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Author Topic: big f med riser heads  (Read 1239 times)

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wayne

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big f med riser heads
« on: August 13, 2019, 01:54:57 PM »
How are big f med riser heads differant from small f ones.
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Katz427

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Re: big f med riser heads
« Reply #1 on: August 13, 2019, 05:50:03 PM »
Blair Patrick once related that the big F heads had a bigger 164 cc intake port as  compared to the small f heads which were 153 cc. He also said you can't port a small f to a big F size without hitting water. Different intake port core.
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ntheogen

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Re: big f med riser heads
« Reply #2 on: August 13, 2019, 10:38:44 PM »
The combustion chambers are different as well.
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