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  1. 7

    mercruiser 4 cylinder 3.0 head vs 2.5 head

    Hi all, Could anyone tell me if i could use a 3.0 head on a 2.5 block? The only difference I can tell is the valve size, since im going bigger head to smaller block displacement it should be ok correct?
  2. 7

    Engine swap

    Hey guys, I am swapping out my 1977 Glastron 140 hp engine for a 1971 120 hp and need some input from the vets. 1. I am leaving the out drive from the 140 as im told it should be the same ratio, however iv'e noticed that the coupler on the flywheel is smaller on the 120. Should i use the one...
  3. 7

    1977 Glastron Low compression, spitting oil, clacking sound

    I have a 1977 Glastron with a 140 HP 4 cylinder Mercruiser. Oil has been leaking out of my PCV tube and creating quite a mess on my carb and down the engine block. I have been hearing a clacking sound which I believe is coming from the valves and is only heard under a load or at full throttle. I...
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