I was just wondering....Having done the Seafoam and other treatments on my Disco 1 and experienced improvement in running and performance. Is the Land Rover V8 (Buick) more "prone" to carboning up than other small to medium size V8 engines? Would I experience improvements to performance with other older, even carburetted v8 engines by doing Seafoam induction cleaning? I have an old 1977 GMC truck that I have to use once in a while. It sits idle a lot (most) of the time. I am now wondering about doing a similar "style" of tune up and induction cleaning on it, now that I have done this on my Disco. Its got a big 350 V8 with 4 barrel carb. Improvements in gas economy would be appreciated on that also. On a carburettor equipped truck, would I just slowly pour it down the throat of the carb, or should I hook it up to a vacuum fitting on the manifold like one does on the disco with fuel injection?

 

Because of the old engine design yes LR's are subject to more carbon build up than other cars. The DI fuel injection is only once removed from a carb, in fact putting a carb on a DI isint very hard to do.
On carb cars to remove carbon we would warm up the engine and then use a spray bottle and squirt water into the carb, the explosive evaporation of the water would break the carbon loose and the car would run smooth as silk.
So to answer your query, yes, doing Seafoam to your GMC would help it. I would just slowly pour it down the carb once the engine is warm.

 

It is a big issue with older Rover's and can be a problem with other blocks.
If you do this once a year on any motor your performance and MPG will be better.