Search results

  1. N

    3 vs 4 blade

    I have a 18' Campion w/ aluminum 3 blade 21p x 14.25'' and @ WOT I get 4400 rpm ( 3800-4200 suggested) at a top speed of 48 mph. If I were to go to a SS 4 blade how much pitch would I need to drop to and still keep my 4400 rpm? I'm hoping a 4 blade will give me better fuel economy at cruise!
  2. N

    Mercruiser 470 Exhaust Manifold/Riser

    I have older 1979 470 and would like to change out the exhaust manifold and riser to the newer aluminum version. Can anyone tell me what problems I will run into before I spend any money on new ones. I'm doing it for weight savings, but wonder if the newer style ones flow better!
  3. N

    470, 485, 488 camshaft???

    Do all 3.7L mercruisers share the same camshaft? It seems there are alot of different ideas on the powerband of this engine. Mine is a 1979 470 and says 3800-4200rpm on the valve cover and some people say 4200-4600rpm ??? New to 3.7L's
Top