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Message: [QUOTE="TooManyToys, post: 1529102, member: 30841"] I've tied it three different ways so far, one being back calculated off the lifters. I just completed another with a head installed and FelPro gaskets (0.010" thicker than Motorcraft). I've got two numbers from Colt so far, 0.030" and 0.035" P to V needed. I'm not seeing that margin especially if I used the Motorcraft gaskets. I'm using lightweight springs so as I degree around I can push down on the rockers and measure the distance to the piston. But with the lighter springs, I may be missing the compression of the system, which I ran into decades ago with the 289's, gaining 0.006"-0.008" from the normal heavier weight springs. And as I wrote that, yes the lifters are filled solid. My protrusions are out of whack due to an under 0.010" under grind crack from the Ford reman motor. And I have a stock size crank ready to take its place. I'm used to way bigger clearances for high rev gas motors (289) so this has me nervous. I worked up a spreadsheet of my readings from one cylinder so I can plug in the numbers to calculate where the others are. I do have one valve with a 0.018" recession, and using this method it's even an issue with the Felpro Gaskets and the reduced protrusion - with these light springs. I may talk again to Geoff, I prefer hard numbers like you called out. Thanks for that. Motorcraft lifters, stock valve springs, and the updated 6.4 length pushrods is what I have too. [/QUOTE]

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