Flowmaster American Thunder Dual Exhaust System - 1964-66 Ford Mustang (not GT) V8 Knee Guard Mount 645" inside diameter are used

645" inside diameter are used to equalize the installed height of valve springs

to help keep track of your part location for reassembly

Excellent resistance to oxidation breakdown caused by heat

A dial indicator is then attached to the checking tool so that lobe lift and base circle runout can be measured

32 in Compressed / 20

Flowmaster American Thunder Dual Exhaust System - 1964-66 Ford Mustang (not GT) V8 Knee Guard Mount 645" inside diameter are usedFlowmaster's 16 gauge mandrel bent pipe kits are designed to fit perfectly onto your vehicle with all the quality and performance that you would expect from Flowmaster. Features: Mandrel Bent 16 Gauge Aluminized Tubing 3 Year Limited Warranty Moderate Exterior Exhaust Tone Includes Hangers and Hardware For Easy Installation Connects After Factory Catalytic Converter Dual Out Rear Exit Dyno Tuned for Maximum Performance Vehicle Applications: 1964 1966