Chevrolet Performance 12691728 SBC Cast Iron Vortec Cylinder Head

#35512691728

Chevrolet Performance 12691728 SBC Cast Iron Vortec Cylinder Head

Bolt-on horsepower for your 1955-Newer Small Block Chevy V8
Uses modified combustion chambers and high velocity port technology to provide improved performance
Vortec cylinder heads significantly outflow non-Vortec service replacement cylinder heads and earlier OEM cast-iron heads

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Product Summary

Assembled Cylinder Head Style, Cast Iron

Bolt-on horsepower for your 1955-Newer Small Block Chevy V8
Uses modified combustion chambers and high velocity port technology to provide improved performance
Vortec cylinder heads significantly outflow non-Vortec service replacement cylinder heads and earlier OEM cast-iron heads
Completely assembled head with 1.940"/1.500" valves
Ideal for applications up to 350 horsepower - Requires Vortec specific intake manifolds

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Key Specs

MFG. Part #	12691728
Brand	Chevrolet Performance Parts
Cylinder Head Style	Assembled
Material Type	Cast Iron
Combustion Chamber Volume	64cc

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Chevrolet Performance Parts 12691728 Details

Bolt-on horsepower for your 1955-Newer Small Block Chevy V8 with a set of these Vortec cylinder heads from Chevrolet Performance.

An easy way to gain 20-40 horsepower
For use with 1955-Newer Small Block Chevy V-8 engines (except later-style LT1/LT4 engines with reverse-flow cooling)
Value-priced cast-iron cylinder heads
Uses modified combustion chambers and high velocity port technology to provide improved performance
Vortec cylinder heads significantly outflow non-Vortec service replacement cylinder heads and earlier OEM cast-iron heads
Ideal for applications up to 350 horsepower
Requires Vortec specific intake manifolds
Completely assembled head with 1.940"/1.500" valves
Uses bare head p/n: 12529093
64cc combustion chamber
Straight spark plugs
No heat risers
Camshafts with more than 0.475" lift require machining valve guide bosses and checking valve seal to valve spring retainer clearance
Can be machined for 2.020"/1.600" valves
Rocker arm studs can be pinned or drilled and tapped to 3/8"
Valve spring seat diameter is 1.280"
Casting number 10239906 or 12558062

Assembled with the following:

Intake Valves - 10241743
Valve Spring Retainer - 10241744
Exhaust Valves - 12550909
Intake Seals - 10212810
Valve Springs - 10212811
Exhaust Seals - 12564852
Valve Locks - 24503856

CARB Warning

For race/ off road use or for use on pre-1966 vehicles.

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway, or if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

CA Prop 65

CARB warning

Chevrolet Performance Parts 12691728 Specifications

KEY SPECS
MFG. Part #	12691728
Brand	Chevrolet Performance Parts
Cylinder Head Style	Assembled
Material Type	Cast Iron
Combustion Chamber Volume	64cc

GENERAL
Combustion Chamber Volume Range	60cc - 69cc
Spark Plug Style	Straight
Sold in Quantity	Each

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Questions & Answers

1 Question • 1 Answer

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i'm building a vintage 3.875 bore 283 chevy, do you know if these heads will fit

by stoney

• 3 years ago

1 answer

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Fitment

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1996-1998 Chevy C2500

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1996 Chevy Caprice

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1996-1999 Chevy Express 1500

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2000-2002 Chevy Express 1500

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1996-1999 Chevy Express 2500

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Vortec L31 Small Block Chevy

2000-2002 Chevy Express 2500

Vortec L30 Small Block Chevy

1996-1999 Chevy Express 3500

Vortec L31 Small Block Chevy

1996 Chevy G30

Vortec L31 Small Block Chevy

1996 Chevy Impala

Vortec L31 Small Block Chevy

1996-1999 Chevy K1500

Vortec L30 Small Block Chevy
Vortec L31 Small Block Chevy

1996-1999 Chevy K1500 Suburban

Vortec L31 Small Block Chevy

1996 Chevy K2500

Vortec L31 Small Block Chevy

1997-1998 Chevy K2500

Vortec L30 Small Block Chevy
Vortec L31 Small Block Chevy

1999 Chevy K2500

Vortec L31 Small Block Chevy

1996-1999 Chevy K2500 Suburban

Vortec L31 Small Block Chevy

1996-1999 Chevy K3500

Vortec L31 Small Block Chevy

1996-1999 Chevy P30

Vortec L31 Small Block Chevy

1996-1999 Chevy R25

Vortec L31 Small Block Chevy

1996-1999 Chevy Silverado

Vortec L31 Small Block Chevy

1996-1999 Chevy Suburban 1500

Vortec L31 Small Block Chevy

1996-1999 Chevy Tahoe

Vortec L31 Small Block Chevy

1998-1999 GMC C1500

Vortec L31 Small Block Chevy

1992-1999 GMC C1500 Suburban

Vortec L31 Small Block Chevy

1998-1999 GMC K1500

Vortec L31 Small Block Chevy

1992-1999 GMC K1500 Suburban

Vortec L31 Small Block Chevy

1996-2000 GMC K2500

Vortec L31 Small Block Chevy

1987 GMC R1500 Suburban

Vortec L31 Small Block Chevy

1996-2000 GMC Savana 1500

Vortec L31 Small Block Chevy

1992-2011 GMC Yukon

Vortec L31 Small Block Chevy