rs2k
Chief Petty Officer
- Joined
- Aug 2, 2008
- Messages
- 486
What would cause a non vortec carburated Chevy small block to idle well at 16 degrees BTDC but idle rough and erratic at 8 degrees? The engine will run good at that high spark advance but will obviously ping at higher RPMs. When the engine is set to 6 - 8 degrees BTDC the engine idles rough at 600 - 700. It runs great between 1000 and 5000 though.