I Need Help Setting The Timing On My 350 Eng.

[quote=troyplus4]I Have A 1981 Chevy Truck With A 350 Eng. And I Had It Rebuilt But Now I Need To Set The Timing And I Don't Really Know Witch Way To Turn It, I've Tried Both Ways ,1 Way It Keeps Backfiring And The Other Way Nothing Happens..please Help Me With The Easier Way Just To Get It Started.[/quotehow far ahead to the front of the truck should the vaccum be?

Welcome to the forums , unfortunately you are in the wrong page . In this section (99 and newer) we don't have distributors . First suggestion .Make sure the distributor is NOT 180 degrees off . Pull the driver side valve cover off, hand crank the engine until the valves on #1 cylinder are closed, remove that plug and HAND crank the engine until the piston is all the way up (light and mirror help). At this time the rotor is pointing at #1 plug wire . IF it is exactly opposite, you must remove and reinstall the distributor so it points to that wire. Hope this helps. Post in the C/K section and an advisor will pick up from there. Rob