I haven't the foggiest idea of what my car will end up having for a motor. To start tho, I do know I want to get rid of the 305.

A lot of these crate motors, like the 330hp 350HO deluxe and the ZZ4 claim hp numbers with carbs.

What kind of hp numbers could I expect with still keeping my TPI? Until I get an HSR, TPI with 350 injectors is gonna have to do the job.

Any ideas?

 

The max factory rating for a TPI 350 was 245.

When Scoogin-Dickey put their Vortec TPI base on a 350HO, it put out around 280 HP. However, that's flywheel gross, as is the "330 HP" rating, with headers, facility-powered electric water pump, velocity stack-type intake, etc.; and the 245 above is flywheel net, with alternator and water pump being powered by the engine, all controls operating and the intake & exhaust hooked up to the engine as if it was in a car - meaning the 350 HO TPI didn't make any more power than the factory L98.

In order to get the 358 HP they advertise for their Vortec TPI crate engine, they needed LT4 Hot Cam, 1.6:1 roller rockers, and valve spring upgrades. That, however, is still flywheel gross HP.

You can make decent power out of TPI w/o going to HSR. Bud who used to live here took a ZZ3, had the heads CNC ported, Big Mouth Vette base & runners, all port matched & extrude honed, ZZ9 cam w/1.6:1 rockers, that ran his '90 RS at 100 mph through the quarter up a this altitude - that's a 3700 lb car going through the traps at 107 mph at sea level, through factory exhaust manifolds and dual cats (he breezed through emissions testing). I haven't done the calculations, but that has to be well over 300 RWHP.

 

So as far as a crate motor, I'm not going to see anywhere near the hp figures that they are stating? Hmmm... For the cost of a crate, would it just be easier to have a motor built?

 

Your not going to make any significant power with TPI. TPI is not a performance intake, it is made for efficiency and gas mileage. The T stands for tuned, tuned to give the illusion of power. That is why it stops at 4000rpm.