The 4.5L is significantly less than 21k per engine and will easily make 1200hp on a 598ci. We sale 4.5L complete kits with a retail of $16,500 per motor that has every sensor, computer, wire, pump, injector, relays, iac's, tune, dist, coil, belt system, MOAC intercooler and logs, manifold, linkage, SC, fuel fitler/head, fittings.....

For a 598ci, with a roots, you would need a 1471, you should run a billet housing, billet rotor, non-teflon, high helix, front discharge and you'll be close to 1000hp on pump gas. But after you cut the hatch, by the carbs, pumps, reg, ignition, belt system.....

But look at resale, the days of the big belt system, carbs or EFI with carb look, giant scoops are the past. You can make all that power, plus more, under the hatch, with fuel psi, oil psi, oil temp, coolant temp and knock sensing that gets good MPG (for a boat lol) that doesn't need restripped or rebuilt every 3 years, idle at 800rpm with option shift interupt.... Truly no comparison.

I'm not sure this is really true. No other SC company offers complete packages or supporting tunes. Almost none of them offer support on the combo's or the extra parts needed to complete the project.

PSI's really are not for most. They have HORRIBLE distribution, they do not idle without a lot of work. There only good if you know how to set one up, there extremely hard on belts if your making some power, there hard on crank shafts (if you don't have a bryant or similar). If you don't get the right housing/rotor combo, then they are not very good at all. Also, they have 6-9 month lead times, how is the warranty/service after that lead time?

Roots are the cheapest option and do well when the motor is built around the SC. High compression, low boost, big carbs or billet throttle bodies. Proper size sc for engine. But they don't idle well, horrible on fuel economy because so much fuel evaporates while it takes heat away going through the rotors, are extremely tall, belts are typically very loud, most wear and need to be rebuilt.

Dont make power, what are u smoking

i was being sarcastic,i have 8.3L whipples on one of my boats,and love them.

Thank you for the info Dustin. I was just posting the numbers that I was quoted from a west coast dealer at the miami boat show . And yes I agree the EFI whipple set up is a much more efficient set up than a root's deal . When the time is right I will call you .

Jason 3603 Do yourself a favor and buy a 1071 or 1471 from The Blower Shop for around $5500 and have fun. Don't let Whipple charged or anyone else
try to sell you a Whipple you do not want and cannot afford.

Jason, look into Scorpion racing in Livonia. Not far from you and does great work. They have an outstanding resume and their shop is impeccable. Contact Frank McCommas.

The 12-71 is the perfect fit, takes less hp to run and can still make up to 1300 hp

Good Thread Going Here..........

A high helix 10:71 with the triangulated type discharge might be a good choice. Bds, littlfield, Tbs...all good choices. You might have to be careful on manifolds due to distributor clearance. What compression are you running and do you plan on running a chiller?