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Vehicle Info NeededSmall Block Chevy S/R Torquer Cast Iron Cylinder Head 170cc Intake Ports
Ships on 10/21/2026
Lowest Price Guarantee- Small Block Chevy S/R Torquer Cast Iron Cylinder Head
- 170cc Intake Ports
- 67cc Combustion Chambers
- Cut for 2.020'' Int/1.600'' Exh Valves
- Bare Head, Sold Individually
170cc intake runner Material: High density cast iron
Valve Seats: Integral intake,hardened steel exhaust
Valve Size: 2.020' x 1.600' (1.940' x 1.500' for S/R Torquer 305)
Rocker Arm Studs: 3/8' shank, screw-in style with hex shoulder furnished (complete assemblies only)
Accessory Flange: Stock locations, 7-bolt universal patternIncluded In Assembly: Erson stainless steel, ring and band valve seals, valve springs, Erson 7° retainers and keepers.
Recommended Installation Items:
Head Gaskets: Fel-Pro #1003 (265-350) or equivalent.
Puhshrods: OEM can be used. Hardened not required
Spark Plugs: Accepts 14mm-5/8' .460' reach tapered seat (Accel 274 or 276, AC-Delco 43TS or 44TS, Champion #670 or #802) or equivalent
Intake Gasket: Fel-Pro #1204 or #1256 or equivalent
Exhaust Gasket: Fel-Pro #1404 or #1405 or equivalent
Emissions Note:
This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.
CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART
Bolt-On Up To 30HP!
An improved replacement for the factory Chevrolet 305-400ci cylinder head, World Products exclusive S/R Torquer series features 170cc intake runners and can provide up to a 30 HP increase over most OEM castings. Note, however, that these heads are accepted by many racing associations as ''stock'', and are 50-state emissions legal. S/R Torquer heads accept early and late model accessories. The valve seats are hardened to provide compatibility with unleaded gas.
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The S/R Torquer heads are available in 67cc and 76cc versions for engines up to 1986 and 76cc for 1987-later applications. They are designed to use 2.020'' intake and 1.600'' exhaust valves, and work well in engines from 302 to 400ci. World's S/R Torquer 305 cylinder heads come with 58cc combustion chambers, and are ideally suited for use on 262-307ci small blocks.Technical Specifications
- Material: High density cast iron
- Valve Seats: Integral intake, hardened steel exhaust
- Valve Size: 2.020'' x 1.600''
- Accessory Flange: Stock locations, 7-bolt universal pattern
- Included In Assembly: Erson stainless steel, ring and band valve seals, valve springs, Erson 7° retainers and keepers.
Recommended Installation Items - Head Gaskets: Fel-Pro 375-1003 or equivalent
- Pushrods: OEM can be used, hardened not required
- Screw-in Studs: 3/8" or 7/16" with 7/16"-14 base thread
- Pushrod Guidplates: These heads are not machined for guide plates. If desired Flat 5/16" Erson 601 or equivalent can be used after .125" is milled off the stud bosses and the push rod holes opened
- Spark Plugs: Accepts 14mm-5/8'' .460'' reach tapered seat (Accel 274 or 276, AC-Delco 43TS or 44TS, or equivalent)
- Intake Gasket: Fel-Pro 375-1204 or 375-1256 or equivalent
- Exhaust Gasket: Fel-Pro 375-1404 or 375-1405 or equivalent
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