1995 ETC, 75 Deville, Cad500 powered 73 Apollo, 94 Mark VIII
I've heard that putting a carb spacer on the stock intake manifold will net around 15 hp on a 500. Since my 425 uses the same type low rise intake manifold, it should give me an extra few hp also, if it's true. So anyone know if it's true or