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TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.

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Old 11-22-2004, 11:04 PM   #1
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Join Date: Jun 2004
Location: Long Island NY
Posts: 710
Car: 1989 Firebird Formula
Engine: 5.7L 355 TPI
Transmission: 700 R4 with TCI rebuild kit and valve body mods

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help on estimating hp on my motor plz

5.7L 350 bored .30 over, late model block
at .050 204in 214ex, 422in 444ex valve lift cam
stock, newly machined 305 heads (about 9.75:1 compression)
Accel 24lb fuel injectors
Edelbrock high-flow base intake manifold, and runners
Edelbrock 1 5/8 primary, 2 1/2 collector headers
3" intake/exhaust high-flow cat
Edelbrock 3" cat back

how much power do you guys think i will be able to make with this setup? i know i must include a custom prom as well. also, what about that b&m shifter on summit, it says it wont fit formulas... has anyone tried this??? why wont it fit?

*any suggestions to my setup are fully welcomed, thanks a lot guys
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|88' formula fuel tank|holley 255 Lph fuel pump|slp ls1 25# fuel injectors|edelbrock shorty headers|edelbrock 3" catback|no cat|88' formula stock posi 2.73 10 bolt rear|original 700-R4 with TCI full rebuild kit|350 flat tappet iron block|original 305 iron heads|204/422 hyd/ft mellings cam|BMR adjustable pan hard rod|

Last edited by bigchief; 11-22-2004 at 11:09 PM.
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Old 11-23-2004, 12:25 AM   #2
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Join Date: Jun 2003
Location: Lombard, Illinois
Posts: 1,419
Car: 1992 Camaro RS 25'th anniversary he
Engine: 355 TPI,
Transmission: T-5
Axle/Gears: 10-bolt with 3.42

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Maybe 250 horsepower or so, You could benefit with heads. Are you running the 416 heads? Torque will be in the 300s probably.
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Old 11-23-2004, 09:42 AM   #3
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Join Date: Sep 2002
Location: Dallas/Fort-Worth
Posts: 1,497
Car: 1988 Camaro IROC-Z
Engine: 350 TPI (L98)
Transmission: T56
Axle/Gears: 9-bolt 3.45

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I would lean towards upper 200, possibly 290, but torque will be over 300. Stock torque for the 350 was already over 330 at the motor, so it should be about 340-350, but the power band should be longer.
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Old 11-23-2004, 07:41 PM   #4
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Join Date: Jun 2004
Location: Long Island NY
Posts: 710
Car: 1989 Firebird Formula
Engine: 5.7L 355 TPI
Transmission: 700 R4 with TCI rebuild kit and valve body mods

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hmm really i thought i might have been in the 300's. right now im still using the stock tpi base manifold and runners, along with the stock 19lb 305 injectors, and the cast manifolds lol so i guess im not pushing more than 220 right now?? what else do you guys suggest i do to get some more power? how much potential do these heads have? im not sure which they are, im sure they are the stock 305 heads that come with the tpi though.
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Old 11-23-2004, 07:41 PM
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