is there a way to get 300hp from a tbi
03-11-2006, 05:04 PM
#2
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Car: 1992 Trans/am convertible
Engine: 305 TPI
Transmission: 700r4
Axle/Gears: 2.73 drum WS6
Yup.
I know a guy pulling 315hp crank with a 305tbi.
But, most people here will tell you that its not possible.
So, dont get too discouraged.
Tunning, port and and valve job, full exhaust, 3:23 or 3.42 gears will get you decent performance. Dont need to bore it necesseraly.
(If you wanna get cocky, 125 shot will do the trick)
I know a guy pulling 315hp crank with a 305tbi.
But, most people here will tell you that its not possible.
So, dont get too discouraged.
Tunning, port and and valve job, full exhaust, 3:23 or 3.42 gears will get you decent performance. Dont need to bore it necesseraly.
(If you wanna get cocky, 125 shot will do the trick)
03-13-2006, 06:47 AM
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Originally posted by iroc22
You'll need to dump the 187 casting heads for any reasonable power level.
You'll need to dump the 187 casting heads for any reasonable power level.
03-13-2006, 07:24 AM
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Car: 93 GM300 platforms
Engine: LO3, LO5
Transmission: MD8 x2
Originally posted by iroc22
You'll need to dump the 187 casting heads for any reasonable power level.
You'll need to dump the 187 casting heads for any reasonable power level.
Lo-tec ran 13.6 with a 193 casting Caddy LO5 engine that also had the cam swap + exhaust.
Reasonable power can be made with stock castings. More power can be made with ported heads.
03-13-2006, 08:49 AM
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Car: 84' Monte
Engine: 350
Transmission: 700-r4
Axle/Gears: ferd 9" posi 3.50 gears
The heads would be pretty far down on my list of mods too. Way after exhaust, cam, intake, and getting a 350.
Whats up with the influx of tuned port guys lately?
Whats up with the influx of tuned port guys lately?
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03-13-2006, 04:48 PM
#9
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Originally posted by kdrolt
Dewey316 made 208 rwhp with stock 187 castings, cam swap, and exhaust on a 305, and ran 14.5.
Lo-tec ran 13.6 with a 193 casting Caddy LO5 engine that also had the cam swap + exhaust.
Reasonable power can be made with stock castings. More power can be made with ported heads.
Dewey316 made 208 rwhp with stock 187 castings, cam swap, and exhaust on a 305, and ran 14.5.
Lo-tec ran 13.6 with a 193 casting Caddy LO5 engine that also had the cam swap + exhaust.
Reasonable power can be made with stock castings. More power can be made with ported heads.
Using a 350 is obviously going to get you closer to a 300hp goal. Anything beyond that will need new heads.
I dicked around with 187's before when I had a TBI car, I didnt get very far with those heads, ended up swapping for S/R 305 Torquers.
03-13-2006, 05:00 PM
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Car: 1990 Camaro RS
Engine: Juiced 5.0 TBI - 300rwhp
Transmission: T5
Axle/Gears: 3.42 Eaton Posi, 10 Bolt
I know it is. But I was just shy of 240rwhp with the 416 heads, and the same cam. at 12% loss that is about 270 hp. Its getting closer to the 300hp mark, and I really don't have much money tied up in this, it is a pretty easy buildup.
03-25-2006, 10:08 PM
#12
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I was making 275 RWHP before bumping FP and EBL. Thats a stock short block 350 Xfire.
03-26-2006, 12:18 AM
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Car: Camaro Convertible RS
Engine: 355 TBI
Transmission: 700R4
What kind of heads should I slap on my built 355 short block? I'm really don't have any idea what combo would work best with it.
03-27-2006, 11:07 PM
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Car: A Camaro
Engine: Weak
Transmission: Weaker
Originally Posted by Dewey316
I know it is. But I was just shy of 240rwhp with the 416 heads, and the same cam. at 12% loss that is about 270 hp. Its getting closer to the 300hp mark, and I really don't have much money tied up in this, it is a pretty easy buildup.
03-28-2006, 09:20 AM
#15
big flow heads may not be best for street driven application. especially TBI. cheap heads may cause other issues. i happen to have a professional engine builder as an aquaintance/business relationship. the latest heads coming from Edelbrock(cnc) are perfection. in his humble opinion having set up more than a couple engines. he is a total frame off restoration specialist. now again not the highest flow(rpm) but good velocity which means easier to tune.
chev vortec is another lower cost alternative.
chev vortec is another lower cost alternative.
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