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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 03-06-2002, 02:34 PM   #1
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Join Date: Jun 2001
Location: Northern Kentucky
Posts: 726
Car: 1991 Z28
Engine: L98
Transmission: 700R4

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TPI 350 engine specs

I was wondering if anyone knows where I can find engine specs for the L98? I am planning a cam and head swap very soon, and I was wondering where I could get some info on that motor. I have some stock cam info, somebody please check this for accuracy please.....

Lift .413 INT .428 EXH
Duration 202 INT 207EXH
Lobe seperation 114.5
rocker arm ratio 116/116


I was also curious who makes the best intake runners? And finally, If I get say, Edelbrock heads, will I have to port match the intake for them to fit? Any additional info would be GREATLY appreciated. Thanks guys...


Mike Estep
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1991 Z28 L98/700R4......


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Old 03-08-2002, 11:05 AM   #2
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Join Date: Aug 2001
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Re: TPI 350 engine specs

Quote:
Originally posted by KYL98
I was wondering if anyone knows where I can find engine specs for the L98? I am planning a cam and head swap very soon, and I was wondering where I could get some info on that motor. I have some stock cam info, somebody please check this for accuracy please.....

Lift .413 INT .428 EXH
Duration 202 INT 207EXH
Lobe seperation 114.5
rocker arm ratio 116/116


I was also curious who makes the best intake runners? And finally, If I get say, Edelbrock heads, will I have to port match the intake for them to fit? Any additional info would be GREATLY appreciated. Thanks guys...


Mike Estep
Rocker arm ratio is 1.5:1 :P

SLP makes the best runners IMO because you can always go siamesed with them later. Your cam specs are close enough, a degree or two off on duration is no biggy, LSA is 114, lift is about what you said, maybe a little more.
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Old 03-08-2002, 11:05 AM
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