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exhaust port size?

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Old May 11, 2005 | 07:14 PM
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extreme 1
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From: st catharines ontario
Car: 1989 gta
Engine: 350 tpi
Transmission: 700 r4
exhaust port size?
Does anyone know what the stock exhaust port size is on a 89 L98 head?
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Old May 15, 2005 | 02:04 PM
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Are you inquiring about exhaust port dimensions at the flange, or the port volume? The dimensions vary slightly from casting to casting, as do the port volumes, however, there is a design standard for both.
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Old May 16, 2005 | 03:15 PM
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From: st catharines ontario
Car: 1989 gta
Engine: 350 tpi
Transmission: 700 r4
port size
I am trying to find out the flange size as I'm in need of the right size header gasket!
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Old May 16, 2005 | 06:29 PM
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The approximate sizes as I measured:

1.312"W x 1.305"H
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Old May 17, 2005 | 04:53 AM
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extreme 1
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From: st catharines ontario
Car: 1989 gta
Engine: 350 tpi
Transmission: 700 r4
port size
thanks vader
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