what shape are the exhaust ports on a 305 tbi?
Thread Starter
Junior Member
Joined: Feb 2001
Posts: 46
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From: orange texas
what shape are the exhaust ports on a 305 tbi?
square, round, or D-port? im getting ready to install some used headers i bought on my 92' rs this weekend... i have everything i need except for exhuast gaskets...
i wanna have everything i need before i get started so i dont have to borrow anyones car...
i wanna have everything i need before i get started so i dont have to borrow anyones car...
Supreme Member
Joined: Feb 2000
Posts: 1,196
Likes: 0
From: Fort Collins, Colorado
I imagine if its like my friend's LO3 it has the "D" shaped ports. Most small blocks from 87 on are the D shape.
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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End
Current Mods: LT4 Hot Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.
Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)
7.5" 10 Bolt with 3.42s soon to come!
------------------
1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End
Current Mods: LT4 Hot Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.
Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)
7.5" 10 Bolt with 3.42s soon to come!
Moderator
Joined: Jan 2000
Posts: 19,651
Likes: 309
83Z,
Imagine the shape of a White House intern's mouth - with the tongue hanging out the bottom....
(And you thought that just because he was gone I was going to leave that one alone - HA!)
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Later,
Vader
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"I'm'a do Things My Way - It's My way or the Highway."
Adobe Acrobat Reader
Imagine the shape of a White House intern's mouth - with the tongue hanging out the bottom....
(And you thought that just because he was gone I was going to leave that one alone - HA!)
------------------
Later,
Vader
------------------
"I'm'a do Things My Way - It's My way or the Highway."
Adobe Acrobat Reader
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
My '87 305 doesn't have D-shaped ports, and it has two different type heads!
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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R. 2.93 limited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/LB9 block, ZZ3 cam and intake, TBD heads ported & polished, Hooker headers & y-pipe, 3" Catco cat).
57 Bel Air, my 1st car. 0.030 over 396, Weiand Action+, Edelbrock 1901 Q-Jet, Jacobs Omnipack, 1-3/4" headers, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere. Daily driver while Camaro was being put together.
------------------
82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R. 2.93 limited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/LB9 block, ZZ3 cam and intake, TBD heads ported & polished, Hooker headers & y-pipe, 3" Catco cat).
57 Bel Air, my 1st car. 0.030 over 396, Weiand Action+, Edelbrock 1901 Q-Jet, Jacobs Omnipack, 1-3/4" headers, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere. Daily driver while Camaro was being put together.
Supreme Member
Joined: Jul 1999
Posts: 1,431
Likes: 1
From: Huntsville, AL
Car: '00 Chevrolet Corvette
Engine: LS1
Transmission: 4L60E
Axle/Gears: 2.73
This is what the L03 heads' exhaust ports look like.
I can't find a good picture of the D-shaped exhaust ports...
-Mark W.
'88 SC Camaro w/ 305 TBI
I can't find a good picture of the D-shaped exhaust ports...
-Mark W.
'88 SC Camaro w/ 305 TBI
Supreme Member
Joined: Jul 1999
Posts: 1,431
Likes: 1
From: Huntsville, AL
Car: '00 Chevrolet Corvette
Engine: LS1
Transmission: 4L60E
Axle/Gears: 2.73
Well, it's not the best picture. These are the D-Shaped ports on my L98 heads. The LO3 heads don't have exhaust ports shaped like this.
-Mark W.
'88 SC Camaro w/ 305 TBI
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