I'd be interested, but so far away. Moo is soooo bored these days. One kid in High School, the other is a "tween" Cripes! good thing I haven't given up drinkin!

Ray

Here's my take on it, Glenn and Tony both touched on how these things work breifly. Tunnel rams increase air/fuel mixture velocity, mostly reserved for full throttle applications, and, important! cool the intake charge tremendously due to that velocity.  Basically meaning the air and fuel will both be denser, (More fat). Lean conditions with 2 450's surprises me, a bit, but you said you put 5k into the motor. I'm going to assume this wasn't just a rebuild and it's been hot rodded quite a bit (If not, you were ripped on that rebuild), but even at that, I would put a vacuum guage on the thing and try a few spring kits on what you have first. (HDRider, Tom at JBP, Boost, or EngineDoctor would be the best source on info, data on doing that). I think it can be tuned just fine with what you have, IMO.

More specifics would help as to cam, C/R, etc.

What I call a High Duration cam is anything in the 292 and up range. Those are going to be an immediate vacuum problem in many cases (I'm running one a LITTLE bigger than that). On a Boat, not really a huge, insurmountable problem. No Power brakes, Pollution contral crap, heater cores or anything else to rob vacuum. Hence the vacuum leaks comment.

The sheer volume of the tunnel hurts throttle reponse, in many cases, it's intended purpose is WFO. But the vacuum can be made up from gravity and velocity. The push is if your primary's are too big, you'll never develop enough vaccum for the secondaries to open, or open fully. spring kits can help this to a great degree.

Here's when you KNOW it's running  GOOD! Will idle fine, cruise all day long, no lag when flat footed, and after a hard full throttle run for a mile or better and it has frost on it like your freezer develops, and the plugs read good and grey! That is utopia on a tunnel ram. (Kids freaked out and couldn't beleive, at the AVI, when after a mostly full throttle, up-river 5 mile or better blast they coulda made a slurpy from the frost on the top end of the engine at 90+ degrees outside)

Hard to come by. I'm very close, but as I said still running a tad lean and hesitation still a slight issue. Some of the hesitation is my pump, but not all of it. Price you pay for going against the grain and trying vacuum secondaries on one of these things. BUT, they can, and do work, just not so easy. Keep this in mind though, mechanical secondaries have a totally different set of issues to deal with, and I'm not sure they are easier, IMO.

Long and short of it is this. Which is too late. Sounds like your dead set on the tunnel, which I totally understand. Though it really seems to me more performance, and less hassle, can be had with a large single carb/single plane setup (850 to even a 1050 Dommy on a Victor Jr, Torquer, or any single plane intake).

I have 5 boats here to try anything I want, and beleive me I will. The Moo's gonna stay Tunnel Rammed just because I can. Whether it's gonna perform better than the rest? Next summer will tell. As it is, she runs out just fine. Ask Nordie, lol.

Ray

Need to correct that last part as it reads very snobby to me. Didn't mean to sound that way. Just tripped across smoking deals on parts, boats, etc, all making this possible. I'm not rich, nor have an attitude like that, but as I read that, it came across that way. Trust me, I'm as frugal and scraping as the rest of us are. I just happen to have tripped across a situation that warrants this experimentation.

ray thanks for the info. those 750's vaccum or mechanical double pumpers.

Vac Secondary dual feed single pump.

Ray

Ticking away, lol.

Ray

WERE I to winterize, I'd do as Skip says. Fill the tanks, add Sta-Bil, run it so it gets into the carb(s), then use the Marvel Mystery Oil spray deal that GT uses. Not sure if I remember right, but I think he said spray it into the carbs with it running until it dies. I wouldn't bother draining the block, if it freezes that hard there in Bako, we all have bigger problems than a boat engine block.

Ray

And yeah, what's a sweater? Do you have a pic?

Talked to him last night Tdawg. Mines available if you need to use it. Some time and I will just give him another (wanna Swap trailers on the Saguaro). But obviously well outta Anaheim. Titles on both.

Ray

Loved my 21'! My Uncle loved his 18'. Both well made boats. I guess the company had quite a rep back in the day according to my uncle. It's demise is a pretty sad story, as I understand it.

Ray

GREAT POST!

Prolly actually happened more often than not, though. The French have been over-run more often than a Nascar Speedway.

No wonder they hate us. We had to save them every single time!

Ray

Sorry Brandon. Been going through a near death experience here (Inventory at a Home Depot). Meant to get back to you and others. (Tom, I'll get those cables measured and ordered, as well as the PD, just under the gun right now).

No it won't fit or work for what I had in mind. Great scoop though!

Ray

Why do I KEEP looking at this and thinking about it? 

Why couldn't it have shown up a couple months ago? How the hell to get it here AND, where to put the thing!

Ray

I guess the how to get it here part is my only REAL problem, 

THAT is OUTSTANDING! LOL I Can SO see you doing that too!

Ray

Get a red one, Would love to see the names for that!

Check! 

Ray

Amidst the shenanigans that is regular around here, the SCJB Birthday, my kids are CONSTANTLY reminding me there is this holiday as well.

Have a safe one Trick-Or-Treating.

Kids are gonna run the hood and see what they can score, gonna sit out front with the firepit and neighbors giving out candy and shots of Crown to the adults (Or did i get that backwards?).

Really wanted to do the haunted Boatyard scene in the front yard, but ran outta time to get it organized! Next year maybe. (Need GT's Tuna Boat! that would be AWESOME for that!)

Ray