Pulleys????????
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I wouldn't use anything smaller than a 10% under drive and only from ATI. Whatever you do, don't use an ASP. Do a search on all of the recent timing chain failures on cars with ASP crankshaft 'dampers'. (I put 'damper' in parenthesis because they don't dampen very well, if at all.)
The 25% under drives are too small for an LS1, not adequately controlling harmonics in the engine.
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