EMPI GT-4 Performance Camshaft for Air-Cooled VW, 300 Degree Duration

The GT-4 is the longest duration grind in the GT Series at 300 degrees, intended for large displacement engines used in drag racing and off-road competition. It is ground from a new chilled cast iron billet, Parkerized for break-in and clearanced for stroker cranks.

Technical Details

• Valve lift: .455 in. at 1.1:1 rocker ratio
• Cam lift: .414 in.
• Duration: 300 degrees
• Material: chilled cast iron billet, Parkerized, stroker clearanced
• Comparable to: Engle W125
• Included: grade 8 hardware, assembly lube and cam card

Fitment & Compatibility

For large displacement air-cooled VW engines in drag racing and off-road competition. This is a competition profile, so check valve spring and valve-to-piston clearance for your combination before ordering, and fit new EMPI lifters, part number 21-4300-0. PMB Performance has worked with air-cooled Volkswagen and Porsche parts for over 20 years. Send us your engine specification if you want the cam choice confirmed before ordering.

GT-4 77-2107-0 spec card (PDF)

Specifications