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    mercruiser 470 compression

    Thanks to all that responded to my question about hard turnover on my 1978 470. My question this time is what should the compression PSI be on this engine, I checked it and it had 125 psi on 3 and 127 on the 4th, is this within specs for this engine? Thaks for your help!
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    Mercruiser 470 hard to turn over

    I am purchasing a Mercruiser 470? 4 cyl. 170 HP. from a mechanic friend. This engine is very hard to turn over on start up ( he told me to get at least a 950 cold crank battery). My buddy says that it has always been this way since he owned the boat (12 years ) He has replaced the starter...
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