Go over to classicoldsmobile.com where one of the builders claims to have sold 550 pairs of Speedmaster's Olds heads and find one post where someone claims a seat has fallen out. You would assume with even a 1% failure rate on valve seats, the forums would explode with naysayers. Bad gas travels fast and all.
Last edited by 62posbonny; 12-03-2022 at 10:19 PM.
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