Where do I get one? Do they still make them? Mine has stamped on it 8C31A V8 HP its for 509CI w/ 250 blower

ttt

That number doesn't show up on this document

Heard that one(V8 HP) is no longer available

Yep, listed as no longer available. Its the module used on HP500's with a TB IV ignition.
Best options would be to find a used one or switch to a V6 module or get a Crane box and use one of there preset timing curves.

i have a v8-hp and a v8-20, anyone know what the difference is in the timing curve, i think they are both 20* advance but one comes in slower and i think the HP is all in by 3000rpm or something like that.
im running the v6 module for a blower application. only 14* advance.
kevin

The HP modules are discontinued. I always ran the V6 module on my SC engines.
EYEBURN, you are correcty. The V8-20 only has about 15 degrees at 3000 rpm. Full advance is over 4000 rpm.
Gary

Dose any now the item number for the one that replaces it or a different one that will work the same.

I graphed the Tbolt IV advance curves based on the information given in Dennis Moores BBC book.

Dave

No replacement listed.

http://www.mercruiserparts.com/Show_...CAL+COMPONENTS