Proform Tall Valve Spring Height Micrometer; Range: 1.600" - 2.100" (For Most V8 Engines) R01J003S From 3000 to 4500 rpm

From 3000 to 4500 rpm

This unit comes with dual 49-State federal approved cats and 3/8in

and Idle (including IAC parameters and Idle Spark)

7/16 to 7/8 in ID

Proform Tall Valve Spring Height Micrometer; Range: 1.600" - 2.100" (For Most V8 Engines) R01J003S From 3000 to 4500 rpmMeasure installed valve spring height conveniently and accurately. Simply install the height micrometer instead of a valve spring, and then rotate the clearly engraved dial to expand the tool to seat the valve, locks and retainer. PROFORM invites racers to experience the strength, innovation, and power behind the PROFORM brand. PROFORM Parts (Specialty Auto Parts U. S. A., Inc.) is a leader in the High Performance Automotive Aftermarket by engineering