obeymybird

iTrader: (4)

ok so i have a friend and my brother building 350 tbi motors right now is vortec heads the way to go here? my friend is running with a comp cam xfi 1500-5300 cam both motors will be flat tops what kinda hp numbers you guys getting from your vortec 350s?

fisher4550

Geeez Guess no one is running a 350 tbi like im going to do.

obeymybird

iTrader: (4)

strange but true

graebz28

iTrader: (5)

Guy I sold my 903 heads to ran 400+ hp at the flywheel with a lt4 hotcam. I have some more work to do before I get my wheels on the dyno.

alvanwie

Here is the Dyno2003 estimate for my votrec TBI motor. Run great fun to drive. Has not been on a dyno or the track.

adm030

Do you think this combo would make 350 rwhp and tq I couldn't really read the graph. Are your heads 2.02 or 1.94 and what size injectors are you running? I believe you have one of the most powerful setups along with graebz28

alvanwie

No, the simulations say about 400hp at the flywheel (430 lb-ft torque), so probably around 320rwhp or slightly less.
Stock 1.94/1.50 valves. 80 lb injectors at 18 psi.

adm030

Well you should be able to run a high 12 with that combo. I've been trying to come up with a 350 or more rwhp combo using the vortec style heads. I'm thinking that with ported vortecs, eq vortecs, or patriot vortecs it could be possible with the same cam your running, is there any reason you didn't go with an rpm intake like professional products or edelbrock. lmk what you think I was thinking also using one of the 750 cfm tbis also with the 80pph injectors.

Goodluck with the builds obeymybird didn't mean to ask so many questions on your thread but maybe they will give yall some help building those.

alvanwie

The reason for the GMPP intake was because this car has to pass emissions test. At the time I wanted to have EGR available in case I needed it. I felt this was the best manifold with EGR available. Also I wanted a spreadbore to run the 454 adaptor to the tbi because I felt it has better flow than a simple plate.

As it turns out I have been able to pass smog test without EGR, don't need it with this much cam overlap.

I think 350rwhp with vortec tbi would be difficult but not impossible with stock vortecs. As far as aftermarket vortecs, I think if I was spending the extra money anyway, then I would step up to AFR or Trickflow.