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ALL WORLD PRODUCTS CYLINDER HEADS ARE PRICED INDIVIDUALLY
World's SR Torquer provides up to 30HP over stock heads. The S/R Tourquer cylinder head is the preferred performance alternative to expensive OEM castings or junkyard rebuilds. These heads are designed with extra-thick decks and walls for improved reliability as well as equipped with hardened steel exhaust seats that are compatible with todays unleaded gasolines. Needless to say, the S/R Torquer is substantially more durable than OEM castings. They feature a a larger 2.02 Intake Valve and a 1.6 Exhaust Valve.
Valve cover rails have been raised and carefully machined to eliminate oil leaks and the heads can accommodate either early style perimeter or late model center bolt valve covers. S/R Torquer Cylinder heads are fully 50-state emissions legal.
Casting ID Number: I-052, I-058
Material: High density cast iron
Valve Seats: Intake (integral), exhaust (hardened)
Valve Guides: Integral cast iron
Spring Seats: Machined for 1.560" and 1.250"
Valves: Manley stainless steel valves in assemblies (inconel exhaust valves on marine applications)
Valve Diameter: 2.020" intake, 1.600" exhaust (11/32" stem)
Rocker Arm Studs / Guide plates: Not Included
Rocker Arms: 1.5 ratio (use of 1.6 ratio will require elongation of pushrod holes)
Intake Runner: 170cc, standard port location
Exhaust Ports: 65cc, standard location
Combustion Chamber: 67cc or 76cc, straight plug orientation
Spark Plug: 14mm 5/8" .460" reach tapered style, Accel 276 or 276S or equivalent
Valve Job: Multi-angle intake and radiused exhaust
Valve Cover Rail: Raised w/ perimeter and center bolt pattern
Valve Angle: Stock 23°
Accessory Bolt Holes: Stock
50-State Emissions legal
Accepted by many oval tracks and sanctions as stock replacements. Check with rule book.
042660 World Products S/R Torquer 170cc Iron Head Flow Data
Valve Lift--.300 --.400 --.500 --.600 --.700 --.800
2.020 ------- 186 -- 217 -- 235 -- 222 -- 219 -- 217
1.600 ------- 137 -- 146 -- 151 -- 153 -- 154 -- 154
Methods used: Superflow 600, Flowed at 28" with a bowl blend 1" down, 1" radiused entry plate on the intake port, No exhaust tube, Using Manley Race Master valves.
HEAD ASSEMBLY BUYING GUIDE Use this guide to match your Cam Spring Specs to our Assembled Heads & choose which assembly you need from the choices below. Please Note: Bare Heads contain no Valves.