I have a few questions that mabye someone here can answer. First can someone please tell me the difference on allpro heads in the -2 and -4 persay in 286-2 and 286-4. second we are looking at buying and new motor for next year for running half mile and are looking at either the gb2300 or a 286-2 or 286-4. anyone with thoughts or experiance with all three?
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