what would be the recommended base initial timing setting for an LG4 with non computer carb and HEI swapped on it

also what if you cant find a port on the carb that is not pulling vacuum at idle speed

what shoul you do then,

i see it as being a problem because when you connect the vacuum advance to a source thats pulling at idle hen it will advance your initial setting

can someone explain something here ?

i am probably just over -complicating or over-looking something here

thanks

 

At least 4-6° BTDC is a good starting point, but experimenting with timing will usually yield the best results.

As for the timed vacuum port, there is usually at least one on a 4MV. However, if the throttle stop screw is opened too far (high idle setting) the port will have some vacuum. If you are planning to use this for a vacuum advance unit, it may not matter a lot. Set the timing with the vacuum line disconnected, then connect the vacuum advance. It's quite the same as setting the base timing on an HEI/EST system withe the EST in bypass, then connecting the EST. The idle timing advance will usualy jump to near 25° with the EST active, just like connecting the vacuum advance unit. think about how they work and why, and you'll understand why the extra advance at idle is not a bad thing.