Page 3 of Big Block Chevrolet Merlin Cylinder Heads by World Products

merlin iii merlin iii aluminum heads for maximum performance this is the cylinder head that highly respected drag racers have employed to win nhra and ihra national event titles.they are a true high performance head capable of supporting in excess of 800 horsepower right out of the box.they boast impressive flow numbers for an out of the box head with as cast ports take your pick between 310cc and 350cc intake runners the 119cc combustion chambers and ports are replicas of proven cnc-ported designs to provide optimum combustion efficiency the assemblies come set up for either hydraulic lifter solid or hydraulic roller lifters or mechanical roller lifters they vary in valve spring and valve specs merlin iii heads are also available bare technical specifications material 355-t6 high density aluminum alloy valve seats steel intake hardened steel exhaust valve guides bronze valve spring seats machined for 1.640 springs valve size 2.300 x 1.880 rocker arm studs 7/16 screw-in style with hex shoulder furnished with assembly exhaust flange stock port location incl 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 models or 1.625 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 #1017-1 or equivalent pushrods requires heat-treated pushrods spark plugs accepts 14mm .750 reach gasketed 5/8 hex ngk 7496 or 4930 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 10 longer than stock required world #832581 310cc 350cc intake ports for max flow part 020650 020650-2 020650-3 020650-4 020660 020660-2 020660-3 020660-4 highly efficient 119cc combustion chambers cam type hydraulic solid/hyd roller racing roller hydraulic solid/hyd roller racing roller intake runner rect 310cc rect 310cc rect 310cc rect 310cc rect 350cc rect 350cc rect 350cc rect 350cc merlin iii aluminum big block chevy rectangular port cylinder heads description bare merlin iii head merlin iii head merlin iii head merlin iii head bare merlin iii head merlin iii head merlin iii head merlin iii head valve type manley race master manley severe dutyŽ manley severe dutyŽ manley race master manley severe dutyŽ manley severe dutyŽ 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 26 rev 2/07 cylinder heads

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