450 or 600?

Steve, sounds like you got it covered. It's just bolt ons and easy to convert if you ever want to, and the padded engine box is easy to convert as well. It's not like you are going to ruin your boat. The only down side if you convert to side drafts is getting used to the loss of power from going to 2 1 barrels from a 4 barrel.

8122pbrainard wrote: Riley wrote: The only down side if you convert to side drafts is getting used to the loss of power from going to 2 1 barrels from a 4 barrel. Bruce, I don't feel this is true since those YH's can handle plenty of CFM's. CFM specs are hard to come by but Craig (64X55) who has a X55, did do some reasearch on them. From a good source, he found out each will do about 225 to 250 CFM. The only advantage in my mind with a 4bbl, is you have the luxury of having the secondaries kick in when needed. Take a look at the bore size of a YH sometime - they are big!!

Here is a quote taken from Black Hawk Engineering . They make custom metering rods, etc for the YH.

......."""The throttle body has a 1.83" bore to fit the F flow (180 HP) turbocharger inlet bore. The Performance Trends "Engine Analyzer" simulation software predicts that the throttle body will flow 256 CFM versus 128 CFM for the original "180 HP" YH carburetor. With the boost limited to 12 PSI for longevity, Engine Analyzer predicts 193 HP net versus the 148 net HP of the stock "180 HP" system. The EFI system is able to produce better fuel economy despite generating more power. I will also manufacture smaller throttle bodies for the B-flow (150 HP) turbochargers."""...

They are talking about a replacement throttle body on a turbocharged engine. The "software" predicts 256cfm vs 128cfm of the original YH carb..

...Anyone got a hole saw big enought to cut a hole for the flame arrestor?

Steve,
It can be done!! There really isn't anything hard about rebuilding YH's!! The trick will be getting them back on the engine and seeing if any tweaking is needed. By now, you should be a "master tweaker" of the YH's!!

Yes, there were a few extra parts left over in the kit but that's what makes a good mechanic - making it work with missing parts!! Actually, after talking with Daytona, the YH kits are universal covering all 4 generations of the carb so, some of the parts in the kits aren't used on all of the models. They sure did throw in the extra gaskets though!!

I'm just trying to keep you from cutting a hole in the top of that dog house!!! There is nothing wrong with the YH carbs!!!

Pete,
I was thinking more of a pc of furnace plenum, lay it down on top of the doghouse and cut the front out for forced air induction ...

Pete we should be able to pull this off, but it seemed "SO SIMPLE" at the start.Steve and I may start swapping boxes via UPS.One mans trash is anothers treasure ????? I vote for a Pro Stock auto scoop

62 wood wrote: boat dr wrote: Steve and I may start swapping boxes via UPS.One mans trash is anothers treasure ????? Actually I think its more like .. "One mans treasure is another mans even more desirable treasure!"

Steve,
We are both very lucky that we have Billy around!!

So, it sounds like I can't talk you out of going non original!!

Carbs look good painted up Pete.

Steve, Ram Air like the GTOs had, I like it! That ought to really boost the hp.

Steve , so far I gotta a good 4160, fuel pump, thermostat cover...Boxed up...........   Whattcha got that I need ??

Steve, I see you haven't installed your intake. Both the side draft and down draft I've seen have an exhaust crossover. I am re installing ours with the truck gaskets which have a plate with a small hole in it rather than the open port. Its supposed to keep it from getting as hot as the open port.

I spy a donut? Tsk tsk.   

8122pbrainard wrote: Two rebuilt YH's on the 312. Steve, there really isn't anything different about rebuilding a YH compared to other carbs. I did have to open them up and adjust the float level.

So Pete, how do they work? Where did you end up with the floats?

btw, I just got my 4bbl intake sandblasted...