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20v head dropping valve

420 Views 0 Replies 1 Participant Last post by  miketo
There is a tendency for the 20v head to drop an exhaust valve when boosted over 17.5 psi ....
Has anybody else experienced this, and is there a cure for it ? It seems like the valve siezes in the guide, and then gets hammered by the piston, so maybe a clearance issue ?
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