Tired of pushing the manual ACR's, wondering if I can install ACR's in HQ heads, any downside, is it possible?

 

The MCR has the pressure release hole directly in the side of it.
The ACR has to have the same pressure release hole, unfortunately, it's not in the side of it.
The ACR pressure release hole is drilled in the head.
It releases out the exhaust port.

Without removing your heads and having a hole drilled to release pressure, I don't see how it can be done.

 

I remembered seeing pics of the heads, with the holes, off a motor.
It was Phil's 124 thread.
In the very first post he shows the chamber of a head.
The tiny hole you see is the pressure release hole.
There's another pic on here somewhere of the exhaust port...it shows the hole exit.
I believe that was Phil's pic, too...but I couldn't find it.

Anyway, here's the link to the thread showing the head chamber with the hole...
https://www.hdforums.com/forum/touri...ect-124-a.html

 

Thanks BP I see I am going to have to think some more on this. Also thinking about lowering my compression a little, maybe a fatter head gasket, the pinging in the heat concerned me running through Ariz and NM a couple weeks ago, combined with lower octane fuel.