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Here you go https://forums.iboats.com/threads/how-mercruiser-thunderbolt-ignition-systems-work.676476/

You're right, for some reason in my head I was picturing the choke plate/shaft.

I'm actually not sure that this would even be unmetered air. Air is coming in before the venturis so it should draw additional fuel, mixture would still be correct. If anything if would act like the throttle is more open

Can you still use your diacom/adapter with the new motor?

1. I used the newer pan. I forget, but there was a reason why the old pan couldn't be used with the new motor. I wouldn't imagine that you'd have the same issue since you aren't changing vintages. I needed to cut down the dipstick and dip tube to make it work (the truck pan is baffled) 2. I did...

Man do I miss that. All the German Bosch FI of that era...My 97 ranger has OBD2 but also can paper clip it for the few ford specific codes.

Yeah, $180 from the yard for mine (I had to pull it though). '01 blazer, at least 200k miles. Should have gotten it freshened up but didn't want to lose the whole summer. I swapped from an '89 non vortec non balance shaft which made it a bit trickier. The head gasket on the '01 was composite and...

I've got the same one but was a bit cheaper when I bought it. Works fine

So, aside from the mid range discrepancies (which agreed shouldn't be there), is the attitude of the boat on the trailer the same as when it's sitting on the water? My sender is also towards the stern, and it's location makes it so that the tank level doesn't start dropping there until it's used...

the what?

Well...I tried to double check. Manual #8 (looks like where your info came from) only shows that 20 ft lb. Manual #25 (newer models, but doesn't state s/n applicable for some reason) lists it as 22 ft lb. I'm not sure when the roller arm rockers came out (mine had them from an '01 blazer), so...

What do you do with all the gas

I think I mentioned some where around here that I waited tables at EYC, lived on chappy. Used to "borrow" tenders from the harbor to get home after the bars/ferry closed if the harbormaster wouldn't give us a ride. For some reason nobody gave us a hard time about it, and we returned them the...

Actually he said it didn't leak in the water. Then said it didn't leak in muffs... Definitely needs to figure that out first

Wow, surprised that the prop made that big of a difference. Glad you figured it out, thanks for the update

The problem with the etecs is that there are no parts available. The optimax have super expensive parts combined with poor reliability. A dunked motor isn't worth it, esp salt. I've been chasing electrical gremlins in mine for a few years now. Literally every part that went under (electric wise...

Yeah, I was in New Orleans. Flood waters came about 3 blocks from my house.

Hmmm. Too bad, they're awesome. Thought someone here was on one of the islands.

Word on the street is that the etecs are steer clear, as well as the merc optimax, but I'm not knowledgeable about either

Aren't you on Nantucket or the vineyard?