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About sspeed

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    cylinder head mods

    Hi Coeshow, With your cam design, converting a 150- 251cc to achieve 29hp, what head do you use? a stock 150, modified 150, or a stock 230. If the 150 head requires modification assuming $150-$250 for machining, would it be more cost effective to pick up a stock 230 head for less than $150? I'm assuming the 150 valves, springs, rockers all swap over to the 230 head. Thanks :bonk: