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H/C/I GTO loses to bolt on/cammed 3v GT

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Old 01-31-2011, 12:54 PM
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Originally Posted by jdiddyws6
Wrong.
Right.

http://www.performancetrucks.net/for...d.php?t=465841

https://ls1tech.com/forums/generatio...243-heads.html
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Old 01-31-2011, 01:05 PM
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Originally Posted by jdiddyws6
Wrong.
^ Uhhh somebodies an idiot.

Which is quite suprising looking at his join date. You'd think he would of atleast learned that much by now.
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Old 01-31-2011, 01:18 PM
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Originally Posted by Redfire 03
^ Uhhh somebodies an idiot.

Which is quite suprising looking at his join date. You'd think he would of atleast learned that much by now.
Eh probably another one of those wanna-be tech gurus or something.

I actually have a set of 243's off a '03 Tahoe sitting in the garage right now. Getting ready to be all prettied up and going on the 347. Picked those heads up off Ebay for $260 shipped. Can't beat that!
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Old 01-31-2011, 01:24 PM
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Originally Posted by LT/LS Guy
Eh probably another one of those wanna-be tech gurus or something.

I actually have a set of 243's off a '03 Tahoe sitting in the garage right now. Getting ready to be all prettied up and going on the 347. Picked those heads up off Ebay for $260 shipped. Can't beat that!
Can't wait till its done. Ill have to come up there and some friendly runs with you.
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Old 01-31-2011, 01:26 PM
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Originally Posted by Redfire 03
Can't wait till its done. Ill have to come up there and some friendly runs with you.
Sounds good!
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Old 01-31-2011, 03:31 PM
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Originally Posted by LT/LS Guy
The 5.3, LS2 and LS6 all use the same 243 casting cylinder heads with the only differences being the LS2/LS6 received Yellow springs and the LS6 got hollow intake/sodium-filled exhaust valves exclusively. In short, there all the same.
x2!

5.3, LS2, LS6 = 243 castings
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Old 01-31-2011, 06:17 PM
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Originally Posted by LT/LS Guy
The 5.3, LS2 and LS6 all use the same 243 casting cylinder heads with the only differences being the LS2/LS6 received Yellow springs and the LS6 got hollow intake/sodium-filled exhaust valves exclusively. In short, there all the same.

Thanks, I did not know that. Learn something new every day.
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Old 01-31-2011, 06:22 PM
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Originally Posted by 06blackGTO
Thanks, I did not know that. Learn something new every day.
Heck, me too.
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Old 01-31-2011, 06:25 PM
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FWIW, 799 = 243, just cast in a different plant I believe (in case some didn't read those thread posted).
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Old 01-31-2011, 06:33 PM
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Originally Posted by WSsick
FWIW, 799 = 243, just cast in a different plant I believe (in case some didn't read those thread posted).
Correct, basically 243's produced from mid-2007 on up. A lot of folk don't know 799=243 that's why you can get the killer deals on them.
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Old 01-31-2011, 07:50 PM
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Originally Posted by LT/LS Guy
The 5.3, LS2 and LS6 all use the same 243 casting cylinder heads with the only differences being the LS2/LS6 received Yellow springs and the LS6 got hollow intake/sodium-filled exhaust valves exclusively. In short, there all the same.
Always thought the 5.3L heads were iron until I read into it. Who'da thunk GM would put LS2 heads onto one of there baseline V8's from 2005 on up...
Originally Posted by LT/LS Guy
Correct, basically 243's produced from mid-2007 on up. A lot of folk don't know 799=243 that's why you can get the killer deals on them.
799 heads are bigger combustion chamber (72cc) heads off the LQ4/9 6.0L engines I believe. I also read one thread that said they have smaller valves than the 243 heads. ??
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Old 01-31-2011, 07:53 PM
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Originally Posted by Sticks n Stones
799 heads are bigger combustion chamber (72cc) heads off the LQ4/9 6.0L engines I believe. I also read one thread that said they have smaller valves than the 243 heads. ??
Nope, 799 = 243. You are thinking of the 317 heads.

*I think* that on the 243s that came on actual LS6 motors, you got sodium valves and not on anything else the 243s came on (5.3s, LS2s, LS4s, etc.).
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Old 01-31-2011, 08:03 PM
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Originally Posted by WSsick
Nope, 799 = 243. You are thinking of the 317 heads.

*I think* that on the 243s that came on actual LS6 motors, you got sodium valves and not on anything else the 243s came on (5.3s, LS2s, LS4s, etc.).
Hollow intake and sodium exhaust valves for the LS6.
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Old 01-31-2011, 08:05 PM
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Originally Posted by Sticks n Stones
799 heads are bigger combustion chamber (72cc) heads off the LQ4/9 6.0L engines I believe. I also read one thread that said they have smaller valves than the 243 heads. ??
Yep 6.0/317's are what your thinking of.
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Old 01-31-2011, 08:07 PM
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wtf was GM thinking with all the damned different head numbers? So annoying...
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Old 01-31-2011, 08:13 PM
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Originally Posted by LT/LS Guy
Hollow intake and sodium exhaust valves for the LS6.
Thanks.
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Old 01-31-2011, 08:15 PM
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Originally Posted by Sticks n Stones
wtf was GM thinking with all the damned different head numbers? So annoying...
I agree. It's just confusing.
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Old 01-31-2011, 08:53 PM
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Originally Posted by NightmareTA
Seems like a load of BS to me. H/C 3V's put like 340 WHP down. !
My best friends cam only 3v made 350whp. With just a blower added on 12psi it made 485. Now its a built 302 with a new cam and 18psi. Im predicting around 700whp.
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Old 01-31-2011, 09:21 PM
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The 3v in the vid made 330std
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Old 01-31-2011, 09:38 PM
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330whp H/C? Why bother.
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