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head #61969 these heads fit 1997 later gm gen iii small-block engines from 4.8l ... compatibility with exhaust manifolds or headers angled plugs for maximum performance ... high-tech process delivers stronger castings edelbrock has now raised the bar in ... hip this aerospace process takes raw castings up to 900° f in a pressurized chamber ... literally squeezing the air out of the casting the results an incredibly strong super ... dense sand casting that has three times the fatigue life ... manifolds victor jr ls series for gm gen iii-iv ls series engines gms new ... has .200 raised intake runners same casting used for victor cnc heads small-block ... runners and 18° valve angles same casting used for victor 18° cnc notes a ...