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Boss 9 lifters

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Post  fordmonsta July 26th 2023, 12:38 pm

Are z bar style lifters required for kasse boss 9 heads? Reason i ask I've got a new set if crowers I'm hoping to use. Block is still at machine shop so I'm not able to mock it up

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Post  dfree383 July 26th 2023, 12:48 pm

Yes z bar style required
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Post  rmcomprandy July 26th 2023, 6:52 pm

fordmonsta wrote:Are z bar style lifters required for kasse boss 9 heads? Reason i ask I've got a new set if crowers I'm hoping to use. Block is still at machine shop so I'm not able to mock it up

I have used hydraulic roller lifters with Boss9 heads and the straight tie-bars worked but, the pushrodss were a lot shorter and seated at the top of the lifters.

With the pushrods seating inside the lifter and 5/8" longer pushrods it is a different story.
ISKY used to sell "high button" solid roller lifters, I don't know if they still do.

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Post  hbstang July 26th 2023, 10:26 pm

any chance the straight tie bar lifters would work with an offset seat and a long taper on the pushrod?
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Post  BOSS 429 July 28th 2023, 10:05 pm

The reason for the need of the z bar is because of the laid down ehx push rod. I have not seen any straight links that will not cause a problem/interference of push rod thru the lift of the cam


-R
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Post  hbstang July 28th 2023, 11:07 pm

rich,i think the intake pushrod requires the z bar lifters to clear.exhaust just has a lot of angle,but with liters to the inside of the block the intake pushrods interfere with top of the straight link
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Post  rmcomprandy July 29th 2023, 8:36 pm

Pushrod contact with the rivets holding the tie bar is usually the issue with a straight tie bar; given the pushrod angle.

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Post  BOSS 429 August 3rd 2023, 1:38 pm

hbstang wrote:rich,i think the intake pushrod requires the z bar lifters to clear.exhaust just has a lot of angle,but with liters to the inside of the block the intake pushrods interfere with top of the straight link



Ill post some pics sometime to show ya its the ehx side thats the prob ,more so with a good push rod
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