2024 May
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SD455 Timing Desires

Vehicle Pontiac Firebird Trans Am WS6
Category Engine Modifications
Last Updated 12/11/2012
Comments The SD came with an electric device to mix ported and manifold vacuum while the key was on. This let the vacuum advance stay maxed during through operation, even at idle. I created a vacuum harness using 2 vacuum check valve and a small in-line PCV valve

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