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10/8/03
QUESTION 1
I have a Ford 306 in an '83 Mustang Coupe.
It has a 672 solid lift roller and 106 lobe
separation. It has tfs high port cast iron heads
and a super victor intake 1.72 roller rockers.
My question is what timing should I run? I have
tried anywhere from 32 to 38
degrees.
I can't get it to 60'. I have a lean problem
too. I have a pro systems 780 xc carb on it
and I am having detonation problems and leanness!
I've squared jets off all the way up to 99 prim
and 89 seconds and I still can't get a good
plug reading at any timing, either. I have champion
c59yc plugs gapped at .048! I am pulling 7100
rpms at shift point. It made 480 horse at rear
wheels like that. I was told by somebody to
change the high speed air bleeds, so I went
from 35 to 32 and that did help but it is still
lean, my fuel pressure is eight pounds from
the start to the finish line. Shoud I go down
more in the airbleeds? I put gas jets back to
73 82 like it came from pro systems. Patrick
James from pro systems said that is way too
much jet and to start from scratch again. I
put float level at 25% into the site plug on
secondary and just below the sight plug on primary.
It has a 456 gear and eight inch 5500 cone convertor
and trans brake, but I can't get 60' and the
mph is inconsistent, too. Help me if you can.
Thanks a lot,
Steve
Steve,
The lean condition is probably
most of your problem. This effects 60' time,
mph, and all around consistency. I think that
you may have a fuel volume problem. There can
be constant psi, but that does not reflect volume.
I would look at line size,
fuel filter, pump volume and fuel tank/cell
pick-up location.
Thanks,
Scott
QUESTION 2
What would cause a pushrod to bend or brake on a fresh motor?
Thanks,
Keith
Keith,
Bent or broken pushrods are
usually the result of not enough piston to valve
clearance.
Thanks,
Scott
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