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Generation III Internal Engine
1997-2006 LS1 | LS6
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Old 11-30-2008, 09:14 PM   #1
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Default 241 heads vs 243 heads

im looking for cheap heads that will add some more power then my 853 heads what should i do. my cam specs are 238/241 609/615. i guess my question is what head will give me more power and will they both bolt right up or will i have to change things?
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Old 11-30-2008, 10:16 PM   #2
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Unported, 243's will make more power. Both will bolt right up.
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Old 11-30-2008, 10:45 PM   #3
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Slightly more power, but if you are having them ported..... You can save money by going with the 241's. They will cost you $300-400 less, leaving that for the porting which will make them damned near even in terms of flow.

241 = $100-125
243 = $400-500
Hand porting job at a decent shop out here = $300-400
CNC porting from patriot = $600

Most port jobs will flow between 280-300cfm.
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Old 12-01-2008, 02:08 PM   #4
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i just did a bit of touching up on some brand new 243s that were bought for $400 brand new and assembled . the touch up along with intake and headers should yield a good gain .
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Old 12-10-2008, 10:20 AM   #5
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i just did a bit of touching up on some brand new 243s that were bought for $400 brand new and assembled . the touch up along with intake and headers should yield a good gain .
Where can you get some brand new 243's for 400 or around that price?

I'd be interested.
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Old 12-10-2008, 10:24 AM   #6
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I am doing the same thing (stock 243's on my 2000 T/A)...Are you going to use OEM head bolts or ARP head bolts?
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Old 12-10-2008, 10:32 AM   #7
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Where did you get your 243's from?
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Old 12-10-2008, 12:08 PM   #8
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Patriot used to sell unported 243s for 4-500 dollars.

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Old 12-12-2008, 04:23 AM   #9
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deleted found my answer
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Old 12-12-2008, 04:48 AM   #10
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what year and engine did the 243's come on? i have a 02 longblock in my car and it has 241's on it.
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Old 12-12-2008, 06:13 AM   #11
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243s are the ls6 heads came on the c5 zo6's. They also came on the ls2 GTO's but i believe the valves, and some other specs are different.
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Old 12-12-2008, 12:45 PM   #12
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243s are the ls6 heads came on the c5 zo6's. They also came on the ls2 GTO's but i believe the valves, and some other specs are different.
Right. The difference between 243's on an LS6 and ones on an LS2 are that the valves on an LS6 are sodium filled resulting in a lighter valvetrain.
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Old 12-12-2008, 03:17 PM   #13
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Right. The difference between 243's on an LS6 and ones on an LS2 are that the valves on an LS6 are sodium filled resulting in a lighter valvetrain.
Ahhh. I knew it was something like that. Thanks for the info.


So no one knows where to get 243's?
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Old 12-12-2008, 04:32 PM   #14
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www.advancedinduction.com
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Old 12-12-2008, 10:17 PM   #15
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LS2 head $320 same as the LS6 head

http://www.sdpc2000.com/product/1257...dAssembly.aspx
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Old 12-13-2008, 09:52 AM   #16
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Thanks, and if i upgrade the vavles with the hollow stem vavles part # 17801930. Then would they be exactly like stock ls6 heads?
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Old 12-13-2008, 10:16 AM   #17
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basically, the c5z had a couple different spring / cam combinations, as the power slightly increased basically every years from 01-04.
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Old 12-13-2008, 04:07 PM   #18
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Quote:
Originally Posted by TheLSgun View Post
Thanks, and if i upgrade the vavles with the hollow stem vavles part # 17801930. Then would they be exactly like stock ls6 heads?
The hollow stem kit is $182, I wounder if thats for one head or two?


Question #1: Why by used 243 head for $600 when you can buy NEW 243 heads for $640???? I say $600 because thats what I have seen them go for used...

Question #2: the 243 head flow better than the 241 head, both stock.
But what about just spending the money to have the 241's CNC'ed,
both would the performe the same, wouldn't they????
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Last edited by 1969mach1; 12-13-2008 at 07:37 PM..
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Old 12-13-2008, 07:34 PM   #19
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I just purchased a set of ls2 heads and intake off of a 05 gto for $600...Is that a good deal?
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Old 12-13-2008, 07:48 PM   #20
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How much of a performance difference are we talking, on a stock LS1, to go from 241's to 243's?
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