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COMP Cams 648-1

Machined Steel Race Valve Locks Angle: 7°

COMP Cams 648-1

249-648-1

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COMP Cams 648-1 Machined Steel Race Valve Locks Angle: 7° $1.99
Machined Steel Race Valve Locks
  • Angle: 7°
  • Valve Stem: 5/16"
  • Single Groove
  • 1/pkg

  • COMP Cams 648-1 Details

    Race Valve Locks

  • 7° lock angle

  • Wider Angle
  • Precision Machined
  • Super Tough
  • Inside Tang
  • 1 Year Limited Warranty

  • Specifications:

    Lock Angle
    7 Deg.
    Lock Groove Quantity
    1-groove
    Lock Material
    Hardened steel
    Lock Style
    7 degree
    Manufacturing Process
    Machined
    Quantity
    Sold as a pair
    Recessed for Lash Cap
    No
    Valve Stem Diameter (in.)
    0.342
    Manufacturer's Part Number:
    648-1

    Most people believe that the tang inside a valve lock is what holds the valve spring retainer and spring in place while the engine is running, however tangs are not strong enough to withstand today's open spring loads of 1000+ pounds. The tang's sole purpose is to temporarily locate the lock, retainer, and spring relative to the valve until the taper of the retainer can nest around the outside surface of the lock. This creates the "collet effect" that binds the two together; the more spring force exerted on the retainer as the valve opens, the more force applied by the collet effect to keep the retainer and lock in place.

    With the emergence of valve sizes other than 5/16", 11/32", and 3/8", it is important to make sure valve locks match valve size. There should always be a small gap between the two halves of the lock when they are properly positioned on the valve stem. If the two halves are in contact without a gap, the valve locks are for a bigger stem. If the locks fit tight to the stem and leave a gap between the middle of the lock and the stem's outer diameter, the locks are too small for the valves. All locks should be checked before final installation to ensure they're the correct size.

    Comp Cams 7° Street Valve Locks are made from stamped, hardened steel. Designed for stock engine rebuilds and only recommended for street use with lighter spring loads. The 7° Race Valve Locks are available in Machined Steel or Titanium. They offer the same valve spring location accuracy as the 10° Super Locks, without the need to change to 10° retainers. Comp Cams 10° Super Locks handle higher spring pressures by distributing load over a larger area. This reduces the chance of a "pull-through" failure. Recommended for all race applications.

    Does COMP Cams 648-1 fit your vehicle?

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    1977-1978 CHEVROLET K5 BLAZER

    • CC: 5031
    • Liter: 5.0
    • SubModel: CUSTOM DELUXE
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1980 CHEVROLET K20 PICKUP

    • Liter: 5.0
    • SubModel: CUSTOM DELUXE
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1972 CHEVROLET CHEVELLE

    • CC: 5737
    • Liter: 5.7
    • Aspiration: N
    • SubModel: GREENBRIER
    • Engine Vin: K
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1998 GMC S15 JIMMY

    • EngineType: ALL
    • SubModel: SL

    1978 GMC G35/G3500 VAN

    • EngineType: ALL
    • SubModel: RALLY

    1958 CHEVROLET YEOMAN

    • CC: 5704
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 348
    • EngineType: V8 ( 5.7 L / 348 )

    1958-1959 GMC FM340

    • CC: 6064
    • Liter: 6.1
    • SubModel: BASE
    • CUI: 370
    • EngineType: V8 ( 6.1 L / 370 )

    1958 CHEVROLET SEDAN DELIVERY

    • CC: 5272
    • Liter: 5.3
    • SubModel: BASE
    • CUI: 322
    • EngineType: V8 ( 5.3 L / 322 )

    1970-1971 CHEVROLET BISCAYNE

    • CC: 6556
    • Liter: 6.6
    • SubModel: BASE
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1979-1980 CHEVROLET MALIBU

    • CC: 5031
    • Liter: 5.0
    • SubModel: ESTATE
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1968 GMC K35/K3500 PICKUP

    • CC: 5031
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 307
    • EngineType: V8 ( 5.0 L / 307 )

    1978-1979 PONTIAC FIREBIRD

    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1987-1995 CHEVROLET G20 VAN

    • Liter: 4.3
    • SubModel: BEAUVILLE
    • CUI: 262
    • EngineType: V6 ( 4.3 L / 262 )

    1969-1970 CHEVROLET ESTATE

    • CC: 5736
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1974 CHEVROLET K30 PICKUP

    • CC: 4801
    • Liter: 4.8
    • SubModel: BASE
    • CUI: 292
    • EngineType: L6 ( 4.8 L / 292 )

    1976 GMC SPRINT

    • Liter: 5.7
    • SubModel: SIERRA MADRE DEL SUR
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1969-1971 CHEVROLET C20 PICKUP

    • CC: 5736
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1985 GMC C1500 PICKUP

    • EngineType: ALL
    • SubModel: SIERRA CLASSIC

    1998 CHEVROLET K2500 PICKUP

    • Liter: 6.5
    • Aspiration: T
    • SubModel: SILVERADO
    • Engine Vin: F
    • CUI: 395
    • EngineType: V8 ( 6.5 L / 395 )

    1988-1993 CHEVROLET K2500 PICKUP

    • Liter: 6.2
    • SubModel: CHEYENNE
    • CUI: 379
    • EngineType: V8 ( 6.2 L / 379 )

    1976 MERCURY MONARCH

    • Liter: 5.8
    • SubModel: GRAND GHIA
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1979 GMC C2500 PICKUP

    • Liter: 6.6
    • SubModel: SIERRA GRANDE
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1959-1961 CHEVROLET KINGSWOOD

    • CC: 5704
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 348
    • EngineType: V8 ( 5.7 L / 348 )

    1975-1976 CHEVROLET G30 VAN

    • Liter: 4.8
    • SubModel: HI-CUBE
    • CUI: 292
    • EngineType: L6 ( 4.8 L / 292 )

    1987-1988 CHEVROLET R30 PICKUP

    • Liter: 6.2
    • SubModel: SCOTTSDALE
    • CUI: 379
    • EngineType: V8 ( 6.2 L / 379 )

    1975-1976 GMC K1500 PICKUP

    • Liter: 4.8
    • SubModel: SIERRA GRANDE
    • CUI: 292
    • EngineType: L6 ( 4.8 L / 292 )

    1994-1998 GMC K3500 PICKUP

    • Liter: 6.5
    • SubModel: SIERRA SL
    • CUI: 395
    • EngineType: V8 ( 6.5 L / 395 )

    1987-1991 GMC G35/G3500 VAN

    • Liter: 6.2
    • SubModel: RALLY STX
    • CUI: 379
    • EngineType: V8 ( 6.2 L / 379 )

    1968 CHEVROLET CHEVELLE

    • CC: 6489
    • Liter: 6.5
    • SubModel: 300
    • CUI: 396
    • EngineType: V8 ( 6.5 L / 396 )

    1976 GMC G35/G3500 VAN

    • EngineType: ALL
    • SubModel: RALLY STX

    1980 GMC C1500 PICKUP

    • Liter: 6.6
    • SubModel: HEAVY HALF
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1973 GMC C35/C3500 PICKUP

    • CC: 5736
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1972 GMC C35/C3500 PICKUP

    • CC: 5736
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1973-1974 PONTIAC LEMANS

    • CC: 6555
    • Liter: 6.6
    • Aspiration: N
    • SubModel: SAFARI
    • Engine Vin: R
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1972 CHEVROLET K20 PICKUP

    • CC: 5736
    • Liter: 5.7
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: E
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1992-1996 FORD E-150 ECONOLINE

    • Liter: 5.8
    • SubModel: BASE
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1977-1979 FORD F-250

    • Liter: 5.8
    • Aspiration: N
    • SubModel: RANGER XLT
    • Engine Vin: H
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1969-1973 GMC C25/C2500 PICKUP

    • CC: 5031
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 307
    • EngineType: V8 ( 5.0 L / 307 )

    1969-1971 CHEVROLET K20 PICKUP

    • CC: 5736
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1975-1976 CHEVROLET CAPRICE

    • Liter: 6.6
    • SubModel: CLASSIC SPORT
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1979 OLDSMOBILE CUTLASS

    • Liter: 5.7
    • Aspiration: N
    • SubModel: VISTA CRUISER
    • Engine Vin: L
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1989-1991 CHEVROLET R1500 SUBURBAN

    • Liter: 6.2
    • SubModel: SCOTTSDALE
    • CUI: 379
    • EngineType: V8 ( 6.2 L / 379 )

    1973 PONTIAC LEMANS

    • CC: 6555
    • Liter: 6.6
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: R
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1969-1971 CHEVROLET C10 PICKUP

    • CC: 4801
    • Liter: 4.8
    • SubModel: BASE
    • CUI: 292
    • EngineType: L6 ( 4.8 L / 292 )

