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Kelford camshaft, GM LS V8, three-bolt cam gear
Price range: 573,00 € through 608,00 €
Kelford camshaft for the GM LS V8, three-bolt cam gear engine. Choose a profile to suit your engine parts and intended use. Profile specifications and required modifications are detailed below.
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Kelford is a New Zealand camshaft manufacturer with roots in Christchurch dating back to 1968. Its profiles range from upgrades for street-driven cars to fully built race engines. Choose the cam around the rest of the engine and its intended use, rather than simply picking the longest duration.
This selection is for the GM LS V8, three-bolt cam gear engine. Profile differences, spring recommendations and required modifications are detailed below.
Technical specifications – available profiles for this engine
Profile SS108-A
Mild LS upgrade for a daily-driven automatic car. A versatile profile with a smooth idle and modest fuel consumption. Recommended springs: KVS1518.
| Specification | Intake | Exhaust |
|---|---|---|
| Cam lift | 0.338" | 0.338" |
| Rocker ratio | 1.7 | 1.7 |
| Net valve lift | 0.575" | 0.575" |
| Advertised duration @ 0.006" | 270° | 276° |
| Duration @ .050" cam lift | 222° | 226° |
| Timing IVO @ .050" cam lift | 1 ATDC | – |
| Timing IVC @ .050" cam lift | 43 ABDC | – |
| Timing EVO @ .050" cam lift | – | 49 BBDC |
| Timing EVC @ .050" cam lift | – | 3 BTDC |
| Suggested centre lines | 112° | 116° |
| Cam lift at TDC | 0.047" | 0.042" |
Manufacturer profile information
Profile SS108-B
Stronger mid-level profile for a 5.7–6.2-litre LS with either automatic or manual transmission. Kelford's largest three-bolt LS1 profile for stock pistons and the original head deck height. Recommended springs: KVS1518.
| Specification | Intake | Exhaust |
|---|---|---|
| Cam lift | 0.353" | 0.353" |
| Rocker ratio | 1.7 | 1.7 |
| Net valve lift | 0.600" | 0.600" |
| Advertised duration @ 0.006" | 278° | 286° |
| Duration @ .050" cam lift | 230° | 236° |
| Timing IVO @ .050" cam lift | 4 BTDC | – |
| Timing IVC @ .050" cam lift | 46 ABDC | – |
| Timing EVO @ .050" cam lift | – | 53 BBDC |
| Timing EVC @ .050" cam lift | – | 3 ATDC |
| Suggested centre lines | 111° | 115° |
| Cam lift at TDC | 0.064" | 0.059" |
Manufacturer profile information
Profile SS108-B-12
Profile for a 5.7-litre LS1. Additional overlap adds mid-range pull, while the 112° lobe separation gives a noticeably lumpier idle. Recommended springs: KVS1518.
| Specification | Intake | Exhaust |
|---|---|---|
| Cam lift | 0.353" | 0.353" |
| Rocker ratio | 1.7 | 1.7 |
| Net valve lift | 0.600" | 0.600" |
| Advertised duration @ 0.006" | 282° | 290° |
| Duration @ 0.050" cam lift | 230° | 236° |
| Timing IVO @ 0.050" cam lift | 5 BTDC | – |
| Timing IVC @ 0.050" cam lift | 45 ABDC | – |
| Timing EVO @ 0.050" cam lift | – | 52 BBDC |
| Timing EVC @ 0.050" cam lift | – | 4 ATDC |
| Suggested centre lines | 110° | 114° |
| Cam lift at TDC | 0.065" | 0.062" |
Manufacturer profile information
Profile SS108-C
For a supercharged LS street car, using moderate overlap suited to boost. Recommended springs: KVS1518.
| Specification | Intake | Exhaust |
|---|---|---|
| Cam lift | 0.353" | 0.353" |
| Rocker ratio | 1.7 | 1.7 |
| Net valve lift | 0.600" | 0.600" |
| Advertised duration @ 0.006" | 276° | 288° |
| Duration @ .050" cam lift | 228° | 238° |
| Timing IVO @ .050" cam lift | 1 ATDC | – |
| Timing IVC @ .050" cam lift | 49 ABDC | – |
| Timing EVO @ .050" cam lift | – | 56 BBDC |
| Timing EVC @ .050" cam lift | – | 2 ATDC |
| Suggested centre lines | 115° | 117° |
| Cam lift at TDC | 0.047" | 0.057" |
Manufacturer profile information
Profile SS108-D
Versatile profile for a 5.7–6.2-litre LS with either automatic or manual transmission. Retains a smooth idle and suits daily driving. Recommended springs: KVS1518.
