In a year or two I'm gonna get a single cab with a 4.8. I want to buy a brand new 6.0 from my dealer. I want to stroke it, get high strength pistons & connecting rods, Ported/polished heads-with bigger valves, 212/218 or 208/216 cam (or some other cam that doesn't take away from the low end), & a Radix Supercharger w/ 12-14lbs. of boost.

A few Questions:

Would this set-up work well if I get custom tuning?

Would there be any problems w/ boost, like loosing any w/ more cubic in. ?

What sould I stroke it to? 408, 427, etc. (I'm thinking 408)

Does more cubes give alot of torque, horsepower, or both?

What kind of pistons would I need?
How much money would that take to build the 6.0 up?

With Eaton 4.10s, High performance tranny, 2200-2600 stall, Long tubes, true duals w/ 3in piping, and slicks, what do you think it would run? I

Sorry for such a long post! Thanks in advance

 

as far as a cam taking away from the low end....on a motoro as big as you are talking about you wouldn't have to worry about losing 10-15 hp at the low end cuz it would be making so much to begin with. bigger motors tend to make a ton of torque, atleast big blocks that i've seen. i would honestly go with a little bigger cam, a radix and a bigger stall and you'd have a great combo. i'm going to finish up my 6.0 and then start building an aluminum stroker motor, probably a 396-408, something in that area with boost.

 

i would love to do something like you are talking about but i dont think the radix would feed a bigger motor with high boost. might have to go with a turbo set up for high boost. here are some whipple numbers that i saw and i think the whipple compresor is bigger than the radix.

max rpm recomended by whipple is 13000rpm. the smallest pully i tried put it at 14300rpm, with that pully i saw 11psi on a STOCK 6.0. put that on a 408 or bigger and you might only get to 8psi. there is a compresor map somewhere for the whipple and it only goes to 14000rpm so i dont think spining it faster is the answer.

anyone know the compresor size for the radix or know of a compresor map? the whipple is a 2.3L.

 

i am thinking about a D1-SC sometime late this year....it'll feed a forged internal heads cam 6.0 pretty well i'm sure. hell, Stupidfast made 400hp with a small cam, stock heads and 8 psi, so with a bigger cam, good heads, and the same boost i would probably be happy, and i could always spray it if i wasn't.

 

Parish is correct. A SC the size of a Radix would not feed the 6.0L well at that high of boost. It would be spinning so fast that it is creating more heat than producing useable boost. You could go with something like the Whipple 3.3L twin screw (like they use on the 8.1L setups - intercooled too) or you could find a centrifugal blower like Matt was saying.
Either way though, you might end up maxing out the MAF flow tables, in which case tuning is a must. It seems that people who run into this problem of max MAF readings go back to using nitrous or buy some computer setup that costs anywhere from $1400 (for a "piggyback" unit for the existing PCM that functions similar to FAST. This would be good too b/c you could still pass emissions) or they go with a $2100 FAST setup. If you are willing to do that, why not just spend a grand more and buy a MoTec computer system and have onboard telemetry too J/K Good Luck. Ryan

 

Thanks for the info guys. What if I was to just get a 6.0 H.O. (345hp) & just throw a cam in it & have some headwork done.

How much boost could I run?

Would I have to change out the pistons or whatever to run the max amount of boost?

Would true duals w/ 3" straight-through mufflers be good?

When you get a cam w/ a supercharger which one would be better, 212/212 or 212/218?

 

as far as exhaust your plans are fine and will work great with either of the motor combos you have in mind.

for a cam on a boosted or nitrous motor i would go with atleast a 4split. such as 220/226 or 220/224 etc, i'm gonna be running a single pattern cam with my nitrous motor but it should be fine. when i decide to go to boost i'll probably go with something like a 224/230 cam.

 

whipple told me the compresor is the same for all truck aplications. the 2.3L unit and they couldn't understand how i was maxing it out on a 6.0. that just shows you how well these motors flow when you can max out a blower that is designed to fit on a 8.1L motor.

 

The Radix flows better than you give it credit for!

 

I think a Radix would be able to make 10lb of boost with a 408,where I would be concerned with boost falling off would be at over 5500rpm on a 408.The Problem is going to be with the rest of the drivetrain because with a 408 cammed to peak at 6000rpm you will make about 650lb/ft of torque at 4000rpm at the rear wheels.Your boost would probably fall to 8lb by 6000rpm and revving higher would be useless.