427ci turbo suggestions

[Ddridan]

Hi guys, I'm currently in the process of building a low compression 427ci for my VZ Clubsport and wanted a few tips on turbo set up. I'm not chasing 1200hp, but would like to see 600-700 through a TH400.
I recently had a look at a kit that used 1-1/2" steam pipe headers with 4-1 merger and 2.5" crossover kit was made to suit a GT42. My question is would the pipe work be too restrictive for the 427 and would the turbo be too small to hold boost for decent rpm range?
Cheers guys.

 

[Munz]

Define decent rpm range?

probably better to ask garrett/engine builder unless you know how to read compressor maps

 

[Bigfella237]

Not sure on the turbo setup but if it was NA I'd think 1-1/2" ID primaries is a bit on the small side for 427ci?

On an LS7 (same capacity) I'd be looking for 1-7/8" primaries.

Put it this way, if you're buying a kit anyway I bet there's bugger all difference in price for bigger pipe, and basically the same labour to weld 'em up, so why not go bigger?

 

[Jake145]

Because your not chasing every single horse possible it shouldn't really matter the size but if you were to chase 1200 or so 1-7/8 is a good choice I beleive