stock heads ls1 hp limits
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Teching In
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stock heads ls1 hp limits whats the horsepower potential of a stock head 99 ls1? i'm talking like you change camshaft rockers springs intake throttle body and get it tuned for 93 what is the best you can hope for i have a 37 chevy that with this engine does pretty good with that 6 speed even though the gears are to high even for the street 29inch tires with 4.11s. i'm kinda stuck with sucking hot air due to clearance between the engine and radiator. i thought about doing a mild porting and back cutting the valves.
Thread Starter
Teching In
Joined: Sep 2011
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sorry i should have said n/a i know that boosted i'd easily obtain more power than id ever need but it be cool to get in the 400rwhp numbers i know a guy with a ls2 thats making that but don't know if it can be done with the ls1 and still be street friendly
I'm running stock 853 casting heads on my 2000 LS1 (Almost identical to 241 casting I'm told). I've been searching around looking at getting them cnc ported/polished and a multi angle valve job. So far, I've been hearing about gains anywhere from 25-40 rwhp. Advanced Induction is one of the companies I've been in contact with. Their work speaks for itself. I've also spoken with AES Racing about performing the same work. The bottom line is, you can still make sizable power increases with worked over stock castings. Be prepared to shell out some cash, but for the money you will see some nice gains.
Last edited by Rare96LT1Formula; Jan 21, 2012 at 02:22 PM.
My car made 389rwhp with stock 241s, worn out valve springs and a banged up ypipe thru an a4. There are a bunch of people who have made over 400 rear wheel with stock 241s.
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I'm running stock 862 casting heads on my 2000 LS1 (Almost identical to 241 casting I'm told). I've been searching around looking at getting them cnc ported/polished and a multi angle valve job. So far, I've been hearing about gains anywhere from 25-40 rwhp. Advanced Induction is one of the companies I've been in contact with. Their work speaks for itself. I've also spoken with AES Racing about performing the same work. The bottom line is, you can still make sizable power increases with worked over stock castings. Be prepared to shell out some cash, but for the money you will see some nice gains.
Thanks for that load of steaming crap. Maybe do some research next time you go making claims you cannot support. 
http://www.advancedinduction.com/LSX...cGMLS1Head.php
http://www.advancedinduction.com/LSX...cGMLS1Head.php
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Verdad Gallardo Advanced Induction is VERY well known in the LS community and I can assure you they are NOT making empty promises. There is a thread in the Dyno section of a member here making 49rwhp just from there cnc porting on his 243 heads. Hard to argue with results. Might want to do some more research before you start making suggestions around here.
Girls, Girls. Quit fighting. First of all the post was about 241 heads not 243 heads which are much better especialy when ported. You're not going to get 40rwhp from p n p 241 heads. Period. Maybe if you have an incredibly huge cam that runs like crap as a before porting example.
Girls, Girls. Quit fighting. First of all the post was about 241 heads not 243 heads which are much better especialy when ported. You're not going to get 40rwhp from p n p 241 heads. Period. Maybe if you have an incredibly huge cam that runs like crap as a before porting example.
Straight from AI's website:
Typical gains for our CNC work are in the 40rwhp SAE range over the as cast 241, and many 346cid LS1's manage 420-460rwhp SAE with bolt-ons and one of our daily drivable HR cam grinds.
I'm not going to debate proven results with you, I'll let the sponsors do that.
Just realized I posted the incorrect casting numbers. They're actually 853's which are essentially the same cylinder head as the 241. Regardless, I'll post a build thread and be sure to send you the link when completed sir.
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yes because i have only seen 241 p&p got 24rwhp so i dont think you will gain any more. I just didnt want you to think you will gain over 25rwhp so you dont get your hopes up. I hope you can get 40rwhp but i dont think that will happen.
I understand now. I was merely trying to give the OP a realistic idea of what his stock heads could do. Obviously, it's all going to depend on who does the work. In my experiences with aftermarket modifications, you usually get exactly what you pay for. In the case of Advanced Inductions, and TEA, I have no reason to doubt their claims of 35-40 rwhp gains.
I understand now. I was merely trying to give the OP a realistic idea of what his stock heads could do. Obviously, it's all going to depend on who does the work. In my experiences with aftermarket modifications, you usually get exactly what you pay for. In the case of Advanced Inductions, and TEA, I have no reason to doubt their claims of 35-40 rwhp gains.
From AI: "Typical gains for this CNC work are in the 40-55rwhp SAE range over the as cast 241, and 346cid LS1's can manage 440-470rwhp SAE with bolt ons and one of our daily drivable HR cam grinds."
With a cam and bolt on's.
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Well after using the "Google" i found that the 853 heads are sand casted not die casted which gives the 241 better flow. More cc. I also saw everyone saying dont put any money in to 241 or 853 heads. They all said get some used 243's which out flow the 241's by a bit. So if i was you i would buy a used set of 243's for 400 bucks then maybe get them ported and polished and you would gain some where in the range of 40 rwhp. that is 243's p&p vs. 853 heads. Which is well worth it in my opinoin have well less than 700 dollars in heads and gain about 40. This is what i would do on a buget. If your not on a buget or want to spend a little more look up some tsp ls6 heads or 5.3 heads. If your not on a buget get some afr 210's, 215's, or some tsp prc 215 heads. These three heads are very nice and show big gains.
OP was wondering what his STOCK heads could do.
I know. I was just pointing out the gains the heads could make with cam and other stuff.