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Stock Pistons in 89 IROC 350 tpi ?forged?

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Old Jun 19, 2002 | 08:47 PM
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StockBastard's Avatar
StockBastard
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From: Springfield MO
Stock Pistons in 89 IROC 350 tpi ?forged?
I've been told that the stock pistons in the L98 350 5.7 tpi are forged. Is this true?
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Old Jun 19, 2002 | 09:15 PM
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89 Iroc Z
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From: Costal Alabama
Car: 1989 Iroc-Z
Engine: 350, ZZ4 equivalent
Transmission: Pro-Built Road Race 700R4
Axle/Gears: 3.23 Dana 44
no, not at all
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Old Jun 20, 2002 | 05:06 PM
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JoelOl75
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From: PA
Car: 88 Firebird WS6
Engine: 350 TPI
Transmission: T56
Axle/Gears: 3.42
They arn't bad pistons at all though. They are hypereutectic so they are fairly strong (Stronger than plain cast)

Not as good as an aftermarket t-6 18% silicon hyper though...
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Old Jun 20, 2002 | 06:22 PM
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mystikkal_69
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From: San Antonio, TX
Car: 1988 IROC-Z
Engine: L98 (350 TPI)
Transmission: MD8 (700 R4) + 3.42 LS1 Rear
are they really hypereutetic??? i thought they were cast?
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Old Jun 20, 2002 | 06:24 PM
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8Mike9
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From: Oakdale, Ca
Car: 89 IrocZ
Engine: L98-ish
Transmission: 700R4
I think '90+ got hpyer pistons, '89 are cast Al., IIRC
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