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Pro Form 3.4 inch Wedge-Locking Header 12 Bolts Black Oxide Finish GM V6 | Small Block 256-400 | Buick | Oldsmobile | Pontiac | Mopar Big Block 283-440
$34.95
Each PROFORM Grade 8 Header Bolt is permanently assembled with a pair of special washers. When the bolt is torqued to 28+ ft-lbs, the washers super-hardened external teeth bite into and grip the bottom of the bolt head and the top surface of the header. After being self-locked in this manner, any bolt-loosening rotation is blocked by a wedge-locking action created by the washers interfacing, matching cams. Its an uphill climb: vibration that might ordinarily loosen the bolt actually increases the wedge-locking tension, securing the bolt even more. Because this simple wedge-locking method uses tension instead of friction, contact with oil actually facilitates the wedge effect. When changing headers, PROFORM Header Bolts can be untightened with a normal wrench, lubricated, and reused.

Features:
  • Grade 8 (12.9) Steel
  • Hex Head Type
  • 3/8"-16 Thread Diameter, 3/4" Length
  • Sold as Set of 12
Fitments:
  • GM V6 | Small Block 256-400 | Buick | Oldsmobile | Pontiac | Mopar Big Block 283-440




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WARNING: Cancer and Reproductive Harm
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Vehicle
1959
Chevrolet 3B
1959
Chevrolet 3C
1959
Chevrolet 3D
1959
Chevrolet 3E
1959
Chevrolet 3F
1985-2005
Chevrolet Astro
1955-1975, 1981
Chevrolet Bel Air
1958-1972
Chevrolet Biscayne
1969-1974, 1987-2005
Chevrolet Blazer
1958-1961, 1969-1972
Chevrolet Brookwood
1960-1986
Chevrolet C/K 10
1988-1999
Chevrolet C/K 1500
1960-1987
Chevrolet C/K 20
1988-2000
Chevrolet C/K 2500
1960-1986
Chevrolet C/K 30
1988-2000
Chevrolet C/K 3500
1982-1985
Chevrolet C15
1994-2000
Chevrolet C1500
1983-2000
Chevrolet C35
1967-2002
Chevrolet Camaro
1966-1996
Chevrolet Caprice
1982-1985
Chevrolet Celebrity
1964-1973
Chevrolet Chevelle
1963-1968
Chevrolet Chevy II
1991-1994
Chevrolet Commercial Chassis
1955-1961, 1968-1982, 1984-2004
Chevrolet Corvette
1957-1958
Chevrolet Del Ray
1959-1960, 1964-1987
Chevrolet El Camino
1996-2014, 2018-2022
Chevrolet Express
1975-1988
Chevrolet G10
1970-1974
Chevrolet G10 Van
1978-1995
Chevrolet G20
1978-1995
Chevrolet G30
1958-1985, 1994-1996
Chevrolet Impala
1975-1986
Chevrolet K5 Blazer
1959-1961, 1969-1972
Chevrolet Kingswood
1973-1976
Chevrolet Laguna
1964-1967, 1973-1983
Chevrolet Malibu
1970-1988
Chevrolet Monte Carlo
1975-1979
Chevrolet Monza
1955-1957
Chevrolet Nomad
1969-1979
Chevrolet Nova
1955-1957
Chevrolet One-Fifty Series
1961-1962
Chevrolet P10 Series
1975-1989
Chevrolet P20
1975-1999, 2001-2002
Chevrolet P30
1987
Chevrolet R/V 10
1987-1988
Chevrolet R/V 20
1987-1988
Chevrolet R/V 30
1989
Chevrolet R2500
1989-1991
Chevrolet R3500
1988-2004
Chevrolet S10
1955-1957
Chevrolet Sedan Delivery
1999-2021
Chevrolet Silverado 1500
2000-2002, 2017
Chevrolet Silverado 2500
2001-2007
Chevrolet Silverado 3500
1960-2002
Chevrolet Suburban
1995-2000
Chevrolet Tahoe
1969-1972
Chevrolet Townsman
1955-1960
Chevrolet Truck
1955-1957
Chevrolet Two-Ten Series
1989-1991
Chevrolet V3500

Pro Form Logo

About Proform

PROFORM Parts (Specialty Auto Parts of America, Inc.) is a market leader in the high-performance automotive aftermarket, developing, and manufacturing innovative products based on innovative principles. Proform was established in 1983 and its headquarters are located in Warren, Michigan. Their mission is to supply performance enthusiasts with innovative, high quality, and affordable tools, maximizing the customer's value. For over 30 years, Proform has been bringing innovation, quality, and affordability to enthusiasts for over 30 years, with dozens of patents, thousands of SKUs, and millions of delighted consumers. Each Proform component is engineered to maximize performance, value, and style.

Proform Innovation

PROFORM owns the trademarks for dozens of components and product designs and is constantly developing new products as well as expanding and improving their existing product offerings. They were the first to make affordable, non-remanufactured car parts and accessories widely available and were the first to offer the two-piece timing chain cover, the two-stage in-line fuel filter, HEI distributor tune-up kits, and direct-replacement carburetor main bodies. Furthermore, they were the first to popularize GM Officially Licensed parts with the popular Chevrolet, Bow Tie, and other divisional trademarks, as well as Ford Performance Licensed products with the Ford (sold under the PROFORM Factory Performance Parts designation).

Proform Quality

Proform offers unique tools, alternators, stock harmonic balancers, and distributors; a line of roller-tipped rocker arms with the widest selection of manufacturing processes (stamped steel, cast chrome moly, and machined extruded aluminum); and a complete line of popular and easy-to-use engine builders' tools made to intricate specifications.

PROFORM PRICING

Proform Parts are engineered to deliver the optimal balance of high quality and economic price value. These prices are the consequence of a skilled and efficient global manufacturing process, not of cost cutting. The experienced management team, product designers, engineers, and manufacturing employees work to service their customers while identifying issues to add value and meeting the demands of the enthusiast with high-quality, low-cost parts.

Proform is the factory source for Licensed Chevrolet Performance Engine Dress Parts, Licensed Ford Performance Products, carburetors, HEI distributors, electric water pumps, electric fans, engine components, and street performance equipment.

Proform Manufactures

Over 1000 engine performance components, including carburetors, rocker arms, HEI distributors, parts for GM, Ford, and Mopar, carburetors, and tools, are manufactured by this company.

Proform's components range from steel or aluminum rollers, wire alternators, wrenches, circuit testers, rotating electrical wires, building tools, starters, vehicle scales, and radiators.

Watch how Proform components are manufactured under high standards of quality.

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