Page 2 of Big Block Chevrolet Merlin Cylinder Heads by World Products

merlin iii rectangular accepts all chevy mk iv valve train components accessories machined surfaces for superior sealing complete assemblies equipped with manley stainless steel valves improved flow for high horsepower engines true d-shaped exhaust ports assure correct installations exhaust port head bolt bosses raised 1 to unrestrict air flow exclusive right cast® technology assures optimum port accuracy technical specifications when larger displacement engines 454 plus cubic inches require additional flow choose merlin rectangular port cylinder heads with right cast® 320cc and 345cc intake runners you can expect solid gains in air/fuel mixture combustion charges these heads will really respond to higher compression ratios and are ideally suited for hot street/strip cars the larger heads with 345cc intake ports are used successfully on merlin crate motors with up to 632 cubic inches displacement and can support nearly 800 hp in box stock mode material high density cast iron valve seats integral intake hardened steel exhaust valve guides integral cast iron valve spring seats machined for 1.550 springs valve size 2.300 intake and 1.880 exhaust rocker arm studs 7/16 shank screw-in style with hex shoulder furnished with assembly exhaust flange stock port location includes accessory bolt holes included in base assembly manley racemaster 2 models or severe duty 3 -4 models 1-pc forged stainless steel valves with swirl-polished heads ring band style 2 models or pc style 3 4 models valve seals 1.550 2 -3 models or 1.640 4 model valve springs manley 7° chrome moly 2 models 10° chrome moly 3 models retainers keepers and pushrod guide plates -4 models have 10° titanium retainers recommended installation items head gaskets fel-pro #1017-1or equivalent pushrods requires heat-treated stock length pushrods spark plugs accepts 14mm .460 reach tapered seat 5/8 hex champion #670 or #802 or equivalent heat range may vary consult with engine builder intake gasket fel-pro #1211 mr gasket #121 or equivalent exhaust gasket fel-pro #1410 or equivalent head bolts 8 longer than stock required world #832580 right cast® 320cc and 345cc rect port part 030620 030620-2 030620-3 030620-4 030630 030630-2 030630-3 030630-4 119cc open chamber design is far superior to oem closed chambers cam type hydraulic solid/hyd roller racing roller hydraulic solid/hyd roller racing roller intake runner rect 320cc rect 320cc rect 320cc rect 320cc rect 345cc rect 345cc rect 345cc rect 345cc merlin cast iron big block chevy rectangular port cylinder heads description bare merlin head merlin iron head merlin iron head merlin iron head bare merlin head merlin iron head merlin iron head merlin iron head valve type manley race master manley severe duty® manley severe duty® manley race master manley severe duty® manley severe duty® spring specs 1.550 dual 150 seat 1.550 dual 225 seat 1.640 dual 275 seat 1.550 dual 150 seat 1.550 dual 225 seat 1.640 dual 275 seat max lift chamber 119cc .650 119cc .700 119cc .800 119cc 119cc .650 119cc .700 119cc .800 119cc cylinder heads rev 2/07 25

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