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Pro Form 1 inch Wedge-Locking Header 16 Bolts Black Oxide Finish GM Big Block 396-502 | 349 | 409 | Ford Small Block 289-302-251W | Mopar 413

$37.95

Pro Form

Model #66756

In Stock


Shopper Award

Each PROFORM 12.9 Steel (equiv. 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. It's 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, 1-inch Length
  • Sold as Set of 16
Fitments:
  • GM Big Block 396-502 | 349 | 409 | Ford Small Block 289-302-251W | Mopar 413




Proposition 65

/!\ warningWARNING: Cancer and Reproductive Harm

https://www.P65Warnings.ca.gov

Vehicle Engine Notes
1970-1975
Chevrolet Bel Air

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1972
Chevrolet Bel Air

8 Cylinder 6.6 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1965-1969
Chevrolet Bel Air

8 Cylinder 6.5 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1966-1969
Chevrolet Bel Air

8 Cylinder 7.0 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1972
Chevrolet Biscayne

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1972
Chevrolet Biscayne

8 Cylinder 6.6 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1965-1969
Chevrolet Biscayne

8 Cylinder 6.5 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1966-1969
Chevrolet Biscayne

8 Cylinder 7.0 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1973-1974
Chevrolet Blazer

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1972
Chevrolet Brookwood

8 Cylinder 6.6 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1972
Chevrolet Brookwood

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1969
Chevrolet Brookwood

8 Cylinder 6.5 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1969
Chevrolet Brookwood

8 Cylinder 7.0 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1975-1980
Chevrolet C10

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1973-1974
Chevrolet C10 Pickup

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1972
Chevrolet C10 Pickup

8 Cylinder 6.6 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1968-1969
Chevrolet C10 Pickup

8 Cylinder 6.5 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1973-1980
Chevrolet C10 Suburban

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1972
Chevrolet C10 Suburban

8 Cylinder 6.6 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1968-1969
Chevrolet C10 Suburban

8 Cylinder 6.5 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1990-1993
Chevrolet C1500

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1975-1986
Chevrolet C20

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1973-1974
Chevrolet C20 Pickup

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1972
Chevrolet C20 Pickup

8 Cylinder 6.6 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1968-1969
Chevrolet C20 Pickup

8 Cylinder 6.5 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1973-1986
Chevrolet C20 Suburban

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1972
Chevrolet C20 Suburban

8 Cylinder 6.6 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1968-1969
Chevrolet C20 Suburban

8 Cylinder 6.5 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1991-2000
Chevrolet C2500

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1992-1999
Chevrolet C2500 Suburban

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1975-1986
Chevrolet C30

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1973-1974
Chevrolet C30 Pickup

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1972
Chevrolet C30 Pickup

8 Cylinder 6.6 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1968-1969
Chevrolet C30 Pickup

8 Cylinder 6.5 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1988-2000
Chevrolet C3500

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1972
Chevrolet Camaro

8 Cylinder 6.6 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1969
Chevrolet Camaro

8 Cylinder 7.0 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1967-1969
Chevrolet Camaro

8 Cylinder 6.5 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1976
Chevrolet Caprice

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1972
Chevrolet Caprice

8 Cylinder 6.6 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1966-1969
Chevrolet Caprice

8 Cylinder 6.5 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1966-1969
Chevrolet Caprice

8 Cylinder 7.0 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1973
Chevrolet Chevelle

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1972
Chevrolet Chevelle

8 Cylinder 6.6 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1965-1970
Chevrolet Chevelle

8 Cylinder 6.5 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1968
Chevrolet Chevy II

8 Cylinder 6.5 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1974
Chevrolet Corvette

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1966-1969
Chevrolet Corvette

