Valve Spring Pocket Clearance
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  1. #1
    Official RnS Addict heavychevy's Avatar
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    Valve Spring Pocket Clearance

    I am fitting different valve springs and they are slightly bigger diameter. They take up nearly all the clearance in the pockets in the head. Best described as a snug fit Will this be ok? How much clearance is needed? Heads are ally and there are the steel bottom retainer shim things there.

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    Nowheresville JackGriffin's Avatar
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    Do the spring manufacturers give any figures? What about the retainers - are they bigger to suit the springs? I guess aluminium heads will eventually wear to the correct size if they are a bit tight

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    Official RnS Addict heavychevy's Avatar
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    I've struggled to find a figure, I e-mailed them and they said "as long as it is at least zero they will work fine". This didn't fill me with confidence so I am looking for other opinions. The top retainers are new to suit the springs. I also figured the springs would win in a battle with the heads. The fit is that snug that I have to find which end of the springs are the best fit as one always seems to be a bit wider. I am reusing the bottom shim/ inner retainer.

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    Administrator blackpopracing's Avatar
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    I'm no expert so only take my advice lightly, but if the springs don't actually bind/grip the ally pocket then I think you are ok.

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    Official RnS Addict Slamera63's Avatar
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    I would check that they are seating down properly, and also check the inner clearance of the valve stem seal to the spring because sometimes they need an alternative stem seal that may require some machining.
    It's only funny till someone gets hurt..........then it's friggin' hilarious

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    Official RnS Addict Perfect65's Avatar
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    When double valve springs were/are used they actually rubbed slightly and were contra wound so the coils didn't actually jam together. The reason for them touching was to control spring surge at high revs so I am told (Quote - Phil Irving "Tuning For Speed"). Perhaps your set up will also control spring surge but anyhow it would seem slight friction not to be a big issue.

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    Official RnS Addict WB54's Avatar
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    clearance it. If the spring binds on the head, you'll damage followers, pushrods or gouge the cam. you could do it quick and dirty with a die grinder or properly and mill them oversize and concentric to the valve guide.

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    Official RnS Addict heavychevy's Avatar
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    The valve springs seem to vary in diameter, they are Crane 99876. I fitted a couple more today but had to reject one as neither end would fit. The present plan is to buy another half dozen and hope i get enough small diameter ones to make a full set that don't bind with the head.

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    Official RnS Addict Perfect65's Avatar
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    Quote Originally Posted by WB54 View Post
    clearance it. If the spring binds on the head, you'll damage followers, pushrods or gouge the cam. you could do it quick and dirty with a die grinder or properly and mill them oversize and concentric to the valve guide.
    This is looking like the best move if the springs you are getting vary to that degree. Bore out the pockets to clear the maximum size spring you are likely to get and then you need worry no more and you will be ready for the next rebuild.

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