Hooker 2055's and ZZ4 "D" ports
Thread Starter
Senior Member
Joined: May 2012
Posts: 582
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From: Woodstock, IL
Car: 1984 Trans Am Recaro Edition
Engine: 355 L98 Vortec 226/234 custom cam
Transmission: TKO-600
Axle/Gears: On borrowed time...
Hooker 2055's and ZZ4 "D" ports
So I understand that the ZZ4 heads have "D" shaped ports for the exhaust manifold. If I buy these headers for my stock 305 will they fit and work well with a future ZZ4?
If it works, will I loose some performance due to the "D" shaped design?
Thanks
Chuck
If it works, will I loose some performance due to the "D" shaped design?
Thanks
Chuck
Junior Member
Joined: Jan 2005
Posts: 59
Likes: 0
From: Charlotte, NC
Car: 08 G8 GT, 98 Z28, 86 IROC, 85 Z28
Re: Hooker 2055's and ZZ4 "D" ports
I think if the 2055's are at least 1 5/8 you should be fine. It's not so much the D shape of the exhaust port as it is that they are raised 0.100". The ZZ4 heads are almost identical to the old 113 heads from the l98 vettes, which had the raised ports as well. Or, you could always go with something bigger if your main concern is performance.
Last edited by Fueled; May 8, 2013 at 02:27 PM.
Thread Starter
Senior Member
Joined: May 2012
Posts: 582
Likes: 2
From: Woodstock, IL
Car: 1984 Trans Am Recaro Edition
Engine: 355 L98 Vortec 226/234 custom cam
Transmission: TKO-600
Axle/Gears: On borrowed time...
Re: Hooker 2055's and ZZ4 "D" ports
So 1 3/4 would be best?
Is that too big a gap in the tube for a 305?
Is that too big a gap in the tube for a 305?
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