valve spring life span

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Aug 20, 2019 | 08:55 PM

c4boom

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From: Pittsfield NH

valve spring life span

I was just wondering what pepole have seen for valve spring life span with cams in the 235 239 and 0.623 0.626 lift range. Also what tends to hapen when a spring brakes with pac duel springs.

Aug 20, 2019 | 10:33 PM

Ls7colorado

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From: Henderson, TN

if a spring breaks you will normally trash the head and that piston/cylinder, possibly the entire engine

Aug 20, 2019 | 10:59 PM

wannafbody

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Dual springs offer more protection. Some people check them at about 20K but someone here ran a set for 50K without issue.

Aug 20, 2019 | 11:06 PM

c4boom

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I have 34k on a set of pac 1206x springs at the moment. Starting to think about swaping them.

Aug 21, 2019 | 02:06 AM

pdxmotorhead

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In road racing, with a GT level engine, the springs get swapped about twice a season at the Amateur level..
They don't typically hold their pressure uniformly much longer than that. that's about 8 track weekends.

On a sprint car the springs get checked about every 8 to 10 race weekends. (406 small block running north of 9500.. )