Hey guys I got a 408 stroker with 9.7:1 compression, ported ls3 heads, tsp stage 3 supercharger cam, stock truck intake manifold and long tube headers. I have a f1a-94 procharger for it and am curious about estimates on what size pulley will make around 10psi? I'm shooting for the 750ish rwhp range. They said the motor would be 575-590hp at the flywheel. It's going in a 2012 Silverado 1500 4x4. I'm just going to run a single Walbro 450 pump and dual m10 meth nozzles so I don't want to be running out of fuel with too much boost. Thanks guys!

 

The biggest pulley you can get. What are the specs for that cam? Sounds like an off the shelf cam and is probably way too small.

 

are you going with an overdrive crank pulley? 8 rib set up?

 

Cam specs are 231/239 duration .641/.629 lift and a 115 lsa. And it's a the procharger stage 2 kit so it's a direct drive 8 rib. Seperate belt just for the charger that bolts to the front of my ati balancer. I just wanna run low boost at first and see how my fuel is then go up from there. Eventually will get an intake manifold either the Holley high rise or fast with new rails and go to return fuel system with an lines and a 2nd 450 pump.

 

What kind of boost do you think a 4.0" blower pulley will make on that? I feel that'll make some good power but I don't wanna over do it and run out of fuel right away and have to do my fuel system now too. Trucks been apart for 2 months and I just wanna get it together and drive it!

 

start with a 5.25" pulley and limit your rpm, that's the only way your going to be able to keep it around 10psi. The f1c-94 makes most of its power above 6,000rpm, personally if this is a street truck you probably should of gone with an f1d.

 

It's an f1a-94 which I was told is great for the street. It wil be getting more boost down the road my motor is built for 1500hp I just want to keep it safe so I know my fuel will be fine till I do my fuel system. Thanks

 

The new blowers are softer down low by more than 50hp and Tq, but make a lot more power from 6,000rpm on up than the older style. So it really depends on what your idea of street friendly is and where you want your power band.

I would still stay conservative and start with the largest pulley you can get, you'll probably run out of fuel around 700rwhp with that pump, although with a return less setup you might be able to get a little more out of it. I'm not a fan of the cam it's too small to really take advantage of that blower, let alone supply enough air for that 408.

 

What would you think if I'd stick with the 4.0" pulley and just do twin 450's in the tank one like stock and one on a Hobbs and go to return fuel? Would that be enough fuel for awhile? And not dry up the bucket?

 

That would probably be ok even on e85, just try to keep it above a 1/4 tank. You'll be spinning that blower pretty good with a 4" pulley.