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GoParts™
1-800-976-9376
3406 Democrat Road
Memphis, TN
38118

Office Hours
8-5 CST Mon-Fri

GO-KART & JR. DRAGSTER VALVE SPRINGS, RETAINERS, & LOCKS FOR BRIGGS FLATHEAD 5HP ENGINES

VALVE SPRINGS FOR BRIGGS FLATHEAD STOCK CLASSES
Competing in stock class events can be challenging. Every little “edge” can make a world of difference. Every component of your engine must be of the highest quality. Comp Cams® GoParts™ is proud to offer you the best stock springs in the world, for use on stock class Briggs motors.
• Our stock valve springs have extended life over other stock springs
• Precision ground seats for a perfectly square spring
• Consistent pressures and superior durability over OEM configurations

SINGLE & DUAL VALVE SPRINGS FOR BRIGGS FLATHEAD MODIFIED CLASSES
GoParts™ offers several different Dual Springs for modified Briggs engines. Springs, locks, lower and upper spring retainers are available separately or in kits.

VALVE SPRINGS

Single Intake Valve Springs: #GP957-2 Class: Stock Length: 1.250" Seat @ 1.050: 6 lbs Nose @ 0.800": 17 lbs GP957-2   • Two new #GP957 stock class intake valve springs

Single Exhaust Valve Springs: #GP958-2 Class: Stock Length: 1.420" Seat @ 1.050: 16 lbs Nose @ 0.800": 29 lbs GP958-2   SPRINGS ONLY  • Two new #GP958 stock class exhaust valve springs GP958-KIT   COMPLETE KIT • Two new #GP958 stock class exhaust valve springs • Two new #GP478 billet aluminum upper retainers • Two new #GP759 billet aluminum lower retainers • Two new #GP642 locks (four pieces)

Single Outlaw Valve Springs: #GP961-2, #GP961-KIT Class: Outlaw Stock & Controlled Stock Valve Lift: Up To .325" Seat: 20-25 lbs Nose: 45-50 lbs Outlaw Stock and Controlled Stock single valve springs for valves lifts to .325” and 7500 RPM. Just enough spring to keep stock valves under control without using up too much horsepower. Made with Chrome Silicon steel. GP961-2 SPRINGS ONLY • Two new #GP961 valve springs GP961-KIT COMPLETE KIT • Two new #GP961-2 valve springs • Two new #GP478 billet aluminum upper retainers • Two new #GP759 billet aluminum lower retainers • Two new #GP642 locks (four pieces)

Dual Valve Springs: #GP959-2, #GP959-KIT Valve Lift: Up To .380" Seat: 32-35 lbs Nose: 80-100 lbs These Dual Springs provide excellent pressure for up to .380” valve lift (also great for Honda Opens). Manufactured from high tech Chrome Silicon steel and features low stress levels for long life. GP959-2 SPRINGS ONLY • Two new #GP959 dual valve springs  GP959-KIT COMPLETE KIT • Two new #GP959 dual valve springs • Two new #GP478 billet aluminum upper retainers • Two new #GP759 billet aluminum lower retainers • Two  new #GP642 locks (four pieces)

Dual Valve Springs: #GP960-2, #GP960-KIT Valve Lift: .380" to .440" Seat: 35-36 lbs Nose: 90-110 lbs Dual Springs provide superior strength for valve lifts from .380” to .440”. Manufactured from high tech Chrome Silicon steel and features low stress levels for long life. GP960-2   SPRINGS ONLY • Two new #GP960 valve springs  GP960-KIT COMPLETE KIT • Two new #GP960 valve springs • Two new #GP478 billet aluminum upper retainers • Two new #GP759 billet aluminum lower retainers • Two new #GP642 locks (four pieces)

Dual Valve Springs: #GP965-2, #GP965-KIT Class: Jr. Dragster & Open Blockzilla Valve Lift: Up To .550" Seat: 35-40 lbs Nose: 142-150 lbs Designed specifically for valve lifts up to .550” in Jr. Dragster and Open Blockzilla engines making 30+ horsepower. Constructed from Pacaloy®, a high tech spring material used in all high performance engines. Dual Springs are the ultimate in spring technology. GP965-2   SPRINGS ONLY • Two new #GP965 valve springs GP965-KIT COMPLETE KIT • Two new #GP965 valve springs • Two new #GP478 billet aluminum upper retainers • Two new #GP759 billet aluminum lower retainers • Two new #GP642 locks (four pieces)

RETAINERS

Aluminum Retainers: #GP4787-2 (upper), #GP759-2 (lower) Usage: For dual valve springs Material: Aluminum GP4787-2   • Two new #GP4787 billet aluminum upper retainers GP759-2   • Two new #GP759 billet aluminum lower retainers

Titanium Retainers: #GP647-2 (lower) Usage: For dual valve springs Material: Titanium GoParts™ Lightweight Titanium Retainers are made from a heat treated titanium alloy for maximum stiffness and minimal warpage. These new retainers provide the highest tensile strength available in any Briggs retainer and are 1/2 gram lighter than aluminum. GP647-2 • Two new #GP647 Titanium lower retainers for GoParts™ dual valve springs

LOCKS

Valve Locks: #GP642-2 Usage: Dual valve springs GP642-2 • Two new #GP642 locks (four pieces)

EFFECT OF INCORRECT VALVE SPRING SETUP

Proper installation of valve springs is a crucial step in obtaining maximum performance. If your valves springs aren't set up correctly, your engine will never achieve it's full potential no matter what else you do. Dyno testing shows just how much performance is wasted without proper setup.

We do offer specialty tools to aid in proper valve spring setup here...