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Pontiac G8 2008-09 & Chevrolet SS 2014+ LSX based RWD 4-door sedans

New to the G8 world.

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Old 07-31-2011, 11:51 AM   #1
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Default New to the G8 world.

Recently got to an accident in my (ls4) impala ss and had been considering a g8 for a while so well see what happens on a few days after I hear from the insurance.
But I had recently got a set of 243 heads, ported ,milled (30 over) wit a valve job ,1518 springs,titanium retainers and ls6 valves which didnt make it on the car and was wondering if they would work on G8 GT?
Also anything I should look for when checking them out and making a purchase?
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Old 07-31-2011, 04:07 PM   #2
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243 heads would work on the car, but you would also have to change out the intake. The 243 ported heads would only be marginally if better then the stock g8 heads. Get the g8 heads milled, cleaned up, valve job and they are night/day better then the ported 243 heads.
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Old 07-31-2011, 05:34 PM   #3
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G8 GT heads flow .316 intake and 189 exhaust at .600 in stock trim FYI you would def love the car though
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Old 07-31-2011, 06:48 PM   #4
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Make sure there's no vibration at highway speeds, this is a common issue with quite a few G8's and it's hard to eliminate. And make sure the trans shifts correctly, some have a 2-3 shift flare. Also some of them have suspension clunking in the front, but that can be fixed under the 3yr/36000 mile warranty.

I've had the front lower control arms replaced on mine and recently had the front strut bushings & bearings replaced, which was all done under warranty. Other than that I've had no issues at all with the car and I highly recommend buying one.
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Old 08-01-2011, 06:48 AM   #5
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Get an 09, cuz they have a 5 year/100,000 mile warranty
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Old 08-01-2011, 09:45 AM   #6
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If I got an 08 it wouldnt have the warrenty? N doing a cai wouldnt void the warrenty ? Its been years since I had one. N thanks yu guys il pay close attention.
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Old 08-01-2011, 04:53 PM   #7
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The 2008 G8 also has a 5yr/100,000 mile POWERTRAIN warranty. A CAI will not void the warranty. If they can prove that it damaged the motor then they can deny coverage for the repair, but they can't refuse to fix anything on the car just because it's installed.
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Old 08-01-2011, 07:41 PM   #8
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Quote:
Originally Posted by RedHotG8 View Post
The 2008 G8 also has a 5yr/100,000 mile POWERTRAIN warranty. A CAI will not void the warranty. If they can prove that it damaged the motor then they can deny coverage for the repair, but they can't refuse to fix anything on the car just because it's installed.
Ok good to know. As far as the heads go . I head the ls3 has lighter valves and was wondering if they are the same that come on the l76? Would it be worth porting the factory ones or gettin a set of the L9* off a truck sorry I couldnt remember the number lol
(still gettin familiar wit this side of the world lol)
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Old 08-01-2011, 07:49 PM   #9
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The L76 doesn't have the lighter sodium filled valves, which don't make much difference unless you're gonna rev the motor above 6500 rpm. The heads on the L76 flow very well, so there's no need to replace them unless you're competing in the NHRA nationals for prize money.
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Old 08-01-2011, 09:19 PM   #10
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Quote:
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The L76 doesn't have the lighter sodium filled valves, which don't make much difference unless you're gonna rev the motor above 6500 rpm. The heads on the L76 flow very well, so there's no need to replace them unless you're competing in the NHRA nationals for prize money.
Lol ok cool. Sounds good. If I do the head work I jus wanna do everything all together so I wouldnt have to go back to do it later. But il check it all out later on. Really appreciate all the help thanks.
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Old 08-02-2011, 10:27 AM   #11
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If you're going to have the heads done have them install the hollow stem LS3 intake valves. This will help when you bump up the lift and the revs.

No need to hog out the L92/LS3 castings that come with the L76, they flow fine as-is. Get a five-angle valve job done, clean up the deck and call it a day.
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Old 08-03-2011, 09:45 PM   #12
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Quote:
Originally Posted by johnbell2 View Post
If you're going to have the heads done have them install the hollow stem LS3 intake valves. This will help when you bump up the lift and the revs.

No need to hog out the L92/LS3 castings that come with the L76, they flow fine as-is. Get a five-angle valve job done, clean up the deck and call it a day.
So getting them ported ,polished, and milled which includes the 5 angle valve job . I already got a set of 1518 springs with titanium retainers.as for the rockers are they worth swapping out? Whats the factory ratio? 1.7 ? Also about how much is good to mill 10 over jus to clean them up or 20 over to boost the compression some? Thanks again yu guys for all the help.
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Old 08-04-2011, 08:18 AM   #13
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I didn't mill mine at all. I just went with the Cometic 0.040 gasket swap - good for ~0.4-0.5 bump in static compression.

Be careful with milling these heads down too much on our cars - the piston comes out of the hole just enough to make you think twice, you have to account for that. Let's just say I wouldn't go any lower than 0.040 gaskets with the stock heads.
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Old 08-28-2011, 11:40 AM   #14
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Quote:
Originally Posted by blakss View Post
Recently got to an accident in my (ls4) impala ss and had been considering a g8 for a while so well see what happens on a few days after I hear from the insurance.
But I had recently got a set of 243 heads, ported ,milled (30 over) wit a valve job ,1518 springs,titanium retainers and ls6 valves which didnt make it on the car and was wondering if they would work on G8 GT?
Also anything I should look for when checking them out and making a purchase?
How are you guys doing? I'm based out of southern Maryland and I'm selling my silver 2009 G8 GT. I'm only selling what I own and I'm not trying to make any profit off of it. I am the 2nd owner. its has 37k on it with a full corsa cat back exhaust. I'm trying to invest my money into something a little bigger than a car right now. I own 23k on it right now but I am making monthly payment on it. Feel free to email me or call me

jtwmd83@yahoo.com

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Jovan

I have pictures....
p.s Have a Nice day
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Old 08-28-2011, 11:40 AM
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