10-05-2010, 08:30 PM
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CC Member
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Join Date: Mar 2003
Location: Arkadelphia, AR,
AR
Cobra Make, Engine: Kirkham 427 brushed aluminum with Keith Craft 527C.I. all aluminum FE
Posts: 992
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Not Ranked
The spring pressure is to much for sure on break in. You need break in oil with everything lubed before starting. You will need to remove the inner springs at least. We like to break the camshaft in with about 80lbs on the seat and no more than 280lbs over the nose. I would run no more than about 130 on the seat and about 330 to 340 over the nose. Must run the engine with the break in springs for about 30 minutes at about 2000 to 2800 rpms. You will then check to make sure that you have not lost a lobe at this point. If all check out well add the inner springs and run another 15 minutes with the new pressure and re-check.
This is one reason we run a lot of hydraulic roller camshafts. They are more money but in the end are they? Just let us know if we can help. Do a lot of stroker 460 style engine that work great and make 600 to 700HP on pump gas with a hydraulic roller camshaft.
Thanks, Keith Craft
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Keith C
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