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The crew at JMS advised that when running any cam with more than 0.450-inch lift, the installed height of the valvesprings and retainer-to-guide clearance must be checked. This begins by assembling the valvespring retainer on the valve without the spring. Using a dial caliper, the distance from the spring seat to the bottom of the retainer is measured with the valve on its seat. It's also a good idea to measure the distance between the valve seal and the retainer at maximum lift to make sure the two will not come into contact. The generally accepted minimum is 0.050 inch, though we had much more. If there's not enough clearance, the valveguides will have to be machined down to lower the seal. View Related Article
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