The RPM is much better than the performer or P4B Q jet flange, Especially ported, you will gain 10hp up top but lose 10ft lbs down low with a 1" open spacer, a 1" open spacer will net you your best et's and you will be right there with a T2 that is untill the T2 is fully ported with a 1" open spacer fwiw
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Just another Engine Builder from the Northwest lol
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