Board index Flathead Power-Technical Questions, Answers, and Suggestions Servi-Cars replacement heads

replacement heads

Post Sat Mar 12, 2022 7:55 pm

Posts: 187
good morning . . .where ever u are. . .

i just got a set of 45 heads delivered from Flatland Motorcycle/45Parts depot.
i ordered #5 heads beacause i was told the #6 heads gave me 12mm clearence and i have one valve that measures close enuff to that to cause my nervs to twitch.
the #5's have lots of room for the valves.

my question to the forum is. . .what sort of performance difference should i expect to see with 5's compared to 6's?

debateing about getting the 5's shaved. not sure it is worth it.


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