Tech Tips
Big Block Chevrolet Flat Tappet Camshafts
Big Block Chevrolets are notorious for flattening cam lobes. While some of the problem can be attributed to zinc being removed from motor oils, improper break in, improper spring pressures etc. One of the main causes is the lifter bore themselves not being machined correctly from the factory. Should you have a Big Block Chevrolet that has flattened 1 or more flat tappet camshafts, please conta....more
Recommended Valve Spring Pressures
Note: The pressure figures given here are guidelines only. Some special applications may require different pressures. When in doubt, please contact the Erson Technical Department (800-641-7920) Hydraulic Flat Tappet Camshaft: 110 lbs Seat pressure / 250-280 lbs open pressure Solid Flat Tappet Camshaft: 130 lbs Seat Pressure / 300-325 lbs open pressure Hydraulic Roller C....more
Tech Tips
Most American production engines cannot accept more than .500" lift without modifying the valve guides. When installing a cam with more than .500" lift, it is absolutely essential that clearance between the valve spring retainer and guide be checked. Do not attempt to operate an engine with less than .150" retainer-to-guide clearance. If you are using valve seals, check the clearanc....more
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