Can anyone tell me the timing spec for a 68 olds 400 engine? Basicly stock except headers and edelbrock 600 carb and performer intake.

 

See page 6C-6 of the '68 Chassis Service Manual. The book calls for 7.5 degrees BTC at 850rpm with auto trans (with or without A/C), 2.5 degrees BTC with manual trans, or 5 degrees BTC for the turnpike cruiser. The W30 calls for 12.5 degrees BTC (manual or auto trans). I'd use what you have for a starting point and work from there. With the fuel we have today, you will probably have to retard your timing from the starting point to get your most optimum timing.

Randy C.
'68 4-4-2 convertible, 400 4bbl auto