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03-14-2011, 09:55 PM
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930-16 valve springs 454?
I have a 454 with large oval 215 casting heads. The heads currently have comp 911-16 single valve springs with a outside diameter of 1.524. I'm changing the cam and want to use the comp 930-16 dual valve springs with an outside diameter of 1.550. I have heard that the spring pockets may need to be enlarged, will these springs fit the stock heads without machining? Thanks.
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03-16-2011, 03:42 AM
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Seats may have already been machined larger, stock Springs are 1.437" or so.
Those are only .013" larger per side but, you should measure the Seats.
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