SBC 170CC S/R HEAD BARE
WORLD PRODUCTS 043610

SBC 170CC S/R HEAD

S/R SBC Iron Head, 67ccBare

Worlds S/R cylinder heads are the preferred 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. They also come with screw-in rocker arm studs for extra durability. Needless to say, the S/R is substantially more durable than OEM castings.

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 Cylinder heads are fully 50-state emissions legal and because they are an OEM replacement head, they are legal for use by many oval tracks and race Sanctioning organizations...

• NHRA
  World castings #043600 and #043610 as replacements for Chevrolet 041, 186, 291, 462 and 492 cylinder heads.
• United Rebel Sprint Series
  World Products S/R Cylinder Heads are the ONLY heads allowed.
  
• WISSOTA
  Approved for use by The Amsoil Dirt Track Series.

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
Valve Diameter: 1.940" intake, 1.500" exhaust (11/32" stem)
Rocker Arm Studs: Screw-in style
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 most oval tracks and sanctions as stock replacements. Check with rule book.

HEAD FLOW @ .500 LIFT
220 intake, 153 exhaust (Super Flow 1050)
232 intake, 161 exhaust (Super Flow 600)
All heads flowed with a standard .750" intake plate, without exhaust tube, and 28" of water.