I figure, since ive been asking questions about it i might tell about my 408 build:

Texas Speed unassembled 6 liter block 408 iron short block assembly
-4.030" bore
-4.00"Eagle Forged Crank
-6.125" Eagle Rods
-Diamond 15cc dished pistons
-ARP rod bolts
-Durabond cam bearings
-Clevite rod and crank bearings
-.027" gapped rings by me
-TSP 224R cam
-Cometic MLS Head Gaskets
-LS7 lifters and trays
-7.4" TSP hardened pushrods
-Scoggin Dickey ported L92's with L92 rocker arms
-Ported LS6 oil pump
-Crane double roller timing set
-L92 water pump
-NGK .050 spark plugs
-L76 manifold with stock injectors and Fast 90mm throttle body
-K&N cai
I also had to get the relocation bracket for the idler pulley. Im getting fuel to it by a walbro 255lph fuel pump and an Aeromotive A1000 fuel regulator. The rest is just being transfered over from the 5.3. I also changed to pacesetter lts, a 4l80E with a 3200 stall fuddle converter, and the t-case input shaft gear change. Anyway, sorry for talking so much, heres the pics so far:
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Sorry for so many pics.

 

What's the compression work out to be with them thar heads?

 

nice man! its gona be a beast!

 

compression should be somewhere around 9.5:1.

 

where did you get the relocation bracket and what was the reason for the intake choice? I have been thinking about the ls6 intake but I have been out of the loop for a little while and have not kept up with the new gm items.

 

to maybe answer my own question is it the 90mm tb? do they flow that much better?

 

nice build man!

 

I got the relocation bracket from speartech. The reason I went with the L76 manifold is because it is the only manifold that can be used with the l92 heads. The intake port design is different than any other and no aftermarket company has come out with a performance manifold yet so i didn't have a choice. For your set up an LS6 intake would work great, but even better would be a Fast 90mm. Yes the 90mm tb's do flow better than the stockers, but only show a gain if they are really needed. They only show gains on high performance, big, and FI motors due to the fact that they flow more air and faster. So on your set up, you would probably benefit from a fast 90mm intake an tb seeing that it is a 6.0 and has a bigger cam and ported heads.

 

I'll be interested in seeing what kinda power it puts down with that 224 cam.