Kelford camshafts, Toyota/Lexus 1UZ-FE / 3UZ-FE VVT-i
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 Toyota/Lexus 1UZ-FE / 3UZ-FE VVT-i engine. Profile differences, spring recommendations and required modifications are detailed below.
Technical specifications – available profiles for this engine
Profile 208-A
For a near-standard naturally aspirated 1UZ/3UZ VVT-i, including street, towing and jet-boat applications. Adds low- and mid-range pull. Compatible with standard springs and retains full VVT-i function. KVS1UZ springs are recommended for high-mileage engines.
| Specification | Intake | Exhaust |
|---|---|---|
| Valve clearance | 0.25mm cold at the cam | 0.35mm cold at the cam |
| Cam lift | 8.60mm | 8.65mm |
| Rocker ratio | 1 | 1 |
| Net valve lift | 8.35mm | 8.30mm |
| Advertised duration @ 0.10mm | 251° | 251° |
| Duration @ 1.00mm valve lift | 218° | 218° |
| Timing IVO @ 1.00mm valve lift | 35 BTDC | – |
| Timing IVC @ 1.00mm valve lift | 3 ABDC | – |
| Timing EVO @ 1.00mm valve lift | – | 39 BBDC |
| Timing EVC @ 1.00mm valve lift | – | 1 BTDC |
| Suggested centre lines | 74° | 110° |
| Valve lift at TDC | 4.42mm | 0.94 mm |
Manufacturer profile information
Profile 208-B
For a mildly modified naturally aspirated 1UZ/3UZ VVT-i with freer-flowing intake and exhaust. Adds mid-range pull while retaining street manners and VVT-i. Fits the standard head casting without clearancing. Requires upgraded springs, KVS1UZ is recommended.
| Specification | Intake | Exhaust |
|---|---|---|
| Valve clearance | 0.25mm cold at the cam | 0.35mm cold at the cam |
| Cam lift | 9.85mm | 9.85mm |
| Rocker ratio | 1 | 1 |
| Net valve lift | 9.60mm | 9.50mm |
| Advertised duration @ 0.10mm | 264° | 258° |
| Duration @ 1.00mm valve lift | 232° | 226° |
| Timing IVO @ 1.00mm valve lift | 36 BTDC | – |
| Timing IVC @ 1.00mm valve lift | 16 ABDC | – |
| Timing EVO @ 1.00mm valve lift | – | 43 BBDC |
| Timing EVC @ 1.00mm valve lift | – | 3 ATDC |
| Suggested centre lines | 80° | 110° |
| Valve lift at TDC | 4.85mm | 1.30 mm |
Manufacturer profile information
Profile 208-C
For a naturally aspirated 1UZ/3UZ VVT-i with at least 10.5:1 compression and an operating range around 8,000 rpm. Requires individual throttle bodies or a free-flowing intake manifold and exhaust. The head must be machined around the buckets for lobe clearance. Base circle is 33 mm, approximately 0.040 inch smaller than stock. Check piston-to-valve clearance: standard piston pockets require machining, or suitable racing pistons must be used. Requires upgraded springs and correction of retainer-to-seal clearance. Suggested springs: KVS1UZ.
| Specification | Intake | Exhaust |
|---|---|---|
| Valve clearance | 0.25mm cold at the cam | 0.35mm cold at the cam |
| Cam lift | 11.45mm | 10.95mm |
| Rocker ratio | 1 | 1 |
| Net valve lift | 11.20mm | 10.60mm |
| Advertised duration @ 0.10mm | 272° | 270° |
| Duration @ 1.00mm valve lift | 240° | 236° |
| Timing IVO @ 1.00mm valve lift | 46 BTDC | – |
| Timing IVC @ 1.00mm valve lift | 14 ABDC | – |
| Timing EVO @ 1.00mm valve lift | – | 44 BBDC |
| Timing EVC @ 1.00mm valve lift | – | 12 ATDC |
| Suggested centre lines | 74° | 106° |
| Valve lift at TDC | 6.46mm | 2.25 mm |
Manufacturer profile information
Profile 208-D
For a naturally aspirated racing engine around 450 hp and 10:1 compression, designed around the manufacturer's NZ Speedway application. High lift requires head machining around the buckets and correction of retainer-to-seal clearance. Base circle is 33 mm, approximately 0.040 inch smaller than stock. VVT-i must be deleted. Recommended springs: KVS208.
