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NOT sure what you are asking ??...??

It is a fast burn head .. like you said ....also great for A/F mixing(swirl) ... but THUS it is not a higher rpm good-flowing head.

There are some well-versed A engine guys on here that can maybe give you more detailed info on them.



sorry bro, i meant to your answer to MPG, i don't have familiarized with this term, what it means?
thanks

xASESINOx