I have rebuilt my 360 engine in our 1980 Brave. I purchased new heads, mainly because the left one was actually split in half, but we are using the original intake. Any advice on a new carb? Not sure what to do at this point. The original had the secondaries frozen up and we couldn't get it apart for a rebuild. I took it to a carb guy, but he said there was no hope for it.
That's sort of what I got out of this adventure. The start of this was a camping trip that my rv barely pulled itself over an arched bridge. The only weight was itself and our 5x8 trailer with the golfcart on it. Anymore, I think no one really knows how to work on the older stuff, so they do swap it out. In my case, the guy that "thought" he could fix it, actually ruined it and still attempted to charge me $50.00 for his time. I know nothing about engines, so I watched a million Youtube videos and ended up tearing the engine all the way down. The right head had 5 burnt valves and a crack between 2&3. The left one had 8 burnt valves and was actually cracked in half. I ordered new ones and just hung the new ones yesterday but haven't torqued them down yet. We decided since we spent all the money to do this much, we would also purchase a new carb.
Be sure to crank the engine or electric fuel pump and flush out the fuel system into a container before installing a fresh carb.
Nothing wrong with an original Thermoquad. It certainly will be the easiest to install. The OEM four-barrels with small primaries and large secondaries are pretty much limited to Carter Thermoquads or Rochester Quadrajets. Aftermarket you've got Holley Spreadbores. The Thermoquad was a well engineered carb and gave good efficiency in the primary "two barrel" mode. When the huge secondaries opened - it's like flushing a toliet powered by gasoline. But hey - any 600-800 CFM 4 barrel is going to do that. Only other choice it to intall a two-barrel with an adapter. Many two barrels are less efficient that the two-barrel section of four-barrel OEM carbs. So, not much to be gained with a two-barrel except simplicity. In regard to aftermarket carbs. I've had many Holley double-pumpers and Spreadbores in the past and it seems I was always tinkering with them. If it was mine, I'd stick with something OEM and engineered specifically for your engine.
I would just go to "Summitracing.com" and order a "new" Thermoquad for about $300. The old Thermoquads were excellent carbs... especially for motor home applications.
Summit Racing part # SUM-210234 is $279.97
Rock Auto has rebuilt Thermoquads for 360s for $252. Why couldn't your carb-guy take your's apart? Can't say I ever heard such a story beflore unless your carb sat outside in the rain and snow.
Honestly, I think he either didn't know what he was doing or he was trying to rip me off. I live in Myrtle Beach, so I think most of the places around here are used to charging for new parts and because people are stuck here on vacation and have no choice. I have learned that anything done to our rv has to be done me in order not to be ripped off anymore. Thanks for the Part number.