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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: 1978Bonanza on April 26, 2008, 10:49:04 am

Title: Exhaust head port
Post by: 1978Bonanza on April 26, 2008, 10:49:04 am

What is the port type on a 1983 350. Is is oval or d shape or another shape? I need to buy headers asap and need to know what port to get.

Title: Re: Exhaust head port
Post by: Captkaos on April 26, 2008, 11:22:01 am

If you order them for the application it will come correct, there wasn't any different head types for pickups, they are round.

Title: Re: Exhaust head port
Post by: 1978Bonanza on April 26, 2008, 02:53:46 pm

These say d port type. Will these fit right?


http://store.summitracing.com/partdetail.asp?autofilter=1&part=HED%2D69099&N=700+4294908216+4294908202+4294925060+4294918680+115&autoview=sku

Title: Re: Exhaust head port
Post by: 1978Bonanza on April 27, 2008, 09:12:27 pm

Those not working?

Title: Re: Exhaust head port
Post by: Blue 82 on April 27, 2008, 09:45:40 pm

D port heads were from the aluminum vette/crate motor heads
or like the GM fastburn heads

stock heads are square
with rounded corners

Title: Re: Exhaust head port
Post by: Blue 82 on April 27, 2008, 09:51:27 pm

http://store.summitracing.com/partdetail.asp?autofilter=1&part=HED%2D69090&N=700+4294908216+4294908202+4294925060+4294923429+400143+4294840140+115&autoview=sku

Title: Re: Exhaust head port
Post by: Blue 82 on April 27, 2008, 09:58:39 pm

If you use D-port headers on a square port exhaust port you may experiance leakage

(http://www.europeancorvette.com/images/Exhaust%20Manifold%20008.JPG)