World Products 042660 - Cylinder Head Cast Iron Chevy Small Block S/R Torquer 170cc 67cc 23Degree 2.020" x 1.600" Straight Plug, Bare Casting

World Products 042660 - Cylinder Head Cast Iron Chevy Small Block S/R Torquer 170cc 67cc 23Degree 2.020" x 1.600" Straight Plug, Bare Casting  

World's SR TORQUER provides up to 30HP over stock Head. The S/R Tourquer cylinder head is the preferred performance alternative to expensive OEM castings or junkyard rebuilds. These Head 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 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 Head can accommodate either early style perimeter or late model center bolt valve covers. S/R Torquer Cylinder Head are fully 50-state emissions legal..  

TECHNICAL SPECS

• 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"
• Valves: ERSON stainless steel valves in assemblies
• Valve Diameter: 2.020" intake, 1.600" exhaust   (11/32" stem)
• Rocker Arms: 1.5 ratio (1.6 ratio may require elongation of pushrod holes)
• Intake Runner: 170cc, standard port location
• Exhaust Ports: 65cc
• Combustion Chamber: 67 or 76cc
• Spark Plug: 14mm 5/8".460" reach tapered style. EX. ACCEL 276 or 276S
• Valve Job: Multi-angle intake and radius exhaust
• Valve Cover Rail: Raised w/ perimeter
• Valve Angle: Stock 23°
• Accessory Bolt Holes: Stock
• Guide Plates: Not machined for them
• Rocker Arm Studs: Not Included

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 v 

Heads are sold individually.