hp estimate Please!!!!!!!
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Junior Member
Joined: Mar 2004
Posts: 14
Likes: 0
From: Virginia
Car: 1989 camaro rs
Engine: 305 TBI
Transmission: automatic
hp estimate Please!!!!!!!
with the setup gong in my 89, i want to know what sort of power will be puttin out
350 bored 0.030 over
10.5:1 compression
vortec heads
.525 int. exh rollercam
1 7/8 inch long tube headers
edlebrock tunnel ram intake
2- 400 cfm 4 barrel carbs
MSD distributor
MSD Blaster coil
MSD Wires
bosch 4 plugs
around what should i be expecting
350 bored 0.030 over
10.5:1 compression
vortec heads
.525 int. exh rollercam
1 7/8 inch long tube headers
edlebrock tunnel ram intake
2- 400 cfm 4 barrel carbs
MSD distributor
MSD Blaster coil
MSD Wires
bosch 4 plugs
around what should i be expecting
Last edited by 89-305; Apr 20, 2004 at 07:52 PM.
Joined: Mar 2000
Posts: 43,187
Likes: 45
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
Need more data on the cam.
Unless that cam has about 250 degrees duration @ .050", you're going to have about a 1000 RPM powerband.
Unless that cam has about 250 degrees duration @ .050", you're going to have about a 1000 RPM powerband.
Supreme Member
Joined: Jul 1999
Posts: 18,457
Likes: 16
From: Loveland, OH, US
Car: 4
Engine: 6
Transmission: 5
If that's the LT4 HOT cam, you'll get alot more useful power and speed out of a single 750 carb and a Perf RPM, with a whole lot less trouble and gasoline expense if you drive it on the street.
Also, I'd hate to even think about putting 1-7/8" headers on a SBC with the stock flange. AFAIK they'd about have to be a Stahl flange, or they'd have to be severely dimpled around the bolts. For a 350 with a 220 degree cam like that one, you don't need that sort of thing. 1-3/4" ones will work just fine, in fact might even make the car faster than the larger ones.
The ignition stuff is irrelevant. Don't bother including it in your HP estimate. You could stick a stock HEI and regular AC plugs on there and get the same results, if it all works right and has the right timing curve for the rest of the motor.
With the combo I gave you, you should get about 400-420 HP peak, with a good wide torque band, within 10-15% from about 2500 to about 5000 RPM. With the tunnel ram, you'll have no torque at all below 3500 RPM or so, and about the same peak HP. I'd guess it would probably give up .4 in the 1320 compared to the RPM.
Also, I'd hate to even think about putting 1-7/8" headers on a SBC with the stock flange. AFAIK they'd about have to be a Stahl flange, or they'd have to be severely dimpled around the bolts. For a 350 with a 220 degree cam like that one, you don't need that sort of thing. 1-3/4" ones will work just fine, in fact might even make the car faster than the larger ones.
The ignition stuff is irrelevant. Don't bother including it in your HP estimate. You could stick a stock HEI and regular AC plugs on there and get the same results, if it all works right and has the right timing curve for the rest of the motor.
With the combo I gave you, you should get about 400-420 HP peak, with a good wide torque band, within 10-15% from about 2500 to about 5000 RPM. With the tunnel ram, you'll have no torque at all below 3500 RPM or so, and about the same peak HP. I'd guess it would probably give up .4 in the 1320 compared to the RPM.
Supreme Member
Joined: Jun 2003
Posts: 1,521
Likes: 0
From: Cypress,Tx
Car: 89 Camaro RS
Engine: 350 carbed now
Transmission: World Class T5
Axle/Gears: Peg Leg w/ 3.73's
Originally posted by RB83L69
If that's the LT4 HOT cam, you'll get alot more useful power and speed out of a single 750 carb and a Perf RPM, with a whole lot less trouble and gasoline expense if you drive it on the street.
Also, I'd hate to even think about putting 1-7/8" headers on a SBC with the stock flange. AFAIK they'd about have to be a Stahl flange, or they'd have to be severely dimpled around the bolts. For a 350 with a 220 degree cam like that one, you don't need that sort of thing. 1-3/4" ones will work just fine, in fact might even make the car faster than the larger ones.
The ignition stuff is irrelevant. Don't bother including it in your HP estimate. You could stick a stock HEI and regular AC plugs on there and get the same results, if it all works right and has the right timing curve for the rest of the motor.
With the combo I gave you, you should get about 400-420 HP peak, with a good wide torque band, within 10-15% from about 2500 to about 5000 RPM. With the tunnel ram, you'll have no torque at all below 3500 RPM or so, and about the same peak HP. I'd guess it would probably give up .4 in the 1320 compared to the RPM.
If that's the LT4 HOT cam, you'll get alot more useful power and speed out of a single 750 carb and a Perf RPM, with a whole lot less trouble and gasoline expense if you drive it on the street.
Also, I'd hate to even think about putting 1-7/8" headers on a SBC with the stock flange. AFAIK they'd about have to be a Stahl flange, or they'd have to be severely dimpled around the bolts. For a 350 with a 220 degree cam like that one, you don't need that sort of thing. 1-3/4" ones will work just fine, in fact might even make the car faster than the larger ones.
The ignition stuff is irrelevant. Don't bother including it in your HP estimate. You could stick a stock HEI and regular AC plugs on there and get the same results, if it all works right and has the right timing curve for the rest of the motor.
With the combo I gave you, you should get about 400-420 HP peak, with a good wide torque band, within 10-15% from about 2500 to about 5000 RPM. With the tunnel ram, you'll have no torque at all below 3500 RPM or so, and about the same peak HP. I'd guess it would probably give up .4 in the 1320 compared to the RPM.
Senior Member
Joined: Sep 2003
Posts: 784
Likes: 1
From: New Mexico
Car: 1991 Camaro Z28 5.7 G92
Engine: L98 Tuned Port Injection
Transmission: TH700R4
Axle/Gears: 3.23 Posi G80
Yes don't go tunnel ram. Those are for motors turning like 8500 or more rpm. I have about 350-375 RWHP, who really knows and who cares, getting it to the ground is what counts. I don't really know what the numbers are on my setup, except the track numbers. See below... PM me if you have any questions on my setup I will be happy to tell you about it.
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TGO Supporter
Joined: Oct 2002
Posts: 9,067
Likes: 1
From: Saskatoon, SK, Canada
Car: '83 Z28, '07 Charger SRT8
Engine: 454ci, 6.1 Hemi
Transmission: TH350, A5
Axle/Gears: 2.73 posi, 3.06 posi
Huh? Last time I checked, there was no tunnel ram that worked with Vortec heads! 
Better be sure, if you do want to try that. Vortec heads are different from standard SBC heads.
Better be sure, if you do want to try that. Vortec heads are different from standard SBC heads.
Senior Member
Joined: Jan 2001
Posts: 970
Likes: 0
Originally posted by Air_Adam
Huh? Last time I checked, there was no tunnel ram that worked with Vortec heads!
Better be sure, if you do want to try that. Vortec heads are different from standard SBC heads.
Huh? Last time I checked, there was no tunnel ram that worked with Vortec heads!
Better be sure, if you do want to try that. Vortec heads are different from standard SBC heads.
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