***243 heads from a C5 Z06*** - Pontiac GTO Forum
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post #1 of 12 (permalink) Old 12-19-2012, 08:08 PM Thread Starter
 
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***243 heads from a C5 Z06***

C5 Corvette LS6 243 Aluminum Heads 1997 2004 | eBay

I have am 04(LS1 bone stock from air filter to exhaust tips) with an M6.


I spotted these on ebay and my boss, read a wife, has given me about $700 to play with on toys for the car. Would these work on my car?

To the uninitiated this seems to be a decent deal. If they are then I may pull the trigger. If not where is a good place to source some 243 heads from?

My goals are to put down 400HP/TQ at the wheels. I feel like heads, cam, etc... are the most meaningful places to make real life significant gains. Because of emissions here in RI I feel like if I did headers shorty headers and catted mids are my only real viable option to keep this car a real DD.

As always thanks for your information guys.

'Moe
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post #2 of 12 (permalink) Old 12-19-2012, 09:09 PM
 
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I'd pass. I see them sell for $200 less all the time.

They are a great budget head upgrade for the LS1 though. Def worth it.

Example same price but with upgraded springs ready for a cam: http://forums.corvetteforum.com/c5-p...s-on-them.html

2003 Corvette Z06 - MGW shifter, Corsa X pipe, Corsa Xtreme exhaust, Texas Speed long tubes w/o cats, PowerStop rotors/pads, Conti DWS tires, C6Z51 F&R sways, C5R headlights, tuned

04 GTO - sold
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post #3 of 12 (permalink) Old 12-19-2012, 09:20 PM Thread Starter
 
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I appreciate the information. I am really trying to mod this car like a MAN and not some young cat. I feel like the cat back will be amongst the last things I mod. I am really trying to take things from an engine back approach in terms of power adding mods.

Any other "budget" minded heads/cams I should be looking at?

'Moe
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post #4 of 12 (permalink) Old 12-19-2012, 09:42 PM Thread Starter
 
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Curious if the 799 casting heads are worth the investment of money and time. From my research it seems the 799 casting number heads are essentially 243 but cast ina different location.

LS6 5 7L GM Aluminum Cylinder Heads Casting 799 | eBay

'Moe
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post #5 of 12 (permalink) Old 12-20-2012, 03:11 AM
 
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Either one, are good heads, but to make a real difference, they
need to be ported. CNC porting is the cheapest. Also, the combustion
chambers need to be correct for the compression ratio you want to run.
You may need to mill the decks. Not all 243s are Z06. The Z06 ones have
smaller combustion chambers and lighter weight sodium filled valves.

Larry

2005 GTO Fast - 2004 Z06 Faster - 1984 Honda V65 Magna Fastest
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post #6 of 12 (permalink) Old 12-20-2012, 09:13 AM
 
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243 heads are a great midway step for an LS1. Most people say they're worth about 20 hp. I did them before my cam and the car pulled noticeably harder up top, which is what you'd expect.

I'd stay away from those heads at any price. They look like they're in rough shape. I picked up a pair with 30K miles off an LS2 goat for $325 for reference. Look on LS1tech or LS1gto.

2004 GTO M6 Torrid Red
Ai ported 243s-ported Fast 90-FTI Tigershark cam-Kooks headers & cats ???hp/???tq
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post #7 of 12 (permalink) Old 12-20-2012, 08:27 PM Thread Starter
 
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I am conidering buying a pair of stock heads or 243s and having these guys do the CNC/rebuild work.

Advanced Induction - LSX Cylinder Heads

Seems I can get 40RWHP out of reworked 241 heads for about $1,000 plus the cost of the donor heads to be rebuilt(seems they can be had for $150 or so online)

Are there any "off the shelf" heads I can purchase for about the same money that will yeild similar results AND maintain DD duty.

'Moe
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post #8 of 12 (permalink) Old 01-01-2013, 05:36 PM
 
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AI is an oustanding shop. Everyone on the other forum who has used them has had positive results. They're where I'll be sending my heads when I have the dough.

2004 GTO M6 Torrid Red
Ai ported 243s-ported Fast 90-FTI Tigershark cam-Kooks headers & cats ???hp/???tq
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post #9 of 12 (permalink) Old 01-02-2013, 09:29 AM Thread Starter
 
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Yeah they seems to have rave reviews. I need to call them and figure out if the reuse the stock components(valves, lifters, etc...) or if I can send them a bare head and for the price listed get back fully worked/rebuilt heads.

'Moe
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post #10 of 12 (permalink) Old 01-02-2013, 11:27 AM
 
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Save your money. You don't need ported heads to hit 400 hp. A set of stock LS6/LS2 heads will do nicely.

2003 Corvette Z06 - MGW shifter, Corsa X pipe, Corsa Xtreme exhaust, Texas Speed long tubes w/o cats, PowerStop rotors/pads, Conti DWS tires, C6Z51 F&R sways, C5R headlights, tuned

04 GTO - sold
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