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Old 06-25-2004, 05:52 PM
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stock springs with bigger cam

i just got my new comp cam camshaft. it a magnum 270h with .470 lift. i was wondering if a new set of stock springs would hold up to this cam? what are the ratings on stock springs?
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Old 06-25-2004, 05:53 PM
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i would get better springs anyway.
better safe than sorry.
plus they don't cost a fortune
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Old 06-25-2004, 07:00 PM
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i know going with better than stock springs would be what most everyone would say, but will the new stock springs still work?
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Old 06-25-2004, 08:25 PM
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With that cam your gonna need them to help take care of valve float
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Old 06-25-2004, 08:28 PM
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They will work without coil bind, but your upper RPMs won't be as strong as they could be.
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Old 06-25-2004, 10:20 PM
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stock springs

i had stock LT1 valve springs with my 480 lift cam they worked but floated valves at high rpm
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Old 06-25-2004, 11:23 PM
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Take the stock ones back if you've already got 'em. The correct springs for that cam will only cost you about $20 more, if that much. You'll be glad you did.

Larry
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Old 06-26-2004, 11:35 AM
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i havent bought the springs yet, but will here in the next week or so. how high of rpm's would cause the valves to float? ive never turned this 400 past 5200rpm with the current 327/350hp cam thats in it. also could this new cam increase my rpms, and valve float is when the valve slams back onto the seat then bounces off a little, right?
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Old 06-26-2004, 11:45 AM
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Quote:
Originally posted by camino_man
i havent bought the springs yet, but will here in the next week or so. how high of rpm's would cause the valves to float? ive never turned this 400 past 5200rpm with the current 327/350hp cam thats in it. also could this new cam increase my rpms, and valve float is when the valve slams back onto the seat then bounces off a little, right?
In my opinion anything over 5000 rpm is risky with stock springs.
Valve float is anytime that one vavle train part looses physical contact with it's mating part be the lifter to cam lobe, push rod to lifter, pushrod to rocker arm, retainer to lock, ect whether it bounces or not.
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Old 06-26-2004, 12:56 PM
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Quote:
Originally posted by tresi
In my opinion anything over 5000 rpm is risky with stock springs.
Valve float is anytime that one vavle train part looses physical contact with it's mating part be the lifter to cam lobe, push rod to lifter, pushrod to rocker arm, retainer to lock, ect whether it bounces or not.
I used to spin my stock Ford 302 past 6,500 RPMs all the time. All that engine had was a cam, intake, headers, and carb. It started floating valves around 6,200. The pistons eventually hit the valves at around 7,200 RPMs. The heads on the engine had stock springs with around 80,000 miles on them.

My point is that there is no scientific point where springs are going to stop doing what they are supposed to do. It is all a gamble. What you get from the right springs is cheap insurance. Do you want to destroy a perfectly good engine or heads with your stock springs? Or is it worth $20 to have a set of springs that greatly decrease the chance of catastrophe?

The above theory holds true to anything in high performance engine building.
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Old 06-26-2004, 04:03 PM
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I wouldnt run it with stock springs. I did the same thing and ended up with bent pushrods and wore out rockers and studs because of weak springs and valve float. I would rather pay for new springs than new studs and rockers....

I wouldnt run it with stock springs. I did the same thing and ended up with bent pushrods and wore out rockers and studs because of weak springs and valve float. I would rather pay for new springs than new studs and rockers....
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Old 06-26-2004, 04:35 PM
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thanks for all the info, i reckon ill go with a matching set of springs from comp.
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