Mike How is the project going? We are all anxiously awaiting how the intake is coming along

Good job 👍 I changed for a TBI system on my coach .

Beautiful shop.

Just curious, but have you considered using a Holley Sniper EFI? They have a Quadrajet version that replaces the old carburetor one-to-one using the exisiting intake manifold, and you "only" need a new high pressure fuel pump.

Looks Great Mike. Your work on this is a nice contribution to the GMC community. Thanks.

In aluminum casting, I would be up around 1300 rpm. The formula is (cutting speed X 4)divided by diameter of the cutter. With a coated cutter, your cutting speed is about 250sfpm.

Fuel injection is definitely the way to go!

I might be able to help design and 3d print a custom snorkel for you if you'd like. Get me some dimensions, and I'm happy to give it a shot.

That's a nice Johnson you have there.

I've been using a jeep snorkel on a GM Rochester throttle body since 2009. It was found by others that the barrel nearest the snorkel intake was getting starved for air. Using a spacer to raise the snorkel allowed the air to make the sharp 90 degree turn and solved the issue. Unfortunately I can't post a link to a photo on YT

Should work. All the best!

Have you thought about modifying the engine cover instead? And then add a removable center storage/cupholder/console etc . on top of the hump. It seems like a wasted space there anyway for many things. Console could be attached to the cover with cleet and slam latch of some kind.

Looking forward to seeing this project to completion. I like many have opted FI system that replaces the carb. We also replaced the intake with the aluminum intake that Applied sells. It does look nice and works well.

Mike - You cannot own a GMC and be a cheap arse. GMC - get more cash for your GMC motorhome .

Mike, good to see a new video. As we had talked at the June rally, my coach has the gm throttle body injection from a 90s 454. With my setup, I have the stock intake with the heat tube blocked off. Gm throttle body and stock air cleaner. All fits with no floor modification. Then I have a flex dryer hose off the snout of air cleaner to the Ragusa cold air scoop which is mounted in the slot of the grill to get outside air rather than hot air from engine bay. The only thing my system lacks is an intake air temp sensor which i plan to add for better fuel trim. For you, as the other mentioned I think the slope is due to cars having engine tilt for standard tail shaft transmission it compensates so carb is flat or level for floats. I think you could plane that off just above the runners, retaps the screw holes and seal them off. I don’t know how much that would affect performance if any due to shortening the length of intake. Probably negligible. If you’re dead set on the current do you have then I’d go that route. Unfortunately, I heard Bob R from dynamic efi passed away this summer. He was the guy who made the flashable board that replaced the factory chip in the gm ecm. I haven’t heard of anyone else worked there or is taking over. But if you weren’t set on using your current efi then I would suggest the gm one. With it I have knock sensor, electronic timing, etc. I think you mentioned yours doesn’t do timing? Also with the gm ecm, I found a newer electric cruise servo and with the speed sensor I’ll be able to have tap up/down cruise as well. But I have to replace coolant hoses before I do too much. Hope to see you at a rally this summer

I'm planning fuel injection on mine too. I like the idea of a pony tank with the high pressure pump in it like most cars are built today. Being in the fuel keeps the pump cooler and knock down the noise. One thing I've seen is that you want to recirculate your fuel back to the tank. Have a port near the top of the pony tank that goes back to the tank and have the incoming port use a dip tube to put the new fuel to the bottom of the pony tank.

I'm a machinist by trade for the last 40+ years. To me, it looks like you can take the whole thing down to the top the of runner castings. Just watch for interference with the new throttle body. Especially with the throttle lever. As far as the studs go, if those holes are at an angle, you can plunge mill them square to the new surface and put in a Heli-coil.

Hey Mike! Hope you had great Holidays and thanks for the video, I am still running carb but we do not take our coach into higher elevations and if it aint broke dont mess with it in my case. I need to update my build over on the forum and I am still doing the interior. Learning to build cabinets with hillbilly engineering!

Most cars have the engine tipped back which is why the carb is on an angle. In the end, the carb is level. Edit to add: Most rear wheel drive cars have the engine/trans at an angle in the car.

Thanks.. i was checking your lift points. I need to move the behemoth around before pairing it back to my caddy 500.

Hi Mike, just came across this video. I have a 76 Palm Beach that needs the rear hatch glass replaced. I had a glass company come out and they had a hell of a time trying to install the glass. They finally threw up their hands and walked away. Could you please explain how you were able to install the glass in 15 minutes. Looks like I'm going to have to install the glass myself.

Enjoy your weekend

Nice work, Mike. Nice really weather in NS, too.

You might consider putting a wheel lock on that spare. Very easy to have stolen. Love the kitchen vanity, especially the Trashmaster 5000!® I need that in mine!

Is that a hide-a-key? Smart idea

Hey Mike can you show the headliner again,redid mine with original type material,foam inside is deteriorating .

did you find out why the drive sprocket was rubbing? if not you need to pull it back out and fix or replace the drive sprocket

I had Rick's carb shop in daytona FL rebuild mine. Man, he is amazing!! Bolt on and go ! 454 in my rig.

