What I am for sure going to run:
6.0L heads mildly ported
stock 6.098 rods with ARP bolts
2.75 pulley on the radix
3.905 bore, ok maybe 4.000 but we will see.

Unsure about either a stock 3.62 crank or a 4.100.
Basically 346ci or 393ci
About 12lbs boost or about 8lbs boost ~ give or take.

I think the more cubes with less boost will make more power anyways but will cost $800 more.

 

go with the 391. OR get a 408 like i'm doing.

 

No replacement for displacement.

 

less boost on more cubes=less heat=more power. I vote 391.
I guess you could look at it like this:

8 cylinders @ 12 pounds (each cylinder being 43.25)

or

9 cylinders @ 8 pounds (each cylinder being 43.44)

 

I say the bigger motor. For one you will be putting less strain on the motor and making the same or more power plus if you lator on decided to get say a turbo or turbos you would have a good motor with a lot of torque. If you put the 4.100" stroke crank with the radix your going to have some awesome torque off the line

 

Are you going with an aluminum or a CI block?I don't think I would try to bore the 4.8 block to 3.905 and add a stroker crank.If you are going with a different block a LS2 block or a 6.0CI block with the 4.10 stroke would give like 412 CID or more depening on overbore.

 

It will be a 4.8/5.3 block. I feel that it will bore just fine to 3.905 if not to 4.000. The couple of blocks I have measured have at the very least I could find a .260 wall thickness. Boring from 3.780 to 4.000 would take off .110 per side which would leave .150 wall. I have seen engines run on as little as .060 wall. There are always variables and for that reason I am considering the 3.905 bore just to be conservative since this is not a *****-to-the-wall motor. The other reason for the 3.905 bore is the better choice of off the shelf pistons which would cost less and could get it back together more quickly. Thanks for your input. I'm leaning torwards the 4.100 crank myself.

 

I would say go with the 391ci. It would be nice bc it is would be the only one out there (that I know of). But how much can that Radix flow?? You just want to make sure that it doesnt besome restrictive.

 

Just rechecked my math and it would actually be a 393 ci w/ 4.100 stroke and 3.905 bore. The 4.100 will require a custom piston, the 4.000 stroke would not.

 

Go for cubes man knowing you will not be happy unless you have the big motor