delco est vs thunderbolt timing curve

[fieromx3]

looking into a ''ready to run'' distributor set up. no reason in particular and reason doesnt matter really lol but i have the thunderbolt IV on my 1987 mercruiser 260. the ignition module is the 24S i guess meaning it has a 24 degree timing advance on top of the base timing of 8 degrees giving a TOTAL timing of 32degrees? reading the instruction on the delco EST unit it says for a TOTAL timing of only 25 degrees??? is this actually true?? or is it 25 degrees of advance ON TOP of the 8 degrees initial base timing? is the delco unit really 7 degrees short of timing vs the thunderbolt IV?? cause that could seriously impact top end power. i like the idea of the MSD disty as you can customize the timing curve and total timing but i dont got the cash for that at the moment and can pick up a DELCO unit for very good price brand new.

curious what the gurus have to say about this

 

[Scott Danforth]

its 25 degrees advance total.

its a good replacement and you wont notice much if any top end power

there is also the mallory dizzy sold thru sierra now (available on iboats)

there is also the replacment ICM module for your TB-IV

 

[Bondo]

Ayuh,..... The Thunderbolt ignition is 'bout the Best ignition ever put on a boat ,motor,......

Why would you want to throw away a perfectly good runnin' ignition,..??