I have run cliffords for years. They will eventually leak. They tend to warp, particularly the ends. Usually happens after a good bit of heat cycling. It is easy to fix, you just weld some material to make up for the warp and either belt sand (machine shop can put on belt surfacer or you can actually come pretty close by hand using a file or disc sander). the langdon's are terrific. No warping,great durability and they will hold their value. the cliffords can get beat up pretty quickly, and as every one knows, no value in an old set of rusty headers. Old style cliffords did not fit all intake manifolds. I am not sure whether that was on purpose of not but if you are using any other manifold you will more than likely have to do a little bit of modifying. This is true for the late model and early model chevy headers. I dont know if that is still true with teh more generic versions that are now sold.
