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Old 03-20-2011, 12:57 PM
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Caddy 472 valve spring Question?

Currently I am taking apart two 472 Cadillac engines to build one. Looking at the Comp Cams catalog they list the same valve springs used in SBC applications. Has anyone out there done this. Do SBC 1.250 diameter springs and retainers, locks work on the Cadillac valves? Both are 11/32 stems and physically looking at the valve locks, they look the same. Would like any additional info. Thanks.

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Old 03-20-2011, 02:18 PM
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I'm right in the middle of building a 508" Cadillac, I will admit that I'm new to the Cadillac build arena and am reading everything I can about them.

So far as I can tell yes the chevy springs will work but most guys just use the single spring that MTS (Maximum Torque Specialties) uses. It is 120 closed and 320 open, I questioned them about it not having a damper spring and they said they use it for all their performance street builds and it works just fine.

Again, you have to realize that most of these guys don't rpm these big monsters over 5500 rpm so valve spring life is not a problem. For further VERY GOOD reading go to thier website at and look at the forum talk, there are some unbelievable big Cad engines being built.
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Old 03-20-2011, 09:43 PM
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The SBC Z28 springs are a good and inexpensive way to upgrade the Caddy BB heads.

What are the years of the Caddy engines that you have? Do you happen to have the casting #s? is Richard Potter's site. He's one of the top Caddy engine builders in the country, but not the only one of course.
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