Building a 200HP Twin Spark - Page 18 - Alfa Romeo Bulletin Board & Forums
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post #256 of 256 (permalink) Old 03-06-2014, 07:15 PM
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The correct valve clearance to use depends mostly on the shape of the initial lift ramp of your cams. If you get the clearance too small, you don't get a sharply positive valve closing, leading to small exhaust leakage and hotter valves and seats, and a similar effect on the intake side.

I had a set of ISKY cams that had very wide lobes - long dwell at full open - with really rapid open/close ramps. Lots of power, crummy fuel milage, and very small clearances. - 0.08/0.10.

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