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Mustang Technical Discussion > Pre 1973 > Trav's new 347 build. > Community Forums > Mustang Forum Australia - Mustang Tech

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Trav's new 347 build. Reply to topic

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boofhead
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Those heads are a work of art. Next set I purchase will be the 11Rs.
Looking good Trav.


I will someday think of something clever to say.

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trav68
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Going together well Boof although there seems to be some clearance issues between the pushrods and my Comp Cams Ultra Gold rockers. I think I may have to go down the path of purchasing some complimentary Trickflow rockers as I presume they have more clearance/relief around the pushrod side.

MLS gaskets don't compress much do they? I have a 0.040" gasket that I have lightly cinched up for pushrod measuring and just wandering how much this will through the measurement out...2/3 of stuff all is my feeling.

I have ended up retarding the cam -2deg after the degreeing process as well for those playing at home.

Trav


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boofhead
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The Multi Layer Steel gaskets (MLS) are great though by their nature your right they do not compress much at all. The changed angle for the 11 and 13 degree valves means you will require longer pushrods - even longer than you had for the older 170 heads (which would have been around 6.75. It will be around 7.2 / 7.3 for the 11R heads. I am not aware of any need for specialist rockers so I am assuming your not testing it with correct length pushrods. If need minor clearance you could use a dremel to make some room.


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trav68
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Negative. I am dialed in at the 7.2 - 7.3 range as it seems to give the best pattern and am seeing contact between rocker and pushrod.

Is clearancing the rocker and accepted practice seems a bit brutal to do that to a nice anodized gold comp rocker....


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trav68
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I might send Fordstrokers a quick email to get there thoughts on contact between rocker and pushrod. I need to get a new pushrod measuring tool as mine now seems to be bent. Not sure whether that was as a result of this clearance or whether the spring rate on these valve springs is a bit much for my checking tool either way mine needs a bit of panel beating/replacement.


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hybrid
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Maybe you need a different style pushrods?
Maybe the ones that taper towards the top?

What are you using at the moment with regards to size, ball end, non ball end etc?

I'm assuming it's the back of the rocker touching the pushrod when the valve is fully closed? My rockers would have to be at a hell of an angle for that to happen.


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trav68
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Contact is happening at max valve lift. No pushrod expert but think it is a double ball end Trickflow pushrod measurer.


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hybrid
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Trying to picture that.
The rocker is normally right out of the way at that point.

So the rocker is touching the pushrod on the inside closest to the rocker stud?
You're probably running a lot more lift than my cam, but it still seems rather strange.


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trav68
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Correct about 1 inch down from top ball end the OD of the pushrod is contacting the rocker body. The rocker body is relieved for pushrod clearance but looks like it needs another 1 - 2 mm to achieve an air gap. It is contacting I cannot even get a thin feeler gauge through.

Cam is not wild 570 lift 23x duration


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trav68
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Strange is a polite way of describing it....I was using some other words to describe the situation last night which were more humorous and colourful!


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hybrid
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Mine is only 0.512 lift, but 0.06 shouldn't make much difference.
Are they 5/16 or 3/8 pushrods?


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hybrid
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Seen this?
Looks like someone else having the same issue with the 11R heads.

forums.corral.net/foru...-help.html

One of the fixes seems to be to use trickflow rockers.


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boofhead
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If you have a minimal pattern (or getting there because you cannot test it due to interference) and the virtual line from the roller pin and rocker bearing (so rocker angle) is basically 90 degrees to the valve shaft at 1/2 lift then your on the money as far as pushrod length goes. So you either have to create some clearance or purchase other rockers. I have no problem grinding into the rockers to create extra clearance as the material is thick but that is your call. As far as loosing some gold anodising - well it gets covered by the rocker cover in the long run - then you splash oil all over it. It is really for the nice photo during the build after which it means little.


I will someday think of something clever to say.

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trav68
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Speedy response from Fordstrokers:

You can simply clearance the back of the rocker with no ill effects. There are other rockers such as the K351 rocker from ford racing which is made by crane, these clear easily. Crane gold do, comp steel do. Its up to you but clearancing your current rockers is perfectly fine. Trick flow rockers are scorpion rockers, I never use these. Its not that other rockers have more relief, other rockers are just not as bulky back there


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trav68
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Basic issue (not mine though)

sbftech.com/index.php?topic=32146.0


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