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BB 454 Gen IV (Mark IV) - Pertronix distributor
Hi first thanks for accepting me in this forum.
I'm Italian and owner of a boat with 2 x BB 454 Gen IV (Mark IV) 1973 engines, Actually i'm rebuilding it and i got 2 new blocks remanufactured from USA plus all the other necessary parts (like the new distributors in this case).
I did buy 1x Pertronix D209800 and 1x Pertronix D200810 (1xSTD and 1xREV rotation ). Now the mechanic here is stopping on the Pertronix settings ... they have a doubt on the spring and limiters for the maximum mechanical advance (none 12°/blu 16°/red 20°) to use for this model of engines.
We saw from documentation that the defualt is the silver spring as per attached picture (extract of installation manual).
From orginal specs the blocks are for 4.500 rpm and are equiped with 4BBL Rochester.
Can someone help us ? Is the default silver spring the correct one to use ?
in this case wich limiter 12°, 16° or 20° should be used ?
really thanks if someone can help me. Isn't easy task .... Attachment 67220
Nick.