EaglesZ28

I'm on the hunt for my new fbody car... and I am down to the last two. I've found one really clean TBI (305/standard) car, and another ULTRA clean TPI (350/auto) car. I do plan to build a healthy 406 (lets shoot for 500RWHP) and I need to know if which induction is better for this need?

I'm leaning to the TPI car... but I LOVE the idea of having a 5spd, and would take the TBI because of that alone if needed. Also, how much power can the 5spd handle before its going to give up?

I guess either way I look at it, the trans in either car (T5 or 700R4) will need work in order to handle 500RWHP, right?

Thanks guys.

Stekman

500whp is upwards of 625hp off the crank, NA to boot. Just in case you don't know that.

Just have to ask, you mean a TBI as in the TBI that comes on the 305? And a TPI that has the LTR design, right? You are asking which can support 625 crank hp?

If that is what you are asking, I have to take this time to laugh....Thanks, I needed that one.

On a more serious note, what is your budget.

fireturd350

iTrader: (8)

500RWHP is gonna cost a little money to get.

Well yeah, I know a OEM 700-r4 won't hold the 500 RWHP. Most new racing 700-r4s only give you a warranty up to 550 hp at the flywheel.

500RWHP will be out of the reach of both intake systems. The TPI was made to run on a 305 originally. They have great tq response but seriously lack the air need'd and rpms to make that kind of power. Even the TBI won't be anywhere close for the 406. So you'll be looking at a 400 block build up and then you got to decide if you want to go Fuel injection if thats the case maybe a TPIS MiniRam, LT1 modified intake, or a StealthRam (plenty of research on that stuff on the board). If you want carb, then you have a crap load of options with different intakes, spacers, and carbs.

EaglesZ28

I'm looking at a soggin-dicky vortec lower plenum, mated to some larger runners, and then a 58mm TB. I'd probably get the vortec heads bumped up to 2.02 valves as well along with porting and polishing. 500HP at the flywheel would be acceptible too as long as the chassis can put that power on the GROUND.

-Dan

fireturd350

iTrader: (8)

Whole thing is the bolt on stuff helps out a little bit, but I don't think it will be enough to get the power you're looking for. The main downfall of a TPI is the length the air has to travel from the TB to the heads. That's why lots of members have started looking into LT1 conversion intakes.

Stekman

You can use Vortec heads, sure. Don't be suprised when you fall short of even 500 crank.

But sure, here it goes:

Brodix 18x heads
18° Brodix intake
Fully forged bottom end
18° forged pistons @ 10.5 compression
Full solid roller valve train ~250/260 @ .050 duration with .600's for lift, tool room valve springs, titanium retainers and locks, etc
Custom 1 7/8" headers
The power band will start at about 4000 rpm and go to maybe 8000.

A full race prepped transmission will be required, no street/strip tranny
A ford 9" rear would take it, as would a Moser or Dana.

That will get you upwards of 600 crank hp. But you better have deep pockets as the heads alone cost $2,000 (no, I'm not rounding). The intake, probably another $500. Add another $1000-2000 for a GOOD solid roller valve train (I have an Isky, and....it's not cheap). Now add the 4340 bottom end with 18° race pistons. Perhaps now you see why you pay to go fast.