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Old 07-20-2010, 10:51 AM
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Valve Springs

What is the stock seat and open pressure for valve springs on a 1970 chevy 350

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Old 07-20-2010, 11:38 AM
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I'm guessing but I would looking for 80-90 closed and 190-210 open.
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Old 07-20-2010, 03:22 PM
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what is the outside diameter of stock springs
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Old 07-20-2010, 03:29 PM
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1.25 in.
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Old 07-20-2010, 03:43 PM
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Stock diameter used springs usually go 60-70 lbs. 90-110 is optimum for hot hydraulic cams..
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Old 07-20-2010, 06:56 PM
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do you know what the inside diameter is
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Old 07-20-2010, 07:01 PM
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A CC replacement spring has an ID of .82, which should be close
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Old 07-20-2010, 07:30 PM
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i am rebuilding my 350 engine. I am having it bored 30 over and putting roller rockers with a camshaft around .437 lift. The machine shop told me to get valve springs with seat and open pressure one step up from stock. Do you think 80 pounds seat pressure and 200 pounds open pressure will work? I am using the engine for street performance.
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Old 07-20-2010, 07:39 PM
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Quote:
Originally Posted by chevytruck345
i am rebuilding my 350 engine. I am having it bored 30 over and putting roller rockers with a camshaft around .437 lift. The machine shop told me to get valve springs with seat and open pressure one step up from stock. Do you think 80 pounds seat pressure and 200 pounds open pressure will work? I am using the engine for street performance.
Competition Products # 98111 might be a better choice. They're 90# @ 1.7" installed height on the seat, 240# @ 0.500" lift- so would be slightly lower at your 0.437" lift.
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