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Mercruiser 400 cyclone info needed

Old 01-14-2017, 05:56 PM
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Default Mercruiser 400 cyclone info needed

I have a 1984 ,mercruiser 454/400 cyclone serial number 6668656 ,I'm looking for the cam specs and what valve springs We're used , I'm sending the heads out to be freshened up and was hoping someone could help me out .thanks in advance.chris
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Old 01-14-2017, 09:08 PM
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It's a Crane 132561 cam. Crane spring number is 99893-16. Springs are set up at 115/340 lbs.
Here's the specs
http://www.cranecams.com/product/car...detail&p=24005

Last edited by picklenjim; 01-14-2017 at 10:01 PM.
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Old 01-14-2017, 09:14 PM
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Good engines. The only difference between those, and the "420HP" versions, was the 420's, had a Gil exhaust, holley double pumper, and single plane intake.

Pickles got you covered on the original crane cam they came with.
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Old 01-15-2017, 12:02 PM
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Thank you very much for the info ,info was a huge help
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