npb4me

iTrader: (1)

I am building a 5.7l LS1 408. Is this worth doing? Or is there to much modifiying to make it worth the swap? I'm setting the motor up at 9:1 and will be putting on a D-1SC procharger on it.

Thanks.

TXsilverado

iTrader: (19)

cant turn a ls1 into a 408. start with a 6.0 block and go from there.

stock48

iTrader: (16)

I have been told you can but sleeves have to be changed$$$$ Would be better off using a LS2 block if wanting to stay aluminum.

npb4me

iTrader: (1)

Eagle Racing sells a 408 rotating assembly for the 5.7l LS1 block and they said it doesn't need to be sleeved. Guess I'll know for sure when I tear the block down tonight.

npb4me

iTrader: (1)

So I bought a new aluminum LS2 instead. Still thinking about L92 heads. Will they be a good head out of the box for a 408 supercharged LS2?

OnyxSilveradoSS

iTrader: (4)

yes. try to get your lift to .600's where they really shine.
a custom spec
a cam would be worth it IMO.

The L92's like the larger displacement.

npb4me

iTrader: (1)

My engine builder is looking for a lift of .650. We will prolly buy bare heads and instal our own valves and springs.

zippy

Those heads will work very well if you choose the right cam. Cam selection is very important with those heads.

npb4me

iTrader: (1)

What would you suggest for a cam? I want the car to have a good lope to it so it draws attention. You don't see sandrails with a hotrod sound. I am running Mahle 4.00 pistons with a -15cc dish. I am trying to get around 9.5:1 compression.

Mighty Whitey

the L92's helped pilot a friends '98 z-28 with a 370ci and an 88mm turbo to a 9.13@148mph last year. running stock valves and rockers too.

+1 for the l92's