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Max lift on LT4 valve springs?

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Old 08-10-2018, 01:39 PM
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Max lift on LT4 valve springs?

LT4 valve springs are rated at max lift .525 if I remember right. Is .528 pushing it? I assume not but just want opinions from more knowledgeable folks. Looking at CC501 w/ 1/6 rockers.
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Old 08-10-2018, 03:10 PM
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Re: Max lift on LT4 valve springs?

I can't remember what LT4 spring max lift is but if it is .525 than .528 is flat out coil bind...so yeah that would be a problem. You ideally want about .030 margin before coil bind

LT4 springs are barely enough for the GM hot cam and if they already have mileage on them with standard LT1 valves they are done. They were designed to work with the sodium filled valves (lighter) on the LT4. They are a "OK" spring on a LT1 with a stock cam but that is about it
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Old 08-18-2018, 02:12 PM
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Re: Max lift on LT4 valve springs?

My car has the LT4 springs and 1.6 roller rockers and it flots the vales at 5800 rpm with the stock cam, IMO those valvesprings are junk.
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