| Specification | Intake | Exhaust |
|---|---|---|
| Cam lift | 0.341" | 0.341" |
| Rocker ratio | 1.7 | 1.7 |
| Net valve lift | 0.580" | 0.580" |
| Advertised duration @ 0.006" | 274° | 282° |
| Duration @ .050" cam lift | 226° | 232° |
| Timing IVO @ .050" cam lift | 1 BTDC | – |
| Timing IVC @ .050" cam lift | 45 ABDC | – |
| Timing EVO @ .050" cam lift | – | 52 BBDC |
| Timing EVC @ .050" cam lift | – | 0 TDC |
| Suggested centre lines | 112° | 116° |
| Cam lift at TDC | 0.054" | 0.052" |
Manufacturer profile information
Profile SS108-D1
For circuit racing and drift use in an L98/LS3. Focuses on mid-range throttle response, with a rough idle. Recommended springs: PAC-1204X.
| Specification | Intake | Exhaust |
|---|---|---|
| Cam lift | 0.371" | 0.371" |
| Rocker ratio | 1.7 | 1.7 |
| Net valve lift | 0.630" | 0.630" |
| Advertised duration @ 0.006" | 284° | 302° |
| Duration @ 0.05" cam lift | 236° | 250° |
| Timing IVO @ 0.05" cam lift | 9 BTDC | – |
| Timing IVC @ 0.05" cam lift | 47 ABDC | – |
| Timing EVO @ 0.05" cam lift | – | 54 BBDC |
| Timing EVC @ 0.05" cam lift | – | 16 ATDC |
| Suggested centre lines | 109° | 109° |
| Cam lift at TDC | 0.075" | 0.099" |
Manufacturer profile information
Profile SS108-J
Mid-range throttle-response profile for an LS with rectangular-port heads. A useful choice when mid-range pull matters more than top-end power. Gives an uneven idle. Recommended springs: KVS1518.
| Specification | Intake | Exhaust |
|---|---|---|
| Cam lift | 0.353" | 0.353" |
| Rocker ratio | 1.7 | 1.7 |
| Net valve lift | 0.600" | 0.600" |
| Advertised duration @ 0.006" | 274° | 282° |
| Duration @ .050" cam lift | 226° | 232° |
| Timing IVO @ .050" cam lift | 5 BTDC | – |
| Timing IVC @ .050" cam lift | 41 ABDC | – |
| Timing EVO @ .050" cam lift | – | 48 BBDC |
| Timing EVC @ .050" cam lift | – | 4 ATDC |
| Suggested centre lines | 108° | 112° |
| Cam lift at TDC | 0.069" | 0.063" |
Manufacturer profile information
Profile SS108-JSA
LS-class cam approved by New Zealand's Jet Sprint Association. Designed for the valvetrain components specified in the class rulebook.
| Specification | Intake | Exhaust |
|---|---|---|
| Cam lift | 0.362" | 0.365" |
| Rocker ratio | 1.7 | 1.7 |
| Net valve lift | 0.615" | 0.621" |
| Advertised duration @ 0.006" | 282° | 288° |
| Duration @ 0.050" cam lift | 230° | 235° |
| Timing IVO @ 0.050" cam lift | 7 BTDC | – |
| Timing IVC @ 0.050" cam lift | 43 ABDC | – |
| Timing EVO @ 0.050" cam lift | – | 48.5 BBDC |
| Timing EVC @ 0.050" cam lift | – | 6.5 ATDC |
| Suggested centre lines | 108° | 111° |
| Cam lift at TDC | 0.072" | 0.071" |
Manufacturer profile information
Profile SS108-L1
Contact our sales team for exact specifications.
Profile SS108-L2
Contact our sales team for exact specifications.
Profile SS108-R1
An LS7 circuit and drift profile for a three-bolt cam gear. Focuses on mid-range throttle response, with a rough idle. Recommended springs: PAC-1204X.
| Specification | Intake | Exhaust |
|---|---|---|
| Cam lift | 0.371" | 0.371" |
| Rocker ratio | 1.7 | 1.7 |
| Net valve lift | 0.630" | 0.630" |
| Advertised duration @ 0.006" | 284° | 306° |
| Duration @ 0.05" cam lift | 236° | 254° |
| Timing IVO @ 0.05" cam lift | 8 BTDC | – |
| Timing IVC @ 0.05" cam lift | 48 ABDC | – |
| Timing EVO @ 0.05" cam lift | – | 59 BBDC |
| Timing EVC @ 0.05" cam lift | – | 15 ATDC |
| Suggested centre lines | 110° | 112° |
| Cam lift at TDC | 0.072" | 0.095" |
Manufacturer profile information
Profile SS108-R2
For a mid-level racing engine with cathedral-port LS heads. Suitable for street, drag, circuit or boat applications. Recommended springs: PAC-1204X.
