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and 5-position tilt
use Speedmaster cast iron cylinder heads
Impala and Buick Roadmaster
They won't leak
and a removable center section for cam adjustment or replacement
1.560" Od. 0.567" Id. 0.040" Thick Hardened Steel Valve Spring Cups Springs and 5-position tiltAs with all other parts in the valvetrain, the area where the spring sits takes a beating. The old standard shims simply will not hold up to the extreme pressures and high rpm found in today's performance engines. Speedmaster offers this set of valve spring shims to solve this problem and eliminate failures.
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