8 Cylinder 7.0 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1965
Chevrolet Corvette

8 Cylinder 6.5 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1975
Chevrolet El Camino

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1972
Chevrolet El Camino

8 Cylinder 6.6 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1966-1970
Chevrolet El Camino

8 Cylinder 6.5 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970
Chevrolet Estate

8 Cylinder 6.6 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970
Chevrolet Estate

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1969
Chevrolet Estate

8 Cylinder 6.5 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1969
Chevrolet Estate

8 Cylinder 7.0 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1996-2000
Chevrolet Express 3500

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1973-1974
Chevrolet G10 Van

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1976
Chevrolet G20

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1973-1974
Chevrolet G20 Van

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1975-1976, 1988-1996
Chevrolet G30

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1973-1974
Chevrolet G30 Van

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1976
Chevrolet Impala

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1972
Chevrolet Impala

8 Cylinder 6.6 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1965-1969
Chevrolet Impala

8 Cylinder 6.5 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1966-1969
Chevrolet Impala

8 Cylinder 7.0 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1976, 1980
Chevrolet K10

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1973-1974
Chevrolet K10 Pickup

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1972
Chevrolet K10 Pickup

8 Cylinder 6.6 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1968-1969
Chevrolet K10 Pickup

8 Cylinder 6.5 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1973-1974
Chevrolet K10 Suburban

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1972
Chevrolet K10 Suburban

8 Cylinder 6.6 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1968-1969
Chevrolet K10 Suburban

8 Cylinder 6.5 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1976-1978
Chevrolet K20

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1973-1974
Chevrolet K20 Pickup

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1972
Chevrolet K20 Pickup

8 Cylinder 6.6 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1968-1969
Chevrolet K20 Pickup

8 Cylinder 6.5 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1973-1974, 1985
Chevrolet K20 Suburban

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1972
Chevrolet K20 Suburban

8 Cylinder 6.6 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1968-1969
Chevrolet K20 Suburban

8 Cylinder 6.5 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1991-2000
Chevrolet K2500

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1992-1999
Chevrolet K2500 Suburban

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1977, 1980-1986
Chevrolet K30

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1973-1974
Chevrolet K30 Pickup

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1972
Chevrolet K30 Pickup

8 Cylinder 6.6 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1968-1969
Chevrolet K30 Pickup

8 Cylinder 6.5 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1988-2000
Chevrolet K3500

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1976-1978
Chevrolet K5 Blazer

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1972
Chevrolet Kingswood

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1972
Chevrolet Kingswood

8 Cylinder 6.6 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1969
Chevrolet Kingswood

8 Cylinder 6.5 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1969
Chevrolet Kingswood

8 Cylinder 7.0 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1973-1975
Chevrolet Laguna

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1973-1975
Chevrolet Malibu

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1965-1967
Chevrolet Malibu

8 Cylinder 6.5 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1975
Chevrolet Monte Carlo

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1972
Chevrolet Monte Carlo

8 Cylinder 6.6 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1972
Chevrolet Nova

8 Cylinder 6.6 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1971
Chevrolet Nova

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1969-1970
Chevrolet Nova

8 Cylinder 6.5 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1973
Chevrolet P10 Van

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1976, 1979
Chevrolet P20

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1971, 1973
Chevrolet P20 Van

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1975-1999
Chevrolet P30

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1971, 1973-1974
Chevrolet P30 Van

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1972
Chevrolet P30 Van

8 Cylinder 6.6 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1987-1988
Chevrolet R20

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1987-1988
Chevrolet R20 Suburban

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1989
Chevrolet R2500

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1989-1991
Chevrolet R2500 Suburban

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1987-1988
Chevrolet R30

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1989-1991
Chevrolet R3500

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1972
Chevrolet Townsman

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1970-1972
Chevrolet Townsman

8 Cylinder 6.6 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1969
Chevrolet Townsman

8 Cylinder 6.5 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1969
Chevrolet Townsman

8 Cylinder 7.0 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1987-1988
Chevrolet V20 Suburban

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1990
Chevrolet V2500 Suburban

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1987-1988
Chevrolet V30

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish
1989-1991
Chevrolet V3500

8 Cylinder 7.4 Liter
  • Hex Head; 3/8 dia. X 1in; Blk Oxide Finish

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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