EngineQuest Vortec Heads vs Factory castings

Engine Quest CH350I & Other cast heads - Don Terrill's Speed-Talk

EngineQuest Vortec Cast Iron Cylinder Head - (Bare) - SB Chevy : CH350C

Shop for ENGINE QUEST Cylinder Heads and Components

EngineQuest Engine Cylinder Head Assembly CH350CA; Performance 170cc Cast Iron 64cc for 1996-2003 Chevy, GM K1500 Suburban (72-99), K2500 Suburban (72-99), P30 (72-99), C1500 (72-99), C1500 Suburban (72-99), C2500 Suburban (72-99), K1500 (72-99), K1500

GM Chevy GMC 4.3L 262 V6 Astro S10 Vortec Cylinder Heads #113 Bare - EQ Cores & Recycling

Speedmaster® Cylinder Head : 281 Cylinder Head [Bare] PCE281.1755

Do I need to spot face these screw in stud bosses for guide plates? PIC

Undercover Porting - Brzezinski Racing Products

EngineQuest Chevy 5.7L 350 Vortec Cylinder Head

GM Chevy GMC 4.3L 262 V6 Astro S10 Vortec Cylinder Head #113 Bare 12557113 - EQ Cores & Recycling