    1994 CHEVROLET K1500 PICKUP

    • Fitment_Note: w/OEM Hydraulic Roller Cams
    • Liter: 5.7
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: K
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1987-1993 CHEVROLET G10 VAN

    • CC: 5031
    • Fitment_Note: w/OEM Hydraulic Roller Cams
    • Liter: 5.0
    • SubModel: SPORTVAN
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1990-1996 CHEVROLET G30 VAN

    • Fitment_Note: w/OEM Hydraulic Roller Cams
    • Liter: 5.7
    • Aspiration: N
    • SubModel: SPORTVAN
    • Engine Vin: K
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1975-1977 CHEVROLET C20 SUBURBAN

    • Liter: 5.7
    • SubModel: SILVERADO
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1973-1974 CHEVROLET NOVA

    • CC: 5737
    • Liter: 5.7
    • Aspiration: N
    • SubModel: CUSTOM
    • Engine Vin: L
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1973-1974 CHEVROLET CAPRICE

    • CC: 5737
    • Liter: 5.7
    • Aspiration: N
    • SubModel: CLASSIC
    • Engine Vin: L
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1979-1980 CHEVROLET C30 PICKUP

    • Liter: 5.7
    • SubModel: CUSTOM DELUXE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1977-1979 FORD F-100

    • Liter: 5.8
    • Aspiration: N
    • SubModel: CUSTOM
    • Engine Vin: H
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1975-1978 GMC K1500 PICKUP

    • Liter: 6.6
    • SubModel: BASE
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1969-1971 CHEVROLET C10 PICKUP

    • CC: 5031
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 307
    • EngineType: V8 ( 5.0 L / 307 )

    1972-1974 FORD RANCHERO

    • CC: 5753
    • Liter: 5.8
    • Aspiration: N
    • SubModel: SQUIRE
    • Engine Vin: Q
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1988-1993 CHEVROLET C2500 PICKUP

    • Liter: 6.2
    • SubModel: SILVERADO
    • CUI: 379
    • EngineType: V8 ( 6.2 L / 379 )

    1960-1962 GMC 1000 SERIES PICKUP

    • CC: 4425
    • Liter: 4.4
    • SubModel: BASE
    • CUI: 270
    • EngineType: L6 ( 4.4 L / 270 )

    1974 GMC K35/K3500 PICKUP

    • CC: 4801
    • Liter: 4.8
    • SubModel: BASE
    • CUI: 292
    • EngineType: L6 ( 4.8 L / 292 )

    1987-1993 GMC G25/G2500 VAN

    • Liter: 6.2
    • SubModel: RALLY
    • CUI: 379
    • EngineType: V8 ( 6.2 L / 379 )

    1973 CHEVROLET LAGUNA

    • CC: 6555
    • Liter: 6.6
    • SubModel: BASE
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1980-1981 FORD E-250 ECONOLINE CLUB WAGON

    • Liter: 5.8
    • Aspiration: N
    • SubModel: CUSTOM
    • Engine Vin: G
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1968-1971 CHEVROLET CHEVELLE

    • CC: 5736
    • Liter: 5.7
    • SubModel: CONCOURS
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1976 CHEVROLET MONTE CARLO

    • CC: 5031
    • Liter: 5.0
    • SubModel: S
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1972 CHEVROLET TOWNSMAN

    • CC: 5737
    • Liter: 5.7
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: K
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1977-1979 OLDSMOBILE STARFIRE

    • Liter: 5.0
    • SubModel: SX
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1979-1986 GMC K3500 PICKUP

    • Liter: 4.8
    • SubModel: SIERRA CLASSIC
    • CUI: 292
    • EngineType: L6 ( 4.8 L / 292 )

    1973 GMC JIMMY

    • CC: 5031
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 307
    • EngineType: V8 ( 5.0 L / 307 )

    1993-1995 FORD F-150

    • EngineType: ALL
    • SubModel: LIGHTNING

    1958-1959 GMC 150 PICKUP

    • EngineType: ALL
    • SubModel: ALL

    1968 CHEVROLET K30 PICKUP

    • CC: 4801
    • Liter: 4.8
    • SubModel: BASE
    • CUI: 292
    • EngineType: L6 ( 4.8 L / 292 )

    1975-1976 CHEVROLET G30 VAN

    • Liter: 6.6
    • SubModel: HI-CUBE
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1973 PONTIAC FIREBIRD

