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S/R TORQUER Iron Heads
World Products' Small Block Chevrolet Iron Heads

World's SR Torquer provides up to 30HP over stock heads. The S/R Tourquer cylinder head is the preferred performance 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. Needless to say, the S/R Torquer is substantially more durable than OEM castings. They feature a a larger 2.02 Intake Valve and a 1.6 Exhaust Valve. 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 Torquer Cylinder heads are fully 50-state emissions legal.


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 (inconel exhaust valves on marine applications)
Valve Diameter: 2.020" intake, 1.600" 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 many oval tracks and sanctions as stock replacements. Check with rule book.



042660 World Products S/R Torquer 170cc Iron Head Flow Data

Valve Lift--.300 --.400 --.500 --.600 --.700 --.800
2.020 ------- 186 -- 217 -- 235 -- 222 -- 219 -- 217
1.600 ------- 137 -- 146 -- 151 -- 153 -- 154 -- 154

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"


S/R TORQUER Iron Heads
S/R TORQUER Iron Heads S/R TORQUER Iron Heads S/R TORQUER Iron Heads
S/R TORQUER Iron Heads
 
 
product variations
 
042660 S/R Torquer 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 
 
 
 
42660-1 S/R Torquer 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 
 
 
 
042670 S/R Torquer SBC 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.
$311.80
Quantity 
 
 
 
42670-1 S/R Torquer 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 
 
 
 
042770 S/R Torquer SBC Iron Head, 170cc Intake, 76cc chamber, straight plug
'87 and up Intake Face
Bare Casting
TO PURCHASE: Please "click" the small box to the right of the "BUY NOW" button first.
$311.80
Quantity 
 
 
 
042770-1 S/R Torquer SBC Assembled Iron Head, 170cc Intake, 76cc chamber, straight plug
'87 and up 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 
 
 
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