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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 03-24-2002, 01:21 AM   #1
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Car: 1989 GTA
Engine: 383
Transmission: T56
Axle/Gears: 9bolt 3.27s

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Stock Head specs
Does anyone know the specs on stock L98 heads and LT1 heads?
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Old 03-24-2002, 03:53 AM   #2
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Car: 87 Monte Carlo SS
Engine: 89 IROC 350 TPI
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the stock cast iron heads are 64CC (Im pretty sure but not 100%) and the valves are the 1.94 intake 1.5 exhaust, the aluminum are 58cc with same valves no idea on LT1 heads
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'87 Monte Carlo SS,with '89 IROC 350,700 trans, blew up 3.73 posi stuck with crappy 2.73's neeed gears! hooker headers, flowmaster 2 1/2" exhaust true dualls, alum vette heads 58cc, 1.6 RR's and RCR's SLP runner, plenum and base all highly ported.
Look cool go fast.
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Old 03-24-2002, 08:32 PM   #3
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Thanks, is there anyone out there that might know the LT1 specs?
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Old 03-25-2002, 11:07 PM   #4
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Here is a link to a site with more information on them and other SBC heads than you can probably use.

http://www.purplesagetradingpost.com...fo/heads1.html

I believe the valves are 1.94/1.50 on an LT1.
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Old 03-25-2002, 11:13 PM   #5
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Thanks 89raptor, thats a great sight.
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Old 03-26-2002, 12:05 AM   #6
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Quote:
Originally posted by monte-ss
the stock cast iron heads are 64CC (Im pretty sure but not 100%)
Yeah they're 64cc
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Old 03-26-2002, 12:05 AM
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