    • CC: 6555
    • Liter: 6.6
    • Aspiration: N
    • SubModel: FORMULA
    • Engine Vin: R
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1982 CHEVROLET CAMARO

    • EngineType: ALL
    • SubModel: Z28 INDIANAPOLIS 500 PACE CAR

    1982-1986 CHEVROLET K30 PICKUP

    • Liter: 6.2
    • SubModel: CUSTOM
    • CUI: 379
    • EngineType: V8 ( 6.2 L / 379 )

    1979 GMC C3500 PICKUP

    • Liter: 6.6
    • SubModel: BASE
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1973 CHEVROLET CAPRICE

    • CC: 5737
    • Liter: 5.7
    • Aspiration: N
    • SubModel: ESTATE
    • Engine Vin: L
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1980 OLDSMOBILE CUTLASS SUPREME

    • Liter: 5.0
    • SubModel: BASE
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1975-1976 GMC SPRINT

    • Liter: 6.6
    • SubModel: BASE
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1970-1971 FORD TORINO

    • CC: 5753
    • Liter: 5.8
    • Aspiration: N
    • SubModel: GT
    • Engine Vin: M
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1994-1998 GMC C2500 SUBURBAN

    • Liter: 6.5
    • SubModel: BASE
    • CUI: 395
    • EngineType: V8 ( 6.5 L / 395 )

    1979 CHEVROLET MALIBU

    • Liter: 5.7
    • Aspiration: N
    • SubModel: CLASSIC LANDAU
    • Engine Vin: L
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1977 CHEVROLET C20 SUBURBAN

    • CC: 5031
    • Liter: 5.0
    • SubModel: SILVERADO
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1991 CHEVROLET COMMERCIAL CHASSIS

    • Fitment_Note: w/OEM Hydraulic Roller Cams
    • EngineType: ALL
    • SubModel: ALL

    1987-1996 GMC G35/G3500 VAN

    • Fitment_Note: w/OEM Hydraulic Roller Cams
    • Liter: 5.7
    • SubModel: VANDURA SPECIAL
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1987 CHEVROLET V10 PICKUP

    • Fitment_Note: w/OEM Hydraulic Roller Cams
    • Liter: 5.7
    • SubModel: SCOTTSDALE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1969-1971 CHEVROLET CAMARO

    • CC: 5736
    • Liter: 5.7
    • SubModel: RS
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1958 GMC PM252

    • EngineType: ALL
    • SubModel: ALL

    1982 FORD E-250 ECONOLINE CLUB WAGON

    • Liter: 5.8
    • SubModel: BASE
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1980 CHEVROLET MALIBU

    • Liter: 5.7
    • SubModel: SPORT
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1995-1996 GMC K1500 PICKUP

    • Liter: 6.5
    • SubModel: SIERRA SPECIAL
    • CUI: 395
    • EngineType: V8 ( 6.5 L / 395 )

    1973 GMC K25/K2500 PICKUP

    • CC: 5031
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 307
    • EngineType: V8 ( 5.0 L / 307 )

    1984-1986 PONTIAC BONNEVILLE

    • Liter: 5.0
    • SubModel: LE
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1987 GMC V1500 PICKUP

    • Liter: 6.2
    • SubModel: BASE
    • CUI: 379
    • EngineType: V8 ( 6.2 L / 379 )

    1978-1980 OLDSMOBILE CUTLASS SALON

    • Liter: 5.0
    • SubModel: BROUGHAM
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1966-1968 PONTIAC LAURENTIAN

    • CC: 6489
    • Liter: 6.5
    • SubModel: BASE
    • CUI: 396
    • EngineType: V8 ( 6.5 L / 396 )

    1998 GMC S15 JIMMY

    • EngineType: ALL
    • SubModel: SLE

    1969 GMC C35/C3500 PICKUP

    • CC: 5012
    • Liter: 5.0
    • Aspiration: N
    • SubModel: BASE
    • CUI: 305
    • EngineType: V6 ( 5.0 L / 305 )

    1995 GMC K1500 PICKUP

    • Fitment_Note: w/OEM Hydraulic Roller Cams
    • Liter: 5.0
    • SubModel: SIERRA SLS
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1998 GMC C1500 PICKUP

    • Liter: 4.3
    • SubModel: SIERRA SLE
    • CUI: 262
    • EngineType: V6 ( 4.3 L / 262 )

    1975-1977 GMC C1500 PICKUP

    • Liter: 5.7
    • SubModel: SIERRA GRANDE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )
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