Facebook
 
Home News Videos Customer service Customer rides Signup About us Contact us
Search Options
World Products
> World Products MERLIN Rectangular Port Iron Heads
World Products MERLIN Rectangular Port Iron Heads
Big Block Chevy Heads

World’s MERLIN series has earned a reputation as the performance industry standard for Big Block Chevy power.

The cast iron MERLINS are available in both oval and rectangular port designs, with intake ports offered in 310 and 345cc configurations. Choose the port size that will provide the optimum balance of flow and velocity for your engine combination.

They are available bare or in complete assemblies that feature multi-angle valve jobs, Manley stainless steel valves and valve springs matched to camshaft requirements.

World Products Merlin cylinder heads for big Chevys combine large intake runners with open combustion chambers to produce good torque and low-end power. Assemblies include valves, springs, retainers, keepers, chromemoly screw-in studs, and hardened steel guideplates.
World Products Merlin Valve Covers


Buy From Jegs! Buy From Speedway! Buy From Summit! Buy From Herbert! Buy From Pace! Buy From Comp! Our Online Store!


TECHNICAL SPECS

Casting ID Number:
I-043C (320cc) &
I-043B (345cc)

Material: High density cast iron
Valve Seats: Intake (integral), exhaust (hardened)
Valve Guides: Integral cast iron
Spring Seats: Machined for 1.560" (can machine to 1.625")
Valves: Manley stainless steel valves in assemblies (inconel exhaust valves on marine applications)
Valve Diameter: 2.300" intake, 1.880" exhaust (11/32" stem)
Guide Plates: Stock (for best fit use World #830465-8)
Rocker Arm Studs: Screw-in style
Rocker Arms: Standard
Intake Runner: 320cc or 345cc, standard port location
Exhaust Ports: 137cc, .600 Raised
Combustion Chamber: 119cc
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
Valve Angle: Stock 24°
Accessory Bolt Holes: Stock
Chamber Design: Open

HEAD FLOW@ .800 LIFT
293 intake, 268 exhaust (Super Flow 1050)
316 intake, 290 exhaust (Super Flow 600)
All heads flowed with a standard .750" intake plate, without exhaust tube, and 28" of water.

MERLIN RECTANGLE PORT IRON
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.

-1 Assembled Heads: Hydraulic Flat Tappet Cam
1.550": 125 lbs. @ 1.980", 300 lbs. @ 1.380", coil bind @ 1.160"
MAX LIFT @ .600"


-2 Assembled Heads: Mech. Flat Tappet or Hydraulic Roller Cam
1.550": 150 lbs. @ 1.910", 350 lbs. @ 1.260", coil bind @ 1.210"
MAX LIFT @ .650"


-3 Assembled Heads: Solid Roller Street Cam
1.550": 225 lbs. @ 1.910", 520 lbs. @ 1.210", coil bind @ 1.160"
MAX LIFT @ .700"

-4 Assembled Heads: Solid Roller Race Cam
1.640": 275 lbs. @ 2.000 ", 600 lbs. @ 1.210", coil bind @ 1.050"
MAX LIFT @ .900"


Zip Code:

Within:


Search by State:

Search
World Products MERLIN Rectangular Port Iron Heads
World Products MERLIN Rectangular Port Iron Heads World Products MERLIN Rectangular Port Iron Heads World Products MERLIN Rectangular Port Iron Heads
 
 
product variations
 
BUY Use our Dealer Locator to search for purchasing options...