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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 06-18-2010, 09:32 AM   #1
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Join Date: Jun 2004
Location: Long Island NY
Posts: 714
Car: 1989 Firebird Formula
Engine: 5.7L 355 TPI
Transmission: 700 R4 with TCI rebuild kit and valve body mods

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l98 stock cam specs

anybody know the lift/duration specs on the stock L98 camshaft?
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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|
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Old 06-18-2010, 09:35 AM   #2
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Join Date: Jun 2004
Location: Long Island NY
Posts: 714
Car: 1989 Firebird Formula
Engine: 5.7L 355 TPI
Transmission: 700 R4 with TCI rebuild kit and valve body mods

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Re: l98 stock cam specs

nevermind, just found this on the front page:

GM Stock Cams
Model Number .05" Duration 1.5:1 Lift 1.6:1 Lift Lobe Sep. Notes
14093643 202/207 .404/.415 .431/.443 114.5 87 350,305man
10088155 179/194 .350/.384 .373/.410 109deg 87 305 auto
10066049 207/213 .415/.430 .443/.459 117deg 88-89 350,305
10111773 202/207 .413/.428 .441/.457 114.5 90-92 350,305

although i'm not quite sure how to read it. is it saying that for 88-89 cars with a 350 came with a cam with 207 duration and 415 lift at 1.5?
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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; 06-18-2010 at 09:38 AM.
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Old 06-18-2010, 08:46 PM   #3
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Join Date: Apr 2005
Location: Not in Kansas anymore
Posts: 7,708
Car: 90 Vette / 67 Camaro / 87 Vette
Engine: 383 SP EFI /383 LT1 /L98 TPI
Transmission: T400 /200R4 /T700
Axle/Gears: 9" 3.90 /12 Bolt 4.11 /D44 3.07

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Re: l98 stock cam specs

Quote:
Originally Posted by bigchief View Post
is it saying that for 88-89 cars with a 350 came with a cam with 207 duration and 415 lift at 1.5?
Correct
Those numbers for the intake valve ; 213 / 430 are for exh valve
What they are saying is all L98 cams are pretty wimpy
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Old 06-18-2010, 08:46 PM
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