Do I have the Right Size Valve Spring Seat Cups?? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 01-16-2011, 08:58 PM
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Do I have the Right Size Valve Spring Seat Cups??

I recently ordered a set of bare EDL aluminum heads (#60059) from SUMMIT for my '63 T'Bird 390 4V. I also ordered a set of EDL valve spring seat cups (#5771) for my 1.50" OD valve springs that are part of a cam update planned with the new heads. The seat cups were back-ordered for a couple of weeks, but came yesterday. The cups fit the machined seat areas of the head and the valve guides perfectly.

My question is concerning how close should the ID (lip-to-lip) of the cup match the OD of the spring? My springs mic 1.50" (+/- a gnats whisker) OD. That is the reason I ordered the EDL-5771 seat cups - SUMMIT states that they are for 1.50" OD springs. However, all of the cups mic 1.55" (+/- a gw) ID lip-to-lip and the instruction sheet states: "The spring seat/cup has a register for the O.D. of the valve spring that has a 1.550" dia...".

Bottom-line is that I have 1.50" OD springs and 1.55" ID seat cups. Is this too much difference? Is it anything to be concerned about enough to look for cups with a ID closer to 1.50" or are these O.K. as is?

You opinion and advice is appreciated.

Thanx,

texastomeh

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Old 01-17-2011, 04:09 AM
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A +0.050" difference in the spring cup's ID to the spring's OD is perfectly acceptable.
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Old 01-17-2011, 01:24 PM
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A +0.050" difference in the spring cup's ID to the spring's OD is perfectly acceptable.
THANX!!

THAT is what I really needed to know!!

texastomeh
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