dbprecision

iTrader: (2)

What is needed to put 243 heads on LS1?

What gasket is good (plan to spray n20 someday)?

Which headbolts? I have 2004 GTO but I have heard that different sizes that year

Any good valve covers that look good decent price out there?

King Nothing

iTrader: (9)

you need to get the bolts for a 04 LS and thats done. i think your valve covers should swap over from what you have on your GTO (i thought the GTO's got the 243's )

bene

iTrader: (16)

Only if they have LS2s.

Longshot LCMS

iTrader: (1)

Which were 2005+. The 04 GTO is regarded as the Bastard Child of GTOs for being the only one with the LS1

PowerShift408

iTrader: (44)

As far as head gaskets, you can either go with stock GM MLS gaskets or if you're looking to squeeze every pony out of your setup, get a set of Cometics with a .040'' compressed height.

For head bolts, you can get a set of new stock head bolts (do no reuse yours) or what I would do (especially with nitrous in your future), a set of ARP head studs. It may be overkill but that's just the way I like to do things.

Oh and your valve covers will swap over.

dbprecision

iTrader: (2)

Summary:

Gasket: stock GM MLS gaskets
Upgrade: Cometics with a .040'' compressed height (What bore size?)

http://www.thunderracing.com/catalog...mid=28&sid=439

Head bolts: stock head bolts (dont reuse bolts)
Upgrade: ARP Head Studs ARP 12-Point Head Stud Kit , 2004+ Blocks
http://www.texas-speed.com/SHOP/item...d=836&catid=36

PowerShift408

iTrader: (44)

3.910'' bore p/n 119-C5475-040 at Thunder Racing.

Nice summary, I should've just done it that way. That's what happens at about 4 in the morning. Insomnia is a ****.

dbprecision

iTrader: (2)

Thanks for the information. Actually Texas speed is cheaper on Gaskets b/c they sell as a pair and not individually.

corndogs

iTrader: (1)

oredered from texas before, great company

garygnu

were the springs stock on the 243s you were installing?