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Thread: Go .21 Engine Question
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Old 02-16-2008, 09:21 PM
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twomanytoys
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Default RE: Go .21 Engine Question
No just leave them. If you were to run 20% then you could take a shim out to raise the compression but running 30% keep the 2 shims. Thats why they come with 2 shims so you can adjust with % of nitro.
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