91 should be fine with what U got. Run it check the plugs. If not some octane boost from Lucas. I got 13:1 run AV from the airports n do use Lucas because AV is dry. But on the lakes when I don't have AV or Race I run 93 with double octane boost n it's just fine. Just my two cents. Good luck


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All this big ford talk is making me drool. 😈

Anything you have to do to purchase fuel there?? Or just go and fill up?

They'll let you pull your boat out there, I usually just take cans. There's a card reader at the tank, so it's pretty much serve yourself.

Did I miss the exhaust type somewhere?

I think that cam will build a lot of cylinder pressure.  I think more lift and overlap would help exploit the performance potential you have, and possibly more duration.

With that cam, I would recommend creeping up on your total timing for each fuel type slowly.

I'll probably take some heat for this...

But how does everyone feel about lead pollution from running water through your pipes when burning avgas?

In the big picture I'm sure it's not much different from just running normal petrol anyways but I'm just curious what everyone's thoughts are.


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Think I'm gonna have to leave it alone for a year or two. Pistons are forged, but not designed for a big shot. My machinist says 125-150 only, and what good is that? It'd reduce the amount I lost by, but it would still be a loss.

yes understandable. That thing will be a monster with some spray one day. Definitely pulls hard on the top end. 👍🏻👍🏻


Gimme that BECKY!

I go during business hours and if I need to drive to the pump I ask them to open the gate. Normally I'll only fill a couple of cans at a time and carry them, but the guy that works in the pilot's lounge almost always tells me I should drive out.

X2 they'll open the gate so you can drive your boat in. Just go inside and talk to the guy

I will have a setup similar to 77_liberty. A shade over 11 to 1. I will be running 91 octane with spiking my tanks with 110.  Will just have to find the right setup for my combo. Yay!

Say I was to do the same. When you say spike is that 1/4 or.... What's it take I always have 110 in the garage I just don't wanna waste it.... Say half and half  I'd be better off just doing AVgas

Say I was to do the same. When you say spike is that 1/4 or.... What's it take I always have 110 in the garage I just don't wanna waste it.... Say half and half  I'd be better off just doing AVgas

Lets just say we are able to run 91 straight up without issue BUT if we spike it a little just to be safe and perhaps keep the timing a lil more then that sounds good to me. But to answer you question I am thinking just 10-20% with 110.

I'll see if I can figure YouTube out