Small Block Chevy 305ci S/R Cast Iron Cylinder Head 170cc Intake Ports

Name: Small Block Chevy 305ci S/R Cast Iron Cylinder Head 170cc Intake Ports
Brand: WORLD PRODUCTS
SKU: 955-042650
Price: 644.88 USD
Availability: InStock

^$644⁸⁸

Ships on 11/03/2026

Lowest Price Guarantee

Small Block Chevy 305ci S/R Cast Iron Cylinder Heads

170cc Intake Ports
58cc Combustion Chambers
Cut for 1.940'' Int/1.500'' Exh Valves
Bare Head, Sold Individually

Perfect for use on 262-307 cubic inch small blocks.
Material: High density cast iron
Accessory Flange: Stock locations, 7-bolt universal pattern
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 or equivalent
Intake Gasket: Fel-Pro #1204 or #1256 or equivalent
Exhaust Gasket: Fel-Pro #1404 or #1405 or equivalent

An Economical Stock Replacement Head.

There are many compelling reasons why it's smart to use S/R cylinder heads instead of worn out junkyard parts or new OEM castings. These World Products heads come with hardened steel exhaust seats compatible with unleaded gasoline. The extra thick decks and walls improve reliability. The machined valve cover rails help to eliminate leaks.

Technical Specifications

Material: High density cast iron
Valve Seats: Integral intake,hardened steel exhaust
Valve Size: 1.940'' x 1.500''
Accessory Flange: Stock locations, 7-bolt universal pattern
Included In Assembly: Erson stainless steel valves, ring and band valve seals, valve springs, Erson 7° chrome moly retainers, and keepers.

Recommended Installation Items
Head Gaskets: Fel-Pro #1003 (265-350) 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 276 or 276s, AC-Delco 44TS, Champion BL13Y or BL15Y) or equivalent
Intake Gasket: Fel-Pro #1204 or #1256 or equivalent
Exhaust Gasket: Fel-Pro #1404 or #1405 or equivalent

Here are the OEM casting numbers that World's S/R small block heads replace:
World #043600 = GM 333882, 460703, 462624, 468642, 3911032, 3927186, 3927187, 3932141, 3946813, 3947041, 3970126, 3973414, 3973493*, 3974387, 3981598*, 3986339, 3998920, 3998991, 3998993, 3998997, 14020516, 14020517, 14020556, 14071114, and 14079261.

World #043610 = GM3795896, 3814482, 3827185, 3884520, 3890462, 3911032, 3917290, 3917291, 3927186, 3932441, 3946813, 3973370 and3998993 *=Requires drilling for steam holes