Bolt-On Up To 30HP!

An improved replacement for the factory Chevrolet 305-400ci cylinder head, World's 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. 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.

Material: High density cast iron
Valve Seats: Integral intake, hardened steel exhaust
Valve Size: 2.020'' x 1.600''
Rocker Arm Studs: 3/8'', screw-in with hex shoulder furnished
Accessory Flange: Stock locations, 7-bolt universal pattern

Included In Assembly: Manley Street Flo (-1 models) stainless steel 1-piece forged valves with swirl-polished heads, ring and band valve seals, valve springs, Manley 7° chrome moly retainers and keepers.