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My 03 Avalanche 2500 woth the 8.1 big block on the dyno made 336hp and 433 ft/lbs of torque. Mods are as follows Raylar First Impressions of the Vortec 8.1L with Allison Transmission 8.1 Vortec Reliability & Common Problems

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In this video, Jake covers GM's 8.1 Vortec V8 engine. Production for the V8 8.1 Vortec engine ran from 2001-2006 and was found 2003 Silverado 8.1. Cranks, no start. Have fuel pressure, no spark. Any ideas ? Ran fine the last time I drove it, about 2 weeks ago.

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