World S/R Small Block Chevy Cylinder Heads, Straight Plug, 1.94/1.50

More performance and less expensive than rebuilding used heads. No more searching junkyards looking for cylinder heads for your motor.Looks like the smog head on the outside, but has racing head features like an extra-thick deck, screw-in rocker arm studs, and raised valve cover rails.

• Large intake & exhaust runners like double hump head
• Extra-thick decks and walls for improved reliability
• Hardened steel exhaust seats for unleaded gasoline
• Machined for 3/8" screw in studs (included)
• Raised valve cover rails to eliminate oil leaks
• Accepts early style perimeter or late model center bolt valve covers
• Can be milled for large springs
• Assembled Heads Add:
  • Heavy Duty S.S. Valves
  • Steel Retainers & Locks
  • 1.25" Hi-Po Valve Springs
  • 3 Angle Valve Job
• 67 cc / 1.94 intake head is World Products # 4361
• 76 cc / 1.94 intake head is World Products # 4360

Head Flow @ .500 Lift
220 intake, 151 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.

Item Details

Parts selection and machine work for Assembled head are done by Speedway Motors Racing Engines.

S/R Head Application Chart (GIF)

Installation Guide (PDF)

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"
Valve Diameter: 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
Spark Plug: 14mm 5/8" .460" reach tapered style
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