| Specification | Intake | Exhaust |
|---|---|---|
| Cam lift | 0.371" | 0.371" |
| Rocker ratio | 1.7 | 1.7 |
| Net valve lift | 0.630" | 0.630" |
| Advertised duration @ 0.006" | 292° | 306° |
| Duration @ .050" cam lift | 244° | 254° |
| Timing IVO @ .050" cam lift | 12 BTDC | – |
| Timing IVC @ .050" cam lift | 52 ABDC | – |
| Timing EVO @ .050" cam lift | – | 59 BBDC |
| Timing EVC @ .050" cam lift | – | 15 ATDC |
| Suggested centre lines | 110° | 112° |
| Cam lift at TDC | 0.085" | 0.095" |
Manufacturer profile information
Profile SS108-R4
LS7 drag profile. Requires either a manual transmission or an automatic with a high-stall converter and transbrake. Recommended springs: PAC-1209X.
| Specification | Intake | Exhaust |
|---|---|---|
| Cam lift | 0.400" | 0.382" |
| Net valve lift | 0.680" | 0.649" |
| Advertised duration @ 0.006" | 298° | 312° |
| Duration @ .050" cam lift | 250° | 260° |
| Rocker ratio | 1.7 | 1.7 |
| Suggested centre lines | 113 ATDC | 117 BTDC |
| Timing IVO @ .050" cam lift | 12 BTDC | – |
| Timing IVC @ .050" cam lift | 58 ABDC | – |
| Timing EVO @ .050" cam lift | – | 67 BBDC |
| Timing EVC @ .050" cam lift | – | 13 ATDC |
| Cam lift at TDC | 0.089" | 0.090" |
Manufacturer profile information
Profile SS108-T
Torque-focused profile for LS-powered pickups. Tighter lobe separation and more overlap add pull, with a slightly uneven idle. Recommended springs: KVS1518.
| Specification | Intake | Exhaust |
|---|---|---|
| Cam lift | 0.341" | 0.341" |
| Rocker ratio | 1.7 | 1.7 |
| Net valve lift | 0.580" | 0.580" |
| Advertised duration @ 0.006" | 268° | 272° |
| Duration @ 0.050" cam lift | 218° | 222° |
| Timing IVO @ 0.050" cam lift | 1 BTDC | – |
| Timing IVC @ 0.050" cam lift | 37 ABDC | – |
| Timing EVO @ 0.050" cam lift | – | 43 BBDC |
| Timing EVC @ 0.050" cam lift | – | 1 BTDC |
| Suggested centre lines | 108° | 112° |
| Cam lift at TDC | 0.053" | 0.047" |
Manufacturer profile information
Profile SS108-T-EZ
EZ pickup profile for the original valvetrain and stock springs. Adds torque throughout the range, including off-road and towing use. Kelford recommends KVS1518 springs for higher-mileage engines.
| Specification | Intake | Exhaust |
|---|---|---|
| Cam lift | 0.315" | 0.315" |
| Rocker ratio | 1.7 | 1.7 |
| Net valve lift | 0.535" | 0.535" |
| Advertised duration @ 0.006" | 262° | 270° |
| Duration @ 0.050" cam lift | 212° | 218° |
| Timing IVO @ 0.050" cam lift | 2 ATDC | – |
| Timing IVC @ 0.050" cam lift | 34 ABDC | – |
| Timing EVO @ 0.050" cam lift | – | 41 BBDC |
| Timing EVC @ 0.050" cam lift | – | 3 BTDC |
| Suggested centre lines | 108° | 112° |
| Cam lift at TDC | 0.045" | 0.042" |
Manufacturer profile information
Checking heights are shown with the duration figures. Net lift is the net valve movement specified by the manufacturer, while cam lift is listed separately. IVO/IVC denote intake valve opening/closing and EVO/EVC exhaust valve opening/closing. BTDC/ATDC mean before/after top dead centre, and BBDC/ABDC before/after bottom dead centre.
Installation and profile selection
Confirm the exact engine version, valvetrain design and the modifications required by the profile. Check cam timing and valve-to-piston clearance during installation. Springs, lifters and other supporting parts mentioned with a profile are not included unless the profile explicitly states that they come with the kit.
Check the cam gear bolt pattern, trigger and valvetrain. A production LS3 generally uses a single-bolt cam, so a three-bolt cam requires the appropriate gear and fasteners. Account for L99 AFM/VVT and lifters. RX solid roller profiles require the specified lifter conversion.
Examples of related vehicle applications
- Chevrolet Corvette C5 LS1/LS6 (1997–2004)
- Chevrolet Corvette C6 LS2/LS3 (2005–2013)
- Chevrolet Camaro / Pontiac Firebird LS1 (1998–2002)
- Chevrolet Camaro SS LS3/L99 (2010–2015)
- Pontiac GTO LS1/LS2 (2004–2006)
- Pontiac G8 GXP LS3 (2009)
- Cadillac CTS-V LS6/LS2 (2004–2007)
- Holden Commodore / Monaro, LS1/LS2/LS3, check the cam gear mounting
The list covers versions with the specified engines only. Exact fitment and required modifications depend on the selected profile, cylinder head, lifters and timing system.
| Weight | 10 kg |
|---|---|
| Brand |
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