Nice project! The Q-jet is a good carb for this application imo. The best part about keeping it carbureted is that you stand more of a chance of fixing it on the side of the road vs the fast system. You may check with Mike's Carburetors for a quality rebuild. You may watch Thunderhead289 Uncle Tony's Garage and Unity Motorsports Garage and search their carb tuning and ignition videos. These guys have some great info. One thing that helps carb setups the most is having a fuel system that keeps a constant fuel pressure on the needle and seat. Thunderhead289 has some good videos on this. If you don't want to mess with the fuel delivery system to much putting a fuel filter near the carb that has the 3rd port that let's pressure and vapor bleed back to the tank this helps with some carb issues if not wanting to go with a regulated return system. It's hard to beat a carb and hei when ser up right. If your trying to tune by the book good luck those settings are not for the modern fuels of today. You need to spend time and tune to what the engine wants not what you think it needs start with ignition then work toward carburation. Thunderhead289 has a cool product that's called Carb-Cheater that would work well on something like this.

I used the Fi-tech force fuel system on our GMC. I put the return line in the filler neck just past the bend in the vertical section on the tube and it works out well.

Please beware : after market products or not what they used to be , even - fuel injection... !!!!!

the engine was intended to be removed through the bottom. much simpler

I'm looking at doing something similar for fuel injection. I was thinking that I would use the mechanical fuel pump to fill the pony tank. With a gallon or more of fuel in there, if you uncover the fuel pickup on a hill or get vapor lock, you have a built in reserve to keep going. Having it pump more fuel through the pony tank than is needed will keep the fuel from getting hot in the pony tank.

Worked on probably a 100 qjets on motor homes, make sure the float is absolutely correct(use your finger to hold the D-ring in place, don’t use your finger on the needle and seat). The base gasket on the manifold needs to protect the carb from heat, q-jets will boil! Used to used a pretty thick gasket cause all that engine heat is up by the carb, the doghouse makes it worse. Don’t over torque the carb to manifold this ruins the top carb cover and warps it. The choke has a small lever and rod that can be a little tricky to get back together, I’d put the carb on its side and use a small pick tool to get it in the right position, then put the choke housing in place. Sorry it was so long, just want you to be successful. Q-jets are FI if you know what you’re doing!

That's a 455 oldsmobile engine

Hey Mike , after fixing Quadra jet , then it needed a professional re build . so after 50 for first gaskets and second professional rebuild a year later same thing drip. so i found a brand new Quadra jet from china or some where 200 bucks , best thing i ever did , had tried the edlebrock answer and was not happy .

Best carburetor anyone ever made

Now you know why they have the nickname " Quadropuke".

Tighten it until it JUST strips. Then back it off a quarter turn😂

Slow down. Leaky inlet is a junk yard body and transfer to that. Iggy on a motorhome is really in no need of vac. advance. That vacuum advance really just retards timing under any load! Set idle timing and know timing at maximum engine rpm which is ???4000?? get rid of steel braided lines rubbing on other hoses

☔

Mike, I recently started the series from the beginning - and I can help with Solar. Let me know what you're thinking - and can help answer questions, direction, whatever.

Great Lakers are awesome peeps!

Mike, we’ve been following you for a while and are so thrilled to see that you were able to take your GMC to a GMC Great Lakers rally and hook up with several GMC’ers while you were there. Thank you for mentioning the fact that our community of owners is a very supportive and welcoming one. It’s this fact that helps keep these vintage motorhomes on the road 45-50 years later. We hope you enjoy many years of membership, mutual support, and friendship with the GMC Great Lakers community. Please consider joining our national organization and, if time allows, register for the 2024 Fall rally in California this October. Some folks choose to leave their GMC’s behind if they consider the travel distance too far or too risky (or too expensive!) and either drive in a modern vehicle, travel by train, or fly to the national rallies instead. For more information about the Fall rally, please visit our channel www.youtube.com/@VintageGMCMotorhomes.

Great to meet you Saturday! Good People, Good Times!!!

Do you still have all this stuff?

Hi Mike, Great to see that you have your coach on the road and you had a fantastic experience at your rally. We only have about a half a dozen couches in this neck of the woods, so we’re not very organized. I just got back from a four day trip with my girlfriend and our three dogs. We only did 250 miles but we’re in two locations. Traveling the back roads at 40 mph, for the most part.My mileage per gallon is probably pretty good but I don’t let myself worry about that. Although I did have one mishap where I got my rear bumper hooked on a tree and peel part of it away. The tree and the bumper. I use the tree to push it back in place and will have to replace it in the near future. We had two days at beachside and one in a pine forest, so overall, it was a great short vacation. All the best. Keep up the great work.

Was great to finally meet you.

7.5 mpg is in the ballpark for sure. Without EFI, you're unlikely to see significantly better.

I couldn't believe my ears when you said you were going to Centreville. I grew up there until I went to MSU and now live in Adrian, MI. I wanted to come see you in Centreville as I have a 77 Royale I got in April of last year and almost everything works except the Onan as the Onan experts can't even figure out why. That is why I escaped the 90 degree weather and came closer to your home as I am across the bridge in St. Ignace until the 24th rather than take the coach to Centreville. Hope to see you sometime and ask you the obvious questions as is there anything you can't repair and is there any tool you don't have. Safe travels back to Up North (Traverse City? Kingsley?).