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Generation III Internal Engine
1997-2006 LS1 | LS6
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Old 10-28-2012, 11:49 AM   #1
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Default 862 heads

Okay i'm really new to the LS world, and I think I know where I pretty much stand with my cam and intake, but not sure about my 5.3 (862) heads. I've seen several posts on the 5.3 heads themselves, but none of them say which casting number they have. So my question is...how good are these heads? They were purchased from Texas Speed by the original owner. I'm assuming they were ported/polished and whatnot. Also considering my setup, would I benefit from a Fast intake over my LS6? How about the bump stop mod, or a ported throttle body...the current one is stock and not ported. Just trying to gather some info here and learn more about what I have

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Old 10-28-2012, 10:45 PM   #2
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No one is familiar with the 862 heads?
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Old 10-28-2012, 11:29 PM   #3
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If they are from Texas speed and are 5.3 they are more than likely stage 2.5 heads with a cnc port and bigger valves, they are popular heads due to their cheap price over an aftermarket head
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Old 10-29-2012, 11:56 AM   #4
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If it has aftermarket heads and cam I would look at the FAST if you can. It will make more power then LS6 intake. Get a throttle body to match and you will be good to go.
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Old 10-29-2012, 09:03 PM   #5
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Thanks guys! So what FAST intake do you recommend...there are different ones correct? What would be a good throttle body to get? What about the MAF? Both of these are currently stock on my car.
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Old 10-30-2012, 07:42 AM   #6
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Go right with a 102/102 setup. Much better runners and an overall better intake. Will be the last intake you have to buy.
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Old 10-30-2012, 05:16 PM   #7
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If you have the cash for it get the 102. It will make a littler bit better power. If you don't try for 92mm, it still makes great power for a setup like this.
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Old 10-30-2012, 07:14 PM   #8
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Ok thanks for the info. What about the throttle body and MAF? Are the gains worth the money for those two things? Both are currently stock.
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Old 10-31-2012, 01:35 PM   #9
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For throttle body I would go with what matches the intake. Either of the larger intakes will require the larger throttle body. For MAF we would run the SLP or GM 85mm MAF.
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Old 10-31-2012, 06:18 PM   #10
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Excellent..thank you! One last question about the whole intake, tb, and maf setup..if I do all this will I lose a good portion of my low-midrange power in favor of pure top end performance, or will my heads and cam support a nice gain all around? Also, would this combo of parts be hard to tune or anything?
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Old 10-31-2012, 09:30 PM   #11
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You might lose a little low end, but with this combination (assuming the Torquer v2 in your sig), this would still be an excellent all-around combination. It would still have excellent midrange, and great top-end as well.
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Old 10-31-2012, 09:49 PM   #12
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Your not really losing anything. The fast intake moves the power band. If you look at dyno graphs and do averages, you gain.
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Old 10-31-2012, 09:59 PM   #13
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Good deal! What about the tuning? I only ask because i've heard it could be a bit tricky to tune one of these intakes and whatnot. Not sure if that's just internet garbage or some truth to that. Yes it is a Torquer V2 that I have as well.
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Old 10-31-2012, 10:29 PM   #14
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Average power should be higher, but any reputable tuner should be able to handle that combination with ease!
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Old 10-31-2012, 10:45 PM   #15
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Cool! Well now I know what i'm saving for lol So how much more power might I be looking at roughly? I'm assuming the hp and torque will carry out a bit further as well, along with that average overall increase under the peak? Right now I peak at about 6300, and it carries pretty flat till 6800 where the rev limiter hits
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Old 11-01-2012, 12:12 AM   #16
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I've seen gains from the fast as high as 25, I'd expect 10-20 on your setup. It sounds like a lot of money for little gain, but it will be the last intake you buy. If you go larger cubes, turbo, etc in the future, you won't have to worry about the intake. And you won't be leaving power on the table now.
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Old 11-01-2012, 05:49 PM   #17
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Quote:
Originally Posted by JohnJanz@Texas-Speed View Post
If you have the cash for it get the 102. It will make a littler bit better power. If you don't try for 92mm, it still makes great power for a setup like this.
Really? I have a VERY similar setup to the OP and I would have figured a 102 was WAY overkill. I was thinking 92 for sure, even if I end up going with a 383 LS1. I should go with a 102, huh?
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Old 11-01-2012, 08:00 PM   #18
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No such thing as overkill. Tb opening size has nothing to do with the size of your engine. It's simply throttle control
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Old 11-01-2012, 08:23 PM   #19
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10-20 hp is pretty decent as long as it's not just a pure peak number, but rather a decent increase in the mid range as well. I've been doing a little research, and it looks like it would create a broader torque curve as well...that's really important to me! Wish these things weren't so damn expensive lol
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Old 11-02-2012, 11:26 AM   #20
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Quote:
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No such thing as overkill. Tb opening size has nothing to do with the size of your engine. It's simply throttle control
...That would be cool if the difference between the 92 and 102 was only "TB opening size," but doesn't the 102 have a larger volume plenum/longer intake runners? In other words you will basically lose low end (due to slower intake velocities) to gain more top end ('free-er' flowing in the high RPMs)?
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Old 11-02-2012, 11:26 AM
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