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Proform Aluminum Roller Rockers for Small Block Chevy with 1.5 Ratio & 3/8" Stud

778-66907


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Proform 66907
$142.99
More than 10 available
Aluminum Roller Rockers
  • Small Block Chevy
  • 1.5 Ratio
  • 3/8" Stud
  • 16/pkg
  • Free Shipping - Ships
    Save $10 off $299, $20 off $599, $30 off $799, $100 off $1,599 Orders. Promo Code: SUMMERFUN exclusions apply
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    Does Proform 66907 fit your vehicle?

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    1983 GMC JIMMY

    • Liter: 5.7
    • SubModel: BASE
    • Aspiration: NATURALLY ASPIRATED
    • CUI: 350
    • Engine Type: V8 ( 5.7L / 350 )
    • Engine Vin: L

    1972 CHEVROLET CHEVELLE

    • Liter: 5
    • SubModel: NOMAD
    • Aspiration: NATURALLY ASPIRATED
    • CUI: 307
    • Engine Type: V8 ( 5L / 307 )
    • Engine Vin: F

    1972 CHEVROLET K10 PICKUP

    • Liter: 5.7
    • SubModel: BASE
    • Aspiration: NATURALLY ASPIRATED
    • CUI: 350
    • Engine Type: V8 ( 5.7L / 350 )
    • Engine Vin: J

    1970 CHEVROLET CHEVELLE

    • Liter: 5.7
    • SubModel: CONCOURS ESTATE
    • Aspiration: NATURALLY ASPIRATED
    • CUI: 350
    • Engine Type: V8 ( 5.7L / 350 )
    • Engine Vin: -

    1957 CHEVROLET BEL AIR

    • Liter: 4.6
    • SubModel: BASE
    • Aspiration: NATURALLY ASPIRATED
    • CUI: 283
    • Engine Type: V8 ( 4.6L / 283 )
    • Engine Vin: -

    1982 CHEVROLET IMPALA

    • Liter: 5.7
    • SubModel: BASE
    • Aspiration: NATURALLY ASPIRATED
    • CUI: 350
    • Engine Type: V8 ( 5.7L / 350 )
    • Engine Vin: K

    1970 CHEVROLET CAPRICE

    • Liter: 5.7
    • SubModel: BASE
    • Aspiration: NATURALLY ASPIRATED
    • CUI: 350
    • Engine Type: V8 ( 5.7L / 350 )
    • Engine Vin: J

    1977 GMC SPRINT

    • Liter: 5.7
    • SubModel: CLASSIC
    • Aspiration: NATURALLY ASPIRATED
    • CUI: 350
    • Engine Type: V8 ( 5.7L / 350 )
    • Engine Vin: V

    1969 CHEVROLET NOVA

    • Liter: 5
    • SubModel: BASE
    • Aspiration: NATURALLY ASPIRATED
    • CUI: 307
    • Engine Type: V8 ( 5L / 307 )
    • Engine Vin: -

    1975 CHEVROLET LAGUNA

    • Liter: 6.6
    • SubModel: BASE
    • Aspiration: NATURALLY ASPIRATED
    • CUI: 400
    • Engine Type: V8 ( 6.6L / 400 )
    • Engine Vin: U

    1990 GMC JIMMY

    • Liter: 5.7
    • SubModel: BASE
    • Aspiration: NATURALLY ASPIRATED
    • CUI: 350
    • Engine Type: V8 ( 5.7L / 350 )
    • Engine Vin: K

    1983 GMC JIMMY

    • Liter: 5.7
    • SubModel: BASE
    • Aspiration: NATURALLY ASPIRATED
    • CUI: 350
    • Engine Type: V8 ( 5.7L / 350 )
    • Engine Vin: E
    66907 is rated 3.6 out of 5 by 5.
    Rated 3 out of 5 by from Proform unknowns went from stamped roller tip to full roller rockers. good move I belive, although didn't realize these were chineze made. seems that might have mattered when purchased. they are installed in small block chevy 4x4 with mild comp cam. we'll see how it works.
    Date published: 2018-01-27
    Rated 1 out of 5 by from Dont Buy Bought these back in August. Since then I've only put 1000 miles on my truck. In no way did I run this engine hard. But last week the engine started making a banging sound. Opened up the valve covers to find that the rocker was broke in half. And all of my push rods are shaved. They touch the sides of the guide plates. I'm not sure if they need a different push rods or some extra piece for the valve. Idk. Learn from my mistake.
    Date published: 2018-03-15
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    will these rockers work on a 1995 lt1 one with aluminum heads

    Asked by: sonoma
    No, you would want a self-aligning roller rocker for that application.
    Answered by: Matt_B
    Date published: 2018-03-03

    I already own these rockers and I'm planning on doing a vortec swap. what modifications will need to be made in order to run these rockers on a vortec head

    Asked by: 83k10chevy
    These are not able to be used in a Vortec application as they are not self aligning rocker arms.
    Answered by: Flanary
    Date published: 2017-08-28

    Will these rockers work with a hydraulic flat tappet cam with out having to get different push rods

    Asked by: Mike717
    Yes as long as they are 1985-older cylinder heads
    Answered by: SteveM
    Date published: 2017-08-22

    Are the rockers self aligning? Will they work on Cast iron Vortec heads?

    Asked by: Pdunner
    This part number is not self-aligning and will not work with cast iron vortec heads without modification. The correct part number you need is either 778-66915C or 778-66914; the difference between the two is the ratio.
    Answered by: Tech Support
    Date published: 2017-08-09
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    Some parts are not legal for use in California or other states with similar laws / regulations

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