heads
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Senior Member
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Joined: Mar 2007
Posts: 578
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From: near greenbay WI
Car: Camaro RS
Engine: 305 tbi
Transmission: manual
heads
im interested in installing headers that are on order already, i need to find the casting number in order to tell weather my 305 has d ports rectangle oval ect, where is this number located??
Supreme Member
iTrader: (1)
Joined: Jul 2004
Posts: 10,763
Likes: 4
From: Calgary, AB, Canada
Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
Re: heads
Under your valve covers.
If you would have put your car information in your profile, so it shows up on your sidebar, I could have saved you the time and told you right away...
They'll either be 416's if you have an early carbed motor, 187 if you have TBI engine, or 081 if you have the later TPI setup.
I'm pretty sure they're all considered D ports, but it doesn't matter in the slightest really.
If you would have put your car information in your profile, so it shows up on your sidebar, I could have saved you the time and told you right away...
They'll either be 416's if you have an early carbed motor, 187 if you have TBI engine, or 081 if you have the later TPI setup.
I'm pretty sure they're all considered D ports, but it doesn't matter in the slightest really.
Supreme Member
Joined: Sep 2001
Posts: 6,111
Likes: 53
From: Ontario, Canada
Car: 1988 Firebird S/E
Engine: 406Ci Vortec SBC
Transmission: TH-350/3500stall
Axle/Gears: 7.5" Auburn 4.10 Posi-Traction
Re: heads
The only factory head that needs a Dport shaped exhaust flange is the Corvette L98 aluminum heads. (113)
Thread Starter
Senior Member
iTrader: (1)
Joined: Mar 2007
Posts: 578
Likes: 0
From: near greenbay WI
Car: Camaro RS
Engine: 305 tbi
Transmission: manual
Re: heads
sorry im new to this, and i have the 89 rs 305 tbi. i was under the assumption that it had square or slightly rectangular ports.
Supreme Member
iTrader: (1)
Joined: Jul 2004
Posts: 10,763
Likes: 4
From: Calgary, AB, Canada
Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
Re: heads
Yea you have the 187 heads. AFAIK it's the "normal" factory SBC port. I guess it would be called square?
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