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Now you can put in a couple of bolts to cinch the intake down into position and measure the difference in height of the valve cover rail. In this case, because the block was decked, the intake rail was 0.040 higher than the head rail. Anything more than 0.015 or so is too much and may result in a leak or the pushrods hitting the holes in the intake. We removed the intake and machined 0.025 off each head-mating surface to make the fit acceptable. On final assembly, make sure you check for pushrod-to-intake interference through the range of valve motion before bolting on the intake for good. View Related Article
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