What do ya think of this combo?
Thread Starter
Joined: Sep 2003
Posts: 93
Likes: 1
From: Warren, Oh
Car: 89 IROC
Engine: 355
Transmission: 5 sp., Alum Driveshaft
Axle/Gears: 3.73 Posi
What do ya think of this combo?
I'm going to build up an 89 355 tpi and here's what I'm looking to do.
355 cu. in.
Large tube runners
Scoggins/Dickey Vortec hi flow tpi intake
52 mm bbk tb
lt4 hot cam
26 lb. ford injectors
1.6 gm roller lifters
hooker headers
GM fast burn heads
ported plenum
t5 trans (for now)
3.73 posi
what do ya'll think of this set up and what kind of numbers are we
looking at (ballpark)
any suggestions are welcome.
355 cu. in.
Large tube runners
Scoggins/Dickey Vortec hi flow tpi intake
52 mm bbk tb
lt4 hot cam
26 lb. ford injectors
1.6 gm roller lifters
hooker headers
GM fast burn heads
ported plenum
t5 trans (for now)
3.73 posi
what do ya'll think of this set up and what kind of numbers are we
looking at (ballpark)
any suggestions are welcome.
Last edited by 8996chevy; Dec 10, 2008 at 07:37 PM. Reason: left out some things
Thread Starter
Joined: Sep 2003
Posts: 93
Likes: 1
From: Warren, Oh
Car: 89 IROC
Engine: 355
Transmission: 5 sp., Alum Driveshaft
Axle/Gears: 3.73 Posi
Re: What do ya think of this combo?
sorry 'bout that. my post got posted before i was done. i hit the wrong key
Last edited by 8996chevy; Dec 10, 2008 at 07:38 PM.
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
That's basically their Vortec TPI crate engine with better heads.
If you're putting it together yourself, use the Stealth Ram instead of the base & runners.
If you're putting it together yourself, use the Stealth Ram instead of the base & runners.
On Probation
Joined: Oct 2008
Posts: 6,319
Likes: 19
From: Northern Utah
Car: seeking '90.5-'92 'bird hardtop
Engine: several
Transmission: none
Axle/Gears: none
Re: What do ya think of this combo?
Those heads aren't better. just a too-large intake port that actually flows less up to 0.500", and aluminum. I'd say if you want to play it this way, go with either Edelbrock ETEC 170s or AFR 180s.
Joined: Jul 1999
Posts: 10,950
Likes: 26
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: What do ya think of this combo?
You'll need to do some custom chip tuning to get the computer happier with the camshaft.
Once you do that, I'd predict 310-320 RWHP, same as that combo made in my car, but I had L98 Corvette heads. See the thread at the top of the TPI forum called "Quest for a better flowing TPI" and you'll see the tricks we did to the intake manifold to get the horsepower higher than that.
Once you do that, I'd predict 310-320 RWHP, same as that combo made in my car, but I had L98 Corvette heads. See the thread at the top of the TPI forum called "Quest for a better flowing TPI" and you'll see the tricks we did to the intake manifold to get the horsepower higher than that.
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