| Specification | Intake | Exhaust |
|---|---|---|
| Valve clearance | 0.25mm cold at the cam | 0.35mm cold at the cam |
| Cam lift | 11.85mm | 11.35mm |
| Rocker ratio | 1 | 1 |
| Net valve lift | 11.60mm | 11.00mm |
| Advertised duration @ 0.10mm | 282° | 276° |
| Duration @ 1.00mm valve lift | 248° | 242° |
| Timing IVO @ 1.00mm valve lift | 20 BTDC | – |
| Timing IVC @ 1.00mm valve lift | 48 ABDC | – |
| Timing EVO @ 1.00mm valve lift | – | 47 BBDC |
| Timing EVC @ 1.00mm valve lift | – | 15 ATDC |
| Suggested centre lines | 104° | 106° |
| Valve lift at TDC | 3.20mm | 2.59 mm |
Manufacturer profile information
Profile 208-E
Stage 2 for a naturally aspirated racing engine around 550 hp and 9,500 rpm, designed around a 10:1 NZ Superstock/Speedway engine. Requires head modification. Base circle is 32.5 mm, approximately 0.060 inch smaller than stock. The KVS208 spring and retainer kit is required.
| Specification | Intake | Exhaust |
|---|---|---|
| Valve clearance | 0.25mm cold at the cam | 0.35mm cold at the cam |
| Cam lift | 12.25mm | 11.75mm |
| Rocker ratio | 1 | 1 |
| Net valve lift | 12.00mm | 11.40mm |
| Advertised duration @ 0.10mm | 292° | 290° |
| Duration @ 1.00mm valve lift | 258° | 254° |
| Timing IVO @ 1.00mm valve lift | 27 BTDC | – |
| Timing IVC @ 1.00mm valve lift | 51 ABDC | – |
| Timing EVO @ 1.00mm valve lift | – | 53 BBDC |
| Timing EVC @ 1.00mm valve lift | – | 21 ATDC |
| Suggested centre lines | 102° | 106° |
| Valve lift at TDC | 4.01mm | 3.18 mm |
Manufacturer profile information
Profile 208-FI
For a mildly turbocharged or supercharged 1UZ/3UZ VVT-i. Adds mid-range pull while retaining street manners, throttle response and VVT-i. Suitable for a 58–64 mm single turbo, twin 48–54 mm turbos or an HTV1900 supercharger. Works with E85 and similar ethanol blends. No head clearancing is required. Upgraded springs are required, KVS1UZ is recommended.
| Specification | Intake | Exhaust |
|---|---|---|
| Valve clearance | 0.25mm cold at the cam | 0.35mm cold at the cam |
| Cam lift | 9.85mm | 9.85mm |
| Rocker ratio | 1 | 1 |
| Net valve lift | 9.60mm | 9.50mm |
| Advertised duration @ 0.10mm | 254° | 264° |
| Duration @ 1.00mm valve lift | 220° | 232° |
| Timing IVO @ 1.00mm valve lift | 34 BTDC | – |
| Timing IVC @ 1.00mm valve lift | 6 ABDC | – |
| Timing EVO @ 1.00mm valve lift | – | 50 BBDC |
| Timing EVC @ 1.00mm valve lift | – | 2 ATDC |
| Suggested centre lines | 76° | 114° |
| Valve lift at TDC | 4.90mm | 1.19 mm |
Manufacturer profile information
Profile 208-T
For a turbocharged 1UZ/3UZ VVT-i racing engine making approximately 750+ hp. Suitable for a 64 mm or larger single turbo, or twin 54–58 mm turbos, and E85. Requires upgraded springs. Above 30 psi and at 8,000 rpm, the KVS208 spring and retainer kit is required.
| Specification | Intake | Exhaust |
|---|---|---|
| Valve clearance | 0.25mm cold at the cam | 0.35mm cold at the cam |
| Cam lift | 10.85mm | 10.95mm |
| Rocker ratio | 1 | 1 |
| Net valve lift | 10.60mm | 10.60mm |
| Advertised duration @ 0.10mm | 265° | 270° |
| Duration @ 1.00mm valve lift | 232° | 238° |
| Timing IVO @ 1.00mm valve lift | 34 BTDC | – |
| Timing IVC @ 1.00mm valve lift | 18 ABDC | – |
| Timing EVO @ 1.00mm valve lift | – | 53 BBDC |
| Timing EVC @ 1.00mm valve lift | – | 5 ATDC |
| Suggested centre lines | 82° | 114° |
| Valve lift at TDC | 4.93mm | 1.50 mm |
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.
Examples of related vehicle applications
- Lexus LS400 / Toyota Celsior UCF20 VVT-i (1997–2000)
- Lexus GS400 / Toyota Aristo UZS161 (1997–2000)
- Lexus SC400 / Toyota Soarer UZZ30 VVT-i (1997–2000)
- Toyota Crown Majesta UZS151/UZS171/UZS18x/UZS20x (1997–2013)
- Lexus LS430 / Toyota Celsior UCF30 (2000–2006)
- Lexus GS430 (2000–2007)
- Lexus SC430 / Toyota Soarer UZZ40 (2001–2010)
- Toyota Crown UZS186 4.3 (2004–2008)
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.
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