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Technical Articles for Part Number SUM-8728-2-DLSTL
Summit Racing™ Pro LS Camshaft & Spring Kits SUM-8728-2-DLSTL
Part Number: SUM-8728-2-DLSTL
Summit Racing™ Pro LS Camshaft & Spring Kits
SUM-8728 Pro LS Big Truck Torkinator Level 2 Cam Kit, Dual Springs, St. Ret. 212/218 Dur., 110 + 3, .600/.585 Lift, 3 Bolt, 4.8, 5.3, 6.0, 6.2 Vortec
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Kit/Combo Contents
ACDelco 12557840 - ACDelco GM Genuine Parts Harmonic Balancer Fastener Bolts
Harmonic Balancer Bolt, Steel, Flanged Hex, Coarse Thread, Natural, Buick, Cadillac, Chevrolet, GMC, Hummer, Isuzu, Pontiac, Saab, Each
Kit Item Quantity: 1
Permatex 22072 - Permatex Ultra Black Maximum Oil Resistance RTV Silicone Gasket Maker
Ultra RTV, Black, Maximum Oil Resistance, Each
Kit Item Quantity: 1
Summit Racing SME-174003 - Summit Racing™ Dual Valve Spring Upgrade Kits for GM LS
Valve Spring Upgrade Kit, 1.300 OD Dual Springs, Retainers/Locks, Seals, All GM LS LS1, LS2, LS3, LS7, LSA, LS9, LQ4, LQ9, L92, L76, LY6
Kit Item Quantity: 1
Summit Racing SUM-8728R1 - Summit Racing™ Pro LS Vortec Truck Swap Camshafts
Pro LS Big Truck Torkinator High Lift. 212/218 Dur., 110+3, .600/.585 Lift, 3-bolt, 4.8 5.3 5.7 6.0 6.2, Vortec LM7 L33 LS2 L92 L96 LY6 LQ4 LQ9 , Each
Kit Item Quantity: 1
Summit Racing SUM-G2627 - Summit Racing™ Cam Change Gasket Sets
Engine Gasket Set, LS Cam Change Gasket Kit, LS-1,LS-2,LS-3,LS-6, Chevy, Set
Kit Item Quantity: 1
Overview
Brand:
Manufacturer's Part Number:
SUM-8728-2-DLSTL
Part Type:
Product Line:
Summit Racing Part Number:
SUM-8728-2-DLSTL
Cam Style:
Hydraulic roller, OE roller
Basic Operating RPM Range:
Idle-5,900
Camshaft Use:
Racing
Camshaft Manufacturers Description:
The Big Torkinator is a short-duration/high-lift beast. It's designed to make great torque from 2,000 rpm up and pulls to 6500 rpm while remaining easy on the valvetrain with proven .600 lift beehive springs. It has a steady lope and will require tuning.
Intake Duration at 050 inch Lift:
212
Exhaust Duration at 050 inch Lift:
218
Duration at 050 inch Lift:
212 int./218 exh.
Advertised Intake Duration:
261
Advertised Exhaust Duration:
267
Advertised Duration:
261 int./267 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.600 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.585 in.
Valve Lift with Factory Rocker Arm Ratio:
0.600 int./0.585 exh.
Lobe Separation (degrees):
110
Camshaft Gear Attachment:
3-bolt
Computer-Controlled Compatible:
Yes
Lifters Included:
No
Valve Springs Included:
Yes
Valve Spring Style:
Standard
Outside Diameter of Outer Spring (in.):
1.290 in.
Retainers Included:
No
Locks Included:
Yes
Valve Stem Seals Included:
Yes
Timing Chain and Gears Included:
No
Assembly Lubricant Included:
No
Pushrods Included:
No
Rocker Arms Included:
No
Gaskets Included:
Yes
Valve Springs Required:
Yes
Quantity:
Sold as a kit.
Notes:
Not for AFM or VVT equipped engines. Summit Pro LS cams are designed for engines swapped into pre-pollution controlled vehicles. Not for use in registered emissions-controlled vehicles operated on public highways and roads. 3-bolt camshaft, computer tuning required.
Special Attention:
Hazardous items are only returnable in person to a retail store due to strict shipping regulations.
Summit Racing™ Pro LS Camshaft & Spring Kits
Summit Racing™ Pro LS camshaft and spring kits are designed for GM LS engines. Each cam kit offers a budget-friendly option without sacrificing quality and performance. They're available in Stage 1 or 2 performance configurations. Stage 1 kits include the cam and matching drop in beehive springs with seals or optional upgraded dual spring and retainer kit. Stage 2 kits give you an additional cam change gasket kit and a crank bolt. Order the Summit Racing™ Pro LS camshaft kit recommended for your year/make and engine application.
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