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Old 10-24-2002, 09:10 AM
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Post valve springs

i have a 350 and am upgrading the cam to a 487 life intake and a510 exhaust. if i put in LT1 valve springs will they be good enough. please help, why do i even need to change the springs. what would happen if i didnt?

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Old 10-24-2002, 04:55 PM
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your lt-1 springs will be borderline at 512 lift you will have to check for coil bind also check to see that the retainer and seal don't contact each other at full lift. i would go for something like a PBM 550 spring it has good seat pressure and is easy on cams, you must check all clearances or you will experience sharp biting pains in the rear wallet area.
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Old 10-24-2002, 04:58 PM
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LT1 valve springs should be plenty, but taking a risk isn't worth saving a couple bucks. Let me tell you what i think would happen IF you broke a valve spring. Step 1. The valve spring breaks. Step 2. The valve retainers let loose. step 3. The valve drops down onto the top of the piston. step 4. i'll let you imagine what happens next with a valve sitting on top of the piston going up and down at least 500 times per minute--I'm not sure but that's my best guess.--as far as i could guess-this is not a good situation
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Old 10-28-2002, 04:50 AM
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A valve is a terrable thing to loose. I have this mental image of this poor valve dancing for its life on top the that piston, simply horrable.
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Old 10-28-2002, 04:45 PM
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Springs are probably the hardest working component in your engine, they also lose seat pressure or wear out the quickest. If you are rebuilding the motor already you should replace the springs particularily if a larger than stock cam is going in too.

Why? if you don't the engine will valve float sooner and the fatigue life of a spring is finite, why take a chance.
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Old 10-28-2002, 05:33 PM
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Coil bind,seat pressure,valve float.If your springs ain't strong enough you'll loss high rpm potential cause of valve float.If they coil bind you'll either break a lifter of wack a lobe off.Also don't go to big to strong a spring makes it harder on valve train to lift the valve open.
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