Manufacturing cylinder heads and engine blocks, cast iron components in particular, is a highly involved process. World Products is built on decades of racing and engineering expertise. Precision engineered designs result in high performance castings. Hi-tech manufacturing and computerized machining centers deliver precision castings that are unrivaled in fit and reliability. As cylinder heads and blocks form the foundation of your engine -- the quality of these components affect your entire engine.

Features:

  Hardened steel exhaust seats.. Extra thick decks.. Extra thick walls throughout.. Machined valve cover rails.. Universal 7 bolt exhaust flange.. Front Flange drilled and tapped to accept all factory accessories. Accepts 1.94 intake and 1.50 exhaust. 76cc or 67cc chambers.

  Included screw-in rocker studs add value while most stock heads feature pressed-in rocker studs that can pull out and must be pinned. All World Products Stock Replacement heads feature screw-in rocker arm studs that won't pull out!!

Features:

Stock Replacement for Factory Fuelie & 70-72 LT-1 Heads

  Low Cost Fuelie and LT-1 Power Accepts 2.020" x 1.600 Valves..Choice of 67 cc or 76cc Chambers.. Screw in Rocker Arm Studs... Unleaded Fuel Compatible... Raised, Fully Machined Valve Cover Rails Accepts Perimeter and Centerbolt Valve Covers...Accepts All Early and Late Model Accessories

  S/R TORQUER ASSEMBLIES: Includes bare castings assembled with 2.020" x 1.600" stainless steel valves, umbrella seals, heavy duty   1.250" diameter springs, 7 degree retainers and locks, and screw-in rocker arm studs.

SPORTSMAN II

  200cc Intake Runner Volume. 15% More Exhaust Flow Than Original Design. Heart Shaped, Clean-Burn Chamber Design. Accepts 2.020" x 1.600" Valves. Choice of 64cc or 72cc Chamber Volume. Choice of Angled or Straight Spark Plug Bosses. Bolt on! No Piston Modifications Required. Perfect Match for 1.26" x 2.06" Intake Gaskets. Choice of Early or '86-'93 Intake Face. Raised, Fully Machined Valve Cover Rails. Accepts Perimeter and Centerbolt Valve Covers. Accepts All Early and Late Model Accessories. Accepts 1.250" and 1.550" Valve Springs. Accepts Screw-in Studs and Pushrod Guide plates. 50 State Legal: E.O. #D343-1. Hardened Exhaust Seats for Unleaded Fuel.

  High Flow, Fast Burn Technology! 200cc HIGH FLOW / HIGH TORQUE RUNNERS. If you're looking to exceed the typical 350-375 horsepower mark, you'll need more than the typical 160-170cc / stock chamber head. Airflow and usable rpm range are determined by intake runner volume and shape, respectively. Measuring 200cc in intake runner volume, Sportsman II cylinder heads deliver enough airflow to achieve up to 550 horsepower. World's smooth, tapered runner shape maintains airflow velocity to maximize low rpm torque. Exhaust runners are similarly enlarged and reshaped. Balanced, efficient airflow through the cylinder head results in maximum power throughout the rpm range. Fine tuning the Sportsman II for your application is simply a matter of proper intake manifold and camshaft selection. The Sportsman II's versatility makes it a proven winner on the street and at the track!

  FAST BURN COMBUSTION CHAMBERS! Maximum combustion chamber efficiency is achieved through a high swirl, heart shaped design. On the Sportsman II, the spark plug boss is located close to the exhaust valve and unshrouded. The intake section of the chamber is designed for complete combustion. After burning, the spent gases are directed toward the exhaust valve for maximum evacuation and scavenging. World Products casts the latest airflow and combustion technology into affordable cast iron cylinder heads.
 
 


Big Block Chevy heads
Oval port Merlin

  50 Ft-Lbs More Torque Than LS6! Hi-Torque 264cc Oval Port runners! Reinforced to resist cracks & Warpage! Integral Guides (not pressed-in like stock)! Unleaded Fuel Compatible. Integral webs tie rocker stud bosses and spring pockets together with the top deck for maximum strength. Added valve train stability improves power. Rocker stud bosses are machined for guide plates. Bolt holes above each exhaust port have been raised to unrestrict exhaust port airflow. Four 1" longer than stock head bolts per side (eight total) are required. These 1" longer than stock head bolts are available under World part # 7301 (set of 8). Spring pad depth accommodates most spring heights. Runners are smoothly shaped for maximum power. Valve cover rails are fully machined for a leak-free seal. Spring pockets accept 1.550" valve springs. Ample metal permits widening of spring pad diameter for 1.625" springs. +.100 longer than stock intake valves may be required for roller cam installed heights greater than 1.950". The spark plug boss is positioned close to the valves for efficient combustion. Fairings on either side of the spark plug boss create a "swirl effect." All valve seats receive 3 angle valve jobs to ensure proper valve sealing and airflow. All Merlin heads feature integral valve guides -- not hard to replace pressed-in guides.

Rectangular port Merlin

  Hi-Flow 315cc Rectangular Port Runners! Unrestricted D-Shaped Exhaust Ports! Unshrouded Open Style Chambers! Great for High RPM / Big Cam Applications!
  Compatible with both Mark IV and Mark V Engine Blocks! Merlin cylinder heads, unlike Chevy Mark IV heads, can be used on Mark V blocks. Mark V head gaskets must be used to prevent improper coolant flow. Extra metal surrounds water passage to support Mark V head gasket.

Prices

SR heads complete $799

SR Torquer $899

Sportsman II $999

Merlin oval or rectangle port $1399

Stage I porting (recomended) $140

Stage II porting $270

Note: All heads are fully assembled and ready to bolt on...(springs and retainers for roller cams extra)