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Vortec Heads are 62 & 63cc's. Need to take 1-2 CC's out. | Hot Rod Forum
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Iron Vortec Head
Chevrolet Performance 19331470 - Small-Port Vortec Head Assembly
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Ask Away! with Jeff Smith: How Much Power Can I Make By Adding Ported Vortec Heads to My SBC Engine?
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Porting Vortec Heads 059
Summit Racing SUM-151124 Summit Racing™ Vortec Cylinder Heads | Summit Racing
Engine Masters Tests CNC-Ported Heads Against Vortec Heads On A 383 Chevy To See If The Performance Gain Is Worth The Cost! - The BangShift.com Forums
best performance SBC IRON HEADS | Grumpys Performance Garage
