morning i would like to know what the base timming is as ive set it at idle 1200 rpm 13degrees btdc but when i bring the rpms to 2500-3000 rpm i get only 27degrees btdc shoulden i be around 36 degrees stock HEI distributor

THANKS

morning i would like to know what the base timming is as ive set it at idle 1200 rpm 13degrees btdc but when i bring the rpms to 2500-3000 rpm i get only 27degrees btdc shoulden i be around 36 degrees stock HEI distributor

THANKS

Personally I think 36* is gonna be about right...lotsa variables. I run about 40 but I live at 4000+ ft elevation. I locked my dizzy out...idles better...better throttle response....makes setting timing a breeze. But I guess that is a whole another thread.lol

Thanks guys ill re-check the adv. springs and weights and see if i can get 36 degrees at 3000 rpm without checking it at idle and go from there also if i remember right i dont think last time i played with it that i could get past 27 degees so that would mean that somethings sticking or the advance springs are to stiff are the springs marked for stiffnest once again thanks.

You haven't said if you are running a jet or v-drive.  In a jet getting total advance quicker will not hurt you.  I am running a 468BBC with a comp cams extreme marine hyd roller with HEI.  I have it set up to get total advance at 2200 rpm and have the total timing at 36deg. When at idle 1100 rpm timing is at 16deg with the weakest advance springs available for an hei dizzy. Depending on your cam choice will determine idle timing needed........Just my 2 cents

Good point...

A jet pump does not use much motor in the lower RPM's torque requirement wise, they start to pull some HP at about 3,000 RPM so since it is already at speed, it wont hurt to have the time "in" at that RPM, 36*BTDC is about the norm for a BBC with a compression ratio lower than 10:1 on good pump gas.

I would set it to 36* at 2500 and let her buck...

However, if you have problems starting it, it may require a seperate ignition toggle to get it cranking before you light the coil to keep it from killing the starter/battery while starting.

Most mechanical advances have approx 15 degrees of timing advance built into them.

GT