What's the mileage on the engine and what altitude are you at? check out boxwrench.com
how do you adjust the timing on a 1977 350 Chevy engine k-10
The 1977 Corvette 350 LS has ignition timing standard in this model. The purpose of the ignition timing is to help start the car in synchrony.
The ignition timing marks can be found on the main pulley. The timing marks will be scattered on the outside edge of the pulley.
The 1977 Dodge 360 engine typically has a timing specification of around 5 degrees BTDC (Before Top Dead Center) for initial ignition timing. The timing can vary slightly based on the specific application and whether the engine is equipped with a vacuum advance distributor. It's important to consult the vehicle's service manual for the exact specifications and any adjustments based on the specific setup or modifications. Always ensure the engine is at operating temperature and the timing is checked with the proper tools for accuracy.
cam timing will not change ignition timing i would try 8 or 10 degees advance at idle with the vacuum advance disconnected.
8 degrees before top dead center
what are the factory timing specs for a 1977 chevy 454
motorcraft.com shows for the 1977 F-100 with the 300 cubic inch ( 4.9 L ) straight 6 cylinder engine : ( 6 degrees BTDC ) does not specify automatic or manual transmission
Answerexample 4 before tdc :Pontiacs usually like 12-14 degrees initial advance. It's a good place to start.
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www . motorcraft . com ( no spaces ) shows : for a 1977 / F-250 / 300 cubic inch ( 4.9 L ) straight 6 cylinder engine The spark plug gap is .044 inch The ignition timing is 10 degrees BTDC ( doesn't specify manual or auto transmission ) ENGINE DECAL OVERRIDES
4-degrees BTDC. Before top dead center. The Heavyduty sets at 8-degrees BTDC.