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Author Topic:   valve spring ?
posted May 21, 2003 11:55 PM
115 at seat and 300 open is what I just installed in my 350 with howards cam 410/410 lift,288 duration advertised and 230 @ 50, howards said these springs are recomended with this cam? Will they be strong enough for the application and if so if I change cams how big cam could I run?

posted May 22, 2003 12:02 AM
If your cam, any cam, manufacturer told you that those springs are good for the cam in question. Then yes, I'd say they are OK. Although don't count on all the springs exactly matching the pressures they say they do.


posted May 22, 2003 10:33 AM
I run up to 130 to 140 spring seat pressure and 550 to 570 lift. solid.....your spring pressure would probaly allow you to run a bigger cam what you need to look for will be coil bind....roll your engine over now check a valve that is completely open and see what kinda clearance you have between the coils on the valve springs....That should give you some idea if you think you can go with more lift on those springs.....Towman

[This message has been edited by towmandan (edited May 22, 2003).]

posted May 24, 2003 12:31 PM
You need to know your Installed height on the valve spring.

if its around 1.750 then subtract your lift of the cam, ".410"

you will then have the measurement of 1.340 & most spring pressures are listed at 1.250 for bigger lift cams.

It would be best to take your springs to a machine shop & check the pressure at 1.340 so you would know the pressure of them for your .410 lift cam.

The pressure is less with the smaller lift.

hope that helps some,

[This message has been edited by ruggs66 (edited October 17, 2003).]

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