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  1. #1
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    Help with port map options

    Help with port map options , needing help with picking port timing changes to move rpm range up and make has much power as possible. . I've got a 1985 merc XR2 2.0 I've learned it doesn't have finger ported pistons or block.. so far I've got chest work cut , and rod slots cleaned up. Going to D port pistons also. Click image for larger version. 

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  2. #2
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    Take ya finger in the top of Exhaust port. Feel the sharp cut..... round rat tail till smooth.

  3. #3
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    I am not talking about the top of port for timing but the sharp edge of the bend in the port.

  4. #4
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    Thank you Dave s I'm guessing that would help flow lil bit to round that sharp corner.. I'll need to be careful on the bore not to get out there

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