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you must upgrade the springs or bad things will happen!
 

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Any.... any camshaft upgrade requires a valve train upgrade. Engine 101 basics.
 

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Yup, that covers it all. If you're going through the work of a cam swap, you don't want to scrimp on the springs or take shortcuts.
 

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Trick flow sells a good upgrade kit, which I stuck in. I had no problems with my springs with an e cam, though I didnt over rev it either. Valve float bad.......
 

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I have 10,000 miles on mine with stock springs and E cam.... no problems yet

My springs checked out okay on the rebuilt so I left them in
 

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agree with new8514. I have had two different mustangs with E303 cams and stock E7 heads and springs. I put over 100,000 miles on both of them that way.

There are times when different cams require new springs, but the E cam is not radical enough to justify it for me.
 

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good luck running stock springs with the e 303 cam , when you drop a valve let us know, valve float then dropped valve, just a matter of time!
 

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I don't see myself floating any valves, my car doesn't see over 5000 rpm and wont until it gets heads and an intake, and then it will get new springs....
 

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I have 10,000 miles on mine with stock springs and E cam.... no problems yet

My springs checked out okay on the rebuilt so I left them in
Me too.Mine are fine so far.E303,stock springs,AND,flat top pistons.

I'm living on the edge.
 
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