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I'm looking at getting a new cam for my 302, and the comp cams site says that the recommended spring is 1.437" OD. Does anyone know what the stock dia. of stock 289/302 heads is? Will I probably need to machine the heads to get the springs to work? Thanks.
 

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Any time you are installing new valve springs you need to make sure the valves are set up properly. A dial mic is used to check all the valve spring installed heighths. If they are off you either shim up or cut the flats underneath the valve springs down depending on which way you need to go.
 
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