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I6 AU Head variations 


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 Post subject: I6 AU Head variations
Posted: Mon Apr 02, 2007 1:50 pm 
Smokin em up

Age: 63

Posts: 225

Joined: 9th Nov 2004

Ride: EDV8 Fairmont

Location: perth
WA, Australia

I am told by a head machinist / porter that there is a variation between I6 heads on AU's. In fact something like 13 different variants. Some are better flowing than others. Has anyone heard of this and if so how do you identify them. Building new engine for speedway Super Sedan.




1993 ED F/mont 5.0L, Auto, Edelbrock RPM's, CompCam XE276HR, Crane Gold Race 1.7's, Edelbrock Performer, 75mm T/B, MAP, 42lb , GenIII coils, PH4000's , Twin 2.5", Thermos & underspeeds, 3.7 LSD, 2800 stall and MoTec M800, 372fwhp @ 5400rpm & 387 ft-lb @ 4400 rpm.

Posted: Tue Apr 03, 2007 12:21 pm 
Oompa Loompa

Age: 33

Posts: 32

Joined: 4th Apr 2005

Ride: AU

Location: Melbourne
VIC, Australia

All I can think of is the three different models:

The difference between the standard and XR6 is the size of the exaust ports, i think its 38 vs 41. The valves should be the same size on all.
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