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Bored&Stroked · 03-17-2017, 11:26 AM

There are also different spring pressures on the same length (longer springs). I've seen some that come in around 40# (stock Ford) and then sometimes you'll see somebody using what was known as the Lincoln Zephyr spring - which will be 10 - 15 lbs heavier on pressure. The Isky 185-G single spring will be approximately 30 - 40 lbs heavier . . . and is usually only needed on really big cams (high lift), on race style engines where you are revving the engine over 5000 RPM, and/or with things like roller tappets (roller cams - which are extremely rare).

As Ron said, having lighter spring pressure does reduce wear in the valve train - if you don't need it, don't use it!

03-17-2017, 11:26 AM	#10
Bored&Stroked Senior Member Join Date: Jan 2011 Location: Central Ohio Posts: 5,062	Re: flathead valve springs Q... There are also different spring pressures on the same length (longer springs). I've seen some that come in around 40# (stock Ford) and then sometimes you'll see somebody using what was known as the Lincoln Zephyr spring - which will be 10 - 15 lbs heavier on pressure. The Isky 185-G single spring will be approximately 30 - 40 lbs heavier . . . and is usually only needed on really big cams (high lift), on race style engines where you are revving the engine over 5000 RPM, and/or with things like roller tappets (roller cams - which are extremely rare). As Ron said, having lighter spring pressure does reduce wear in the valve train - if you don't need it, don't use it!