KingJacobo

I have a nearly stock LS1 right now in my Trans am, and am planning on eventually dropping in an iron block and stroking to 427. I want true duals, can't stand Y pipe setups.

If I get a custom true duals setup (longtubes, cats,) on my LS1, and eventually swap in an iron block, will the true duals still fit perfect, need some fab, or will I need to totally redo the exhaust?

Just trying to think long term. Wouldn't want to waste $$$ on a setup that I will redo in the future.

Blackpanther99

iTrader: (8)

Dont see why it wouldnt work.

I would wait anyhow until you go that big on cubes. Definately 3" all the way.

Midnight02

iTrader: (8)

A little off topic -- do you already have a local shop to do the work?

I'm in need of some fab work as well and would love to find a local guy that someone already has confidence in.

KingJacobo

I do not have a local shop yet, I'll honesty be doing it a few months or so down the road. PM me to stay in contact..


Would 2.5 in piping restrict ~500hp?

Blackpanther99

iTrader: (8)

Go 3" all the way since your going 427ci.

imma_stocker

iTrader: (19)

427 LQ block will need serious work. That isn't a typical stroker build. OR you will need to start with a bigger motor and send that to a machine shop.

That said, the LS family of motors are very close in size. The height of header flanges in relation to body and overall width will determine if a true dual setup will still fit "perfect" on both motors. Use 3" all the way, X or H pipe, whichever fits.

thunderstruck507

iTrader: (18)

the outside of each engine is the same so yes they will fit

3" or bust...2.5" is a waste of money and you will just have to change it to 3" later, hell even my 3" duals pick up at the track with the cutouts open

Silvy6.0

iTrader: (5)

What this guy said^^