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Old 03-05-2013, 05:28 PM
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BBCs are very tempermental regarding valve train. We've had PROPERLY prepared high revvers touch the pistons with all 8 exhaust valves. I always give them .120" on the exhaust if going over 7,000. It's a good "habit" to keep, in any case. The tiny loss of compression is far offset by the less perilous position of the valve.
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Listen good!! Many BBC's become history because of this problem. I always used the .100" on the exhaust but not on a BBC, they will at least clean the carbon off the piston pad on the exhaust side..
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