Sounds like Schneider is grinding a mild hotrod cam for you? They won't actually "make" the springs, they'll just match up size & the required pressure for their cam grind- so you need the installed height between the head and retainer, and the OD of the spring- if there's room in the head, they can use a larger OD spring. If it's hotrod setup, the stock pressures and such aren't what they want, they need the dimension they have to work with to match up springs that will work. If they set you up with a double spring setup (did you mean double pressure or double springs?) you may need to cut down the OD of the guide and use PC type seals to clear the ID of the springs. Doesn't seem like they should need to spec doubles unless you're building a serious hi-rpm engine. The springs you end up with will probably be from a car engine, that dimensionally fit in your 301, but meet the pressure requirements of your new cam
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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