Attribute45: 6-bolt flange and standard snout for factory wetsump engines except 1999-00 thick flange LQ4. Optional thick tool steel pin upgrade recommended at 1000 horsepower boosted or 300+ nitrous. Dual 3/16 keyway, Woodruff key not included, re-use factory or use NAL-12561513 rear and add SUM-161000 front for blower balancers. Always clean with mineral spirits and brake-clean oil gallery with 1/4 in. engine brush PIO-4501.

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