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#1
03-24-2025, 11:14 PM
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L72 L78 LS6 Solid Lifter valve spring recommendation
Looking for updated advice/recommendations on what valve springs to use with a factory solid lifter big block cam.
I have an NOS GM 143 solid lifter cam that I will be installing in a 1970 L78 motor. I don't plan to go over 6000 RPM. It's a 4:10, 4-speed car. I searched on here, but all the discussions were old, and most referenced the Crane Valve springs, who, unfortunately no longer exist. Thank you for the help!
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Scott Kiehne 70 SS L78 Camaro, born with drivetrain, 4:10's & M22, Classic Copper, Concours Restored. 70 SS L78 Camaro, Antique White w/Bright blue interior, 4:10's & M21. 
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#2
03-25-2025, 12:14 AM
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About 15 years ago i replaced the valve springs on my 66 L72 Corvette engine with GM part #12371061. Label said GM performance parts with the part #.
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#3
03-25-2025, 12:30 PM
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Quote:
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Dave Dykstra 1968 Camaro Palomino Ivory/Ivy Gold interior -Delivered to Courtesy Chevrolet, Los Angeles, CA 2013 Corvette Grand Sport 60th Anniversary Edition Arctic White/Diamond Blue interior -Delivered to Bill Jacobs Chevrolet, Joliet, IL NCRS#66003 Speed has never killed anyone. Suddenly becoming stationary, that’s what gets you. – Jeremy Clarkson. Dykstra Motorsports
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#4
03-26-2025, 04:53 PM
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Thank you for that info. I searched the GM part number above but came up empty. It appears to have been discontinued 10+ years ago already. I didn't find any part number it was superseded by.
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Scott Kiehne 70 SS L78 Camaro, born with drivetrain, 4:10's & M22, Classic Copper, Concours Restored. 70 SS L78 Camaro, Antique White w/Bright blue interior, 4:10's & M21. Last edited by MN 70L78; 03-27-2025 at 04:50 PM.
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#6
03-28-2025, 01:22 PM
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The individual spring part # is 3970627. Part # i posted was a package of 16 springs from the performance parts catalog. Maybe this individual part # can help.
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#7
03-28-2025, 09:03 PM
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Quote:
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Scott Kiehne 70 SS L78 Camaro, born with drivetrain, 4:10's & M22, Classic Copper, Concours Restored. 70 SS L78 Camaro, Antique White w/Bright blue interior, 4:10's & M21.
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#8
04-07-2025, 12:22 AM
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I have 2 sets of the NOS # 3970627 Valve Springs
Purple and Green stripes And think I also have the factory retainers If interested give me a call. 6o8-751-0509 Joe
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| The Following User Says Thank You to hiperf69 For This Useful Post: | ||
enio45 (04-07-2025) | ||
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