Note: This is a specialty product and is not currently available for purchase online. Please call Duncan Racing International and a DRI staff member will assist you by collecting the required specifications and placing your order. Thank you.

CAM TYPE: Hardfaced made in USA.

CORE REQUIRED: Stock Camshaft.
No Billet camshaft available for this model

GRIND OPTIONS
#170-X92
Specifications: Endurance Racing Lift: .347"/.358"
NOTES: 4

#170-X94
Specifications: Endurance Racing Lift: .370"/.370"
NOTES: 1, 3, 4

#170-X90
Specifications: Endurance Racing Lift: .380"/.380"
NOTES: 1, 3, 4

NOTES:
1.HD Valve Springs are required for this camshaft.
2.Shortened Bronze Guides are required for this camshaft.
3.Hi Compression Forged Piston required for this camshaft. Additional valve pocket relief in piston is required due to increased camshaft lift.
4. Hard Faced Rocker Arms

Rocker Arm Modification
It is highly recommended when upgrading camshaft that the rocker arms are rewelded then hard faced and heat treated to match the camshaft.
This modification is done to enhance reliability.
No Performance is gained.
Hard Face Modification $ 195.00
NOTE: Customer Must Supply 3-Rocker Arms cores (1-Intake, 2-Exhaust) in Good Condition or pay Core Charge of $153.00 3pc set)


CAMSHAFT NOTES

All camshafts will offer their maximum performance when used with a professionally ported cylinder head and professionally cut valve seats.

Valve to piston clearance MUST be checked on ALL high performance cams. We recommend .060° clearance for both intake and exhaust valves.

What is the difference between a billet and hardfaced cam?
Billet cams are sold outright with no core required. They are machined in the USA and are specially heat-treated for wear resistance. Billet cams are used when problems arise in the hardfacing process of stock cams.

Hardfaced cams are made from stock cams. In the hard facing process, stock cam lobes are welded with a hard surfacing alloy to increase durability as well as provide additional stock for high-lift profiles. The stock cam (or stock core) can then be ground to almost any desired lobe shape.

Some models such as YFZ 450 prohibit this type of modification because cam journals can distort in the welding process.