ZZ4 Engine
Le Mans Master
Joined: Jun 2007
Posts: 7,666
Likes: 1
From: Where it's always hot as Hell-South Louisiana.
St. Jude Donor '07-'08-'09-'10-'11-'12-'13
The ZZ4 heads have a D exhaust port, I matched that up with my hookers when I ordered them. Does your existing hedders have a D post flange?
Suggestion: Call Hooker and ask, they should be able to tell u PDQ.
Suggestion: Call Hooker and ask, they should be able to tell u PDQ.
Burning Brakes
Joined: Feb 2011
Posts: 849
Likes: 0
From: Woodland California
The "D" shaped ports are a lot smaller than the header flange.
So no problems man.
Ralph
One more thing I'm very happy with the ZZ4 heads.
I'm putting out close to 335hp with a stock block and Lunati's 102 cam.
with a stock auto tranny and converter.
Dual exhaust is a must. Some say it's worth 50hp.
Last edited by Ralphbf; Nov 24, 2011 at 01:33 AM.
Thread Starter
Burning Brakes
Joined: Aug 2005
Posts: 751
Likes: 0
From: Lufkin Texas
Thanks to all for the reply's 
I have ZZ4 heads on my 75 with Summit's 1 5/8 headers.
The "D" shaped ports are a lot smaller than the header flange.
So no problems man.
Ralph
One more thing I'm very happy with the ZZ4 heads.
I'm putting out close to 335hp with a stock block and Lunati's 102 cam.
with a stock auto tranny and converter.
Dual exhaust is a must. Some say it's worth 50hp.
The "D" shaped ports are a lot smaller than the header flange.
So no problems man.
Ralph
One more thing I'm very happy with the ZZ4 heads.
I'm putting out close to 335hp with a stock block and Lunati's 102 cam.
with a stock auto tranny and converter.
Dual exhaust is a must. Some say it's worth 50hp.
7th Gear
Joined: Mar 2010
Posts: 7
Likes: 0
From: Phoenix Arizona
I just purchased a ZZ4 engine to put into my '73 and would like to go the sidepipe route. Did your hooker sidepipe headers fit with the ZZ4 angled plug heads or did you go back to rear exhaust? I phoned Hooker today and they said the headers wouldn't fit. Thanks
Le Mans Master
Joined: Apr 2001
Posts: 5,941
Likes: 281
From: Was New Orleans but swam to Baton Rouge LA
Cruise-In IX Veteran
Not sure the ports, but on my ZZ4 I was using Hooker Supercomps. The none sidepipe ones and they worked fine. The header tube was bigger than the port and the angle plugs did not have any issues.
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