02-02-2018, 06:12 PM
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CC Member
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Join Date: Jul 2010
Location: Augusta,
MO
Cobra Make, Engine: Sold ERA FIA 2139, 331 Weber IDF
Posts: 279
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Not Ranked
Tuning question
I am working with a customers freshly built 427FE, known specs are as follows;
Mech cam, .528" lift, 272deg adv, 232deg duration @.050, lobe center 112.
Single Holley 4160 750cfm, factory aluminum intake, factory iron heads
Issue I have is that it won't idle under 1000 rpm, manifold vacuum at 1000 rpm is 10" hg. Primary throttle blades set correctly with transition slot barely exposed.
Needs 30 deg of combined vacuum and base ignition advance with the above settings.
Carb gone through, (it is new). No apparent vacuum leaks from above. Does have PCV valve.
Questions I have;
I assume 10" vacuum is too low for this cam?
How common are intake manifold gasket leaks on FE's?
Is valve train ticking normally audible on FE's with solid lifters? I hear nothing from the valve train.
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