What prop should I use

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What prop do you have now, how many rpm's are you turning at WOT, and what is your WOT speed?

That should tell us if you are over or under propped.
I have had much better results with the black steel series. Check eBay for these, they are available cheap. I got mine for $75 new! I am currently running a 15 3/4 X 15 and I have a 13 3/4 X 17 as a spare. I like the 15 better because it seems to hold plane at lower speeds and it gives better mid range bite.

See my 2120 site prop page at


Bmail me for more discussion. I have an F150 also. I love that motor!