EMPI GT-4 VW Performance Camshaft - Type 1 - 1200-1600 - for 1.1 or 1.25 Rockers

EMPI GT-4 VW Performance Camshaft - Type 1 - 1200-1600 - for 1.1 or 1.25 Rockers

• Tremendous performance and maximum value for your new or rebuilt engine
• Produced from new chilled cast iron billets to EMPI’s specifications
• Parkerized for trouble-free break-in and clearanced for stroker cranks
• Grade 8 hardware, assembly lube and cam card with specs included

This is the big brother of the GT-3 cam and is a good "do it all" cam for medium to large displacement engines with a little more top end performance. Ideally headwork or larger displacement engines are needed to take advantage of this cam. Performance will increase as the ports and valve sizes increase. Whether using it with stock or 1.25 ratio rockers it provides good useable power in a wide range of engines with performance similar to the W-125 cam.

EMPI's GT-4 cam pulls well up to about 6000 RPM, or up to 6300 if you swap to 1.25 rockers, just be careful with valve train clearance! Dual springs and HD rocker shafts are necessities as are dual, two barrel carburetors. Dual single barrel carbs are hardly enough to run this cam and will have a hard time idling. This is more of a mid to top end cam but low end power will increase with more headwork and carburetion.

EMPI GT-4 Performance Camshaft Specifications:

• .455" Valve Lift with 1.1:1 Rockers
• .517" Valve Lift with 1.25:1 Rockers
• Cam Lift .414"
• Duration 300°
• Lobe Center 108°

Valve Spring Recommendations:

• Dual "Hi-Rev" w/1.1:1 Rockers
• Dual "Hi-Rev" w/1.25:1 Rockers

Recommended Rocker Assemblies:

• HD Rocker Shafts & 1.1:1
• Verify Piston to Valve Clearance with HD Rocker Shafts & 1.25:1

Recommended Compression Ratio:

• 9.5:1 to 10:1

RPM Range:

• 1800 to 6000 w/1.1:1 Rockers
• 2100 to 6300 w/1.25:1 Rockers

Recommended Carburetion:

• Dual, 2 Barrels.

Recommend Exhaust:

• 1 1/2" Diameter - minimum

Installation Notes:

All Type 1 performance cams are 3 Bolt, "early style" or "flat cams" and fit Type 1,2 & 3, 1200cc(40hp) to 1600cc based engines. The cam requires a separately sold, bolt on cam gear and must be used with a "flat cam" style oil pump. You can add the gear with the option above, or check out the links below:

• VW Flat Cam Gear - Bolt On
• VW Flat Cam Gear with Adjustable Timing - Bolt On
• VW Straight Cut Flat Cam Gear with Adjustable Timing - Bolt On

New lifters should be installed whenever a new cam is being used. Never reuse old lifters with a new cam! Here are a few of options to consider:

• Stock VW Lifter
• VW 1 Piece Billet 28mm Cam Lifters - Set of 8
• VW 1 Piece Billet 28mm Cam Lifters with Oil Hole - Set of 8

JBugs along with most engine builders, racers and auto enthusiasts, recommends using an engine oil with ZDDP or ZDTP or a ZDDP/ZDTP additive in your oil for all flat tappet camshaft engines!