Does this port need opened up?
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Engine, Not Motor
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The stock TII iron has a very small primary as well. I don't know off hand if they are exactly the same, but they are damn close. Somewhere there's a stock port timing chart around...
That ported TII iron is ruined for sure. Personally, unless you are going for high power levels (400HP), I recommend you keep the primary porting very conservative. My typical example of this are the primary port timings on the Mazdatrix 6 port NA template. It just brings the port up and down a bit, not even really changing opening timing (maybe a few degrees by moving up).
That ported TII iron is ruined for sure. Personally, unless you are going for high power levels (400HP), I recommend you keep the primary porting very conservative. My typical example of this are the primary port timings on the Mazdatrix 6 port NA template. It just brings the port up and down a bit, not even really changing opening timing (maybe a few degrees by moving up).
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