>I believe this is the old Allison unit in a new box. If so, it seems
to
>be held in lower esteem than the MSD.
>
I believe the Allison unit is in one of there lower end models. The
HI-6 is supposed to be a great piece. It is electronic, not the
transistorized hunk the MSD is.
>I have run a MSD 6A for about 10 years in my V8 roadster, very happy
>with it. Available at the mail order sources like Jeggs & Summit
around
>$125.00.
>'
I found the MSD starting out at $80 or so, and the 6A is around $125.
The Crane is $150. The verdict is still out. I don't think either
would be a bad choice.
>Results are better milage, small increase in power, can use 87 octane
at
>9: 1 compression, 8 degrees initial advance, NO ping.
>Ran 10.75 : 1 with the MSD & 93 octane for years with no ping or
>detonation.
>
87 octane at 9:1. Not bad at all
Now that you mention compression, you've got me thinking about valve
to piston clearance. I got Buick 9.6:1 pistons and a Crane 260 degree
cam @ .004 lift. Total lift with 1.6 ratio rocker arms at valves is
~0.43. Do any of you guys run a similar setup? I want to make sure
valve doesn't meet piston. We'll be using Fel-Pro gaskets which are
quite a bit thicker than the original Rover gasket, so we may get a
few more hundredths of room in there.
How can one determine the clearance? Is this an exercise in geometry
or what, or do I just talk to everyone under the sun to find the guy
who has bent rods and valves from valve meeting piston.
jay and mike
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