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S/R Stock Replacement Iron Heads
World Products' Small Block Chevrolet Iron Heads

World’s 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 today’s unleaded gasolines. 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.

GM REPLACEMENT PART NUMBER CONVERSIONS

World #043600 = GM 333882, 460703, 462624, 468642, 3911032,3927187, 3932141, 3946813, 3947041, 3970126, 3973414, 3973493* 3974387, 3981598*, 3986339, 3998920, 3998991, 3998993, 3998997, 14020516, 14020517, 14020556, 14071114, 14079261

World #043610 = GM 3795896, 3814482, 3827185, 3884520, 3890462, 3911032, 3917290, 3917291, 3927186, 3932441, 3946813, 3973370, 3998993


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" and 1.250"
Valves: Manley stainless steel valves in assemblies
Valve Diameter: 1.940" intake, 1.500" exhaust (11/32" stem)
Rocker Arm Studs / Guide plates: Not included
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.



043610 World Products S/R 170cc Iron Head Flow Data

Valve Lift--.300 --.400 --.500 --.600 --.700 --.800
1.940 ------- 182 -- 216 -- 232 -- 225 -- 217 -- 217
1.500 ------- 125 -- 147 -- 161 -- 168 -- 169 -- 169

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 valves.

S/R
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
1.250": 110 lbs. @ 1.700", 300 lbs. @ 1.250", coil bind @ 1.160"
MAX LIFT @ .500"


-2 Assembled Heads: Mech. Flat Tappet or Hydraulic Roller Cam
1.440": 135 lbs. @ 1.800", 320 lbs. @ 1.200", coil bind @ 1.125"
MAX LIFT @ .600"

S/R Stock Replacement Iron Heads
S/R Stock Replacement Iron Heads S/R Stock Replacement Iron Heads S/R Stock Replacement Iron Heads
S/R Stock Replacement Iron Heads S/R Stock Replacement Iron Heads S/R Stock Replacement Iron Heads
 
 
product variations
 
042650 S/R SBC Iron Head, 170cc Intake, 58cc Chamber (for 305cid), Straight plug, 1987+ Intake Face
Choose Bare or Assembled

TO PURCHASE: Please "click" the small box to the right of the "BUY NOW" button first.
$311.80
Quantity 
 
 
 
42650-1 S/R SBC Assembled Iron Head, 170cc Intake, 58cc Chamber (for 305cid), Straight plug, 1987+ Intake Face
For hydraulic flat tappet cams w/ 1.250" spring assembly
TO PURCHASE: Please "click" the small box to the right of the "BUY NOW" button first.
$536.03
Quantity 
 
 
 
043600 S/R SBC Iron Head, 170cc Intake, 76cc chamber, straight plug
Choose Bare or Assembled
TO PURCHASE: Please "click" the small box to the right of the "BUY NOW" button first.
$311.80
Quantity 
 
 
 
43600-1 S/R SBC Assembled Iron Head, 170cc Intake, 76cc chamber, straight plug
For hydraulic flat tappet cams w/ 1.250" spring assembly
TO PURCHASE: Please "click" the small box to the right of the "BUY NOW" button first.
$536.03
Quantity 
 
 
 
043610 S/R SBC Iron Head, 170cc Intake, 67cc Chamber, Straight plug
Choose Bare or Assembled

TO PURCHASE: Please "click" the small box to the right of the "BUY NOW" button first.
$311.80
Quantity 
 
 
 
43610-1 S/R SBC Assembled Iron Head, 170cc Intake, 67cc chamber, straight plug
For hydraulic flat tappet cams w/ 1.250" spring assembly
TO PURCHASE: Please "click" the small box to the right of the "BUY NOW" button first.
$536.03
Quantity 
 
 
 
043640 043640 - S/R SBC Iron Head, 1987+ Intake Face, 170cc Intake, 76cc chamber, straight plug
TO PURCHASE: Please "click" the small box to the right of the "BUY NOW" button first.
$311.80
Quantity 
 
 
 
43640-1 S/R SBC Assembled Iron Head,170cc Intake, 76cc chamber, straight plug, 87+ Intake Face
For hydraulic flat tappet cams w/ 1.250" spring assembly
TO PURCHASE: Please "click" the small box to the right of the "BUY NOW" button first.
$536.03
Quantity 
 
 
 
043650 S/R SBC Iron Head, 1987+ Intake Face, 170cc Intake, 67cc chamber, straight plug
TO PURCHASE: Please "click" the small box to the right of the "BUY NOW" button first.
$311.80
Quantity 
 
 
 
43650-1 S/R SBC Assembled Iron Head, 1987+ Intake Face, 170cc Intake, 67cc chamber, straight plug
For hydraulic flat tappet cams w/ 1.250" spring assembly
TO PURCHASE: Please "click" the small box to the right of the "BUY NOW" button first.
$536.03
Quantity 
 
 
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