TFS Top End Kit Rocker to Guide Plate Height

[JasinC19]

This section is confusing me. It is in the installation instructions for the TFS heads that came in my top end kit. I measured the height specified below and got just over 1". A little shorter than suggested.

However, the confusing part is that the pushrods supplied are not adjustable. And judging by the design, I'm not sure how a longer/shorter pushrod would even change the height in question since the center of the fulcrum is the pivot point.

Can someone help me out? Is this something I need to even worry about considering the kit was designed to not really even be adjustable?

 

[need4spd90]

This is why you always need to measure pr length for YOUR engine...gasket thickness, deck height, production tolerances all come into play....

How does the rocker sweep on the valve stem tip? You're looking for the narrowest possible pattern, more than being dead center...usually anything under .060" wide is considered acceptable, narrower the better...

 

[JasinC19]

Hmm... well... everything is new. Block has never been decked. I'm surprised this is even an issue. I'm going to remeasure tonight after work and hopefully I just measured wrong.

What is a good way of measuring the sweep of the valve stem tip on the rocker arm? Some kind of white-out or something on the rocker arm and then measure what gets wiped off after a rotation?

Thanks,
Jason

 

[need4spd90]

Yeah, dry erase marker works great, even a sharpie in a pinch

 

[JasinC19]

Thanks. Just talked to a Trick Flow guy from their tech line and he said to measure using that method and make sure the wear pattern does not exceed .08....

I guess if it does then what? My valves will implode after 30,000 miles?

 

[txstang84]

They'll put axial load on the stems and wear out the guides prematurely...


Sent from my iPhone using Tapatalk

 

[Rick 91GT]

Black Sharpie works fine as well...

MOST of the time, the 6.7" PR work out just fine...your lifters are not pumped up either which could slightly effect that measurement...

 

[need4spd90]

You should use an adjustable length checker and a lifter converted to solid..checker is about $10...

 

[Rick 91GT]

and a checker spring....

 

[need4spd90]

I have 2 engines in my garage right now, mine and a buddies...both getting tfs heads, mine works best with a 6.700", his is better with a 6.750"..just an example...

 

[JasinC19]

Update: I followed your advice guys, and came up with just over .05. See pic below. I think I should be safe.

 

[txstang84]

Looks pretty well centered to me-I believe you should be gtg

 

[JasinC19]

Thanks for the thumbs up.

 

[Rick 91GT]

That looks great