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Messages - deckert

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FE Technical Forum / Re: Valvetrain geometry
« on: June 03, 2016, 10:47:31 PM »
The build will be used as a daily driver in a '71 F-250/CS with a T-18/4spd & 4:10's. I just wanted something with a tad more umph than the 'ol 390 had and sounded/ran better :o .

But the shim height for the rockers really made me wonder what other people did with ED heads & HS rockers? I find it hard to believe I'm the only person to hit this snag/issue? FWIW, I've spent a whole lot of time trying to find a solid answer with no luck so far.

Hindsight being 20/20, I just should have ordered the 445 from Barry and been done with the BS but I didn't want that much HP for my truck. I'll have what I want after all the BS but it's been a PITA.

Dan

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FE Technical Forum / Valvetrain geometry
« on: June 03, 2016, 12:45:33 PM »
Engine build is 390 to a 418.
Roller cam/lifters with Harland Sharp /s4006bke rockers
Heads are Edelbrock/60065
With this setup above, I need to shim my rockers up .225" to get my rockers perpendicular to the valve which puts the roller tip in the valve center at mid lift. My valve train, with shims, is setting like the middle image in the attachment.

Here's a response I received from one company: The problem people often run into with this application is they are trying to set up the geometry different then the way the original engine geometry was designed.  The Ford FE engine was originally designed to have the tip of the rocker start on the inboard of the valve stem and sweep to the outboard side at full open lift.  I have looked at several different heads and factory rocker assemblies and they all do the same thing.  Start on the inside of the valve and sweep to the outside. I have a set of the Edelbrock heads here and when I put the rocker assembly on it and the factory head they have the same geometry.  In the past few years what I have learned is people try to setup this rocker assembly with a mid lift or SB Chevy type geometry.

Should the rocker roller tips travel from side to side on the valve tip or should the rocker be perpendicular and have minimal travel on the valve tip?

I have no idea if the 'reply' is correct but it left me wondering whether I should just go with the flow or set the geometry to minimize travel on the valve tip? My personal opinion is to minimize but I'm curious what/how others view this or what was your approach/solution?

Dan

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