[DavidBetts]

I purchased that manifold from Tony Branda two years ago. First 427 had two Holley 450's on it and it run just fine. Recently received a complete engine from Southern Automotive (Bill Parham) and they reused the Blue Thunder, now with two Holley 600's , as we felt we needed a vacumm on the secondaries. The 450 cfm carbs. are race carbs (a little hesitation if you snapped on them hard). I polished the manifold with a wire wheel, buffed up real nice. Either set up the manifold went on perfectly, no gaps - no leaks. I'd buy another.