, 12:35 AM   #15
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Ill have to check when i get off work, da yung folks with the stock ls1 cars cant beat me, and i pulled on a 02 camaro with an all stock 6.0 n it....would it be too much of a bad thing if it is the 5.3?? I had the car since february
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Old 06-24-2011, 12:59 AM   #16
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No not if your beating 6.0's lol. Definately wana hear what you got tho.
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Old 06-24-2011, 03:46 PM   #17
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Ill check the front of mine to see if its marked.
What exhaust is on it?
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Old 06-24-2011, 08:52 PM   #18
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factory exhaust....anybody have pics of the passenger side of a 5.3 & 6.0 block, and pics of the front of the 5.3 & 6.0 block
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Old 06-24-2011, 09:24 PM   #19
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LS2
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Old 06-24-2011, 10:25 PM   #20
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only casting # i can see is s11 on the passenger side of the block, and g12 on the passenger side front
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Old 06-24-2011, 10:25 PM
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