Evo head change
Seasoned HDF Member
Joined: Nov 2006
Posts: 12,878
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From: la la land jerzey
Only difference is the thread for the air filter attachment we have the reducer to do that but can can use a 1/2 X 13 by 1 inch cheap bolt like the junk at lowes Home Depot - cut it around 1/2 inch long but drill and tap a 5 / 16 X 18 thread into the center - then hacksaw cut a slot for a screw driver for the install
do not red loc tite seen that its not falling out the air filter brace keeps it in place
doing it the other way more drilling and enlarging needed but both ways will work everything fits - the other way you need those rocker boxes for the different breathing
do not red loc tite seen that its not falling out the air filter brace keeps it in place
doing it the other way more drilling and enlarging needed but both ways will work everything fits - the other way you need those rocker boxes for the different breathing
Road Master
Joined: Aug 2007
Posts: 942
Likes: 323
From: Grew up in Texas, moved to AZ
Seasoned HDF Member
Joined: May 2008
Posts: 21,031
Likes: 12,555
From: South Carolina
When using late model heads on a case breather engine, don`t use the hollow bolts to mount the backing plate, use regular bolts to close off the breather.
You can use head breather rockers on a case breather with no issues, leave the umbrella valves out.
You can use head breather rockers on a case breather with no issues, leave the umbrella valves out.
Last edited by Dan89FLSTC; Nov 3, 2022 at 08:28 AM.
Cruiser
Joined: Apr 2020
Posts: 111
Likes: 45
From: australia
I have just rebuilt an engine that has both, im curious why do you need to take the umbrella valves out?
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