Haven't had a problem since 1997 when we started running them.

So where are the o2 sensors?

In the headers, kept them a little closer to the block,

You can see the the O2 on the port engine top outside pipe in the front. The starboard engine black plug inside tail pipe in the front.

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This looks really cool!! Do you you only run one 02 sensor in each motor? Looks like the other tail does not have a sensor in it. Also for us roots style blower guys, could you get away with only one throttle body on top of a 10-71? Right now I run twin 850 Holley's on top of my 10-71's but if each throttle body will support 1200hp that would be plenty. I too would love to go EFI!!

you only need one to get tune in, just some exhaust keeps getting the wet and kills them quick, lightnings for sure, plenty of talk about that on here...

I just called Fast and they said this quick learn system does not work with any power adders, but there XFI system will. However the XFI system will still require tuning and programming, not a self tuning system...

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i have been looking into this for months and i am dead set on doing this EFI setup. i have a older holley MPI kit that i have everything to make it run but i don't want to deal with programming the old school commander 950 computer. i have not found allot of feedback on them but i have found actual marine engine companies selling their brand new warnateed engines with them so they have to be working well. the bad comments i have seen are from people that have tried putting them on engines that are beyond a basic self tune setup. i am planning a 496 stroker with aluminum edelbrock heads, hoping for 550-600hp. i am running gil HP500 style tall manifolds and risers so i don't believe that i will have too much of a issue with keeping the O2s dry. good post!

I contacted Fast awhile back about their self learning systems and the thing that killed my application is that they need to see 9" of vacuum in gear to tune properly. My cam is too big I barely pull 9 in neutral. FWIW