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Engine Specific Info and Questions => TDI Engine -General Info => Topic started by: Helliouse on May 02, 2008, 10:35:51 am

Title: 1Z Head, ALH head
Post by: Helliouse on May 02, 2008, 10:35:51 am

Is there any difference between these heads?

Title: 1Z Head, ALH head
Post by: RabbitGTDguy on May 02, 2008, 11:45:33 am

LOL. Not too much. A couple differences include that the ALH head....

-uses studs to fasten a cast aluminum valve cover down instead of the 3 mounting studs (similar to AAZ style) that attach the valve cover on the top of the 1z/AHU head...

- ALH head has a different shape of oil return from the head vs. the 1z/AHU heads that use the traditional hydraulic head style circular oil return found on hydraulic 8v engines...

-ALH head on the d side end of the cam and valve cover has the attachement point for the ALH's cam driven vac pump (vs. 1z/AHU that drives it off the int shaft/oil pump drive)

-Other than that...the heads are similar :)

Joe

Title: 1Z Head, ALH head
Post by: Helliouse on May 02, 2008, 01:27:19 pm

So in other words, the ALH head is the one you want...damn...

Title: 1Z Head, ALH head
Post by: RabbitGTDguy on May 02, 2008, 02:10:43 pm

if you have an ALH block...

YEAP.  :)


Joe

Title: 1Z Head, ALH head
Post by: shortysclimbin on May 03, 2008, 08:45:36 pm

I also like the alh because of the placement of everything. It is easy to work on and change injectors and glow plugs on!

PD heads have more flow options though...