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Discussion Starter · #1 ·
i have a 99 summit x 670. i was just wondering if there is any way to tell if mine is an H.O or just a regular 670. it doesn't say H.O. on the hood so i am wondering if there is anything on the block like an engine I.D. i can use to tell.
 

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Summit X was indead HO motor. The summit had bit different timing than the MXZ 670ho. Maybe pipe too but been awhile since I knew the info.
 
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i believe the 670 ho motor has an x stampted in the head between the cyilinders if im correct. also 99 was the only year for the 670 ho engine if im correct. i think i am anyways ha ha.
 

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670x was also 98`, and yes the exhaust is different on the 98-99. very good running motors, mine has been
reliable, until I swapped out for a 700 triple.
 
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