Valve Spring Upgrade

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Jan 3, 2012 | 08:07 PM

ilovemy60ford

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Valve Spring Upgrade

I'm building a new motor for the truck, and thought I'd include the springs and retainers that Comp recommends for my 252H Cam. Spring 942-16.

Specs say seat pressure - 115# @ 1.7". I'm guessing this is installed height?
Bind height is 1.125". So my thinking is, .433 lift cam with 1.6 rocker arms will yield about .692" lift. So if it installs at 1.7", at lift it would be bound???

The other figure is Open load: 284lbs @1.200".

So long story short, what is the desired height on these? Heads are E7TE.

Jan 4, 2012 | 12:48 PM

Muv

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Joined: Jul 2003

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I believe that you have misinterpreted Comp Cams lift, the 0.433" is the valve lift not the cam lift. At .433" lift the recommended spring would work out OK.

Sorry, I can't give you a spring height.

Jan 4, 2012 | 03:11 PM

Ken(Ark)

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Your lobe lift on this cam is .270 X 1.6 = .433 at the valve .

The duration of this cam with some flat top pistons will give you a noticable pep to your motor . You will not notice the extra lift that 1.7 rockers will produce over the stock 1.6 . Buying 1.7 rockers would be an expense with little advantage .

Roller block 302's are common and very resonable priced right now . You can gain 25 horsepower just from the fricion that is not lost on flat lifters .

Jan 4, 2012 | 09:01 PM

HemiEater

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most stock heads are setup @ 1.8 I think you would be fine.. just install the spring and keep any shims in the same pocket.. you will be fine with that cam