exhaust ports
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From: Nanaimo BC Canada
Car: 2004 GMC 2500HD
Engine: Duramax LLY
Transmission: Allison
exhaust ports
Kind of a stupid question but Im trying to figure out which header install to order and I cant decide if the exhaust ports on my 062 Vortec heads are round or oval. Help please
Joined: Jul 1999
Posts: 10,950
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From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: exhaust ports
Which headers are you looking at?
SBC exhaust ports are round. Some of the newer aftermarket heads are D-shaped and raised .100" higher than stock.
SBC exhaust ports are round. Some of the newer aftermarket heads are D-shaped and raised .100" higher than stock.
Joined: Mar 2000
Posts: 5,703
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From: Orange, CA
Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
Re: exhaust ports
This should help:
Last edited by Dyno Don; Jul 9, 2009 at 10:17 AM.
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From: Carson, CA
Car: '88 GTA, 90 Formula
Engine: 5.7 TPI, fed growth hormones
Transmission: 700r4 4u2?
Axle/Gears: 9bolt
Re: exhaust ports
Just about any SBC headers will bolt up, but the Vortec plug placement prevents you from changing about half of your spark plugs unless the headers are designed for them, otherwise you have to remove your headers to change your spark plugs. Dyno Don is the only one I know of that makes headers for the Vortech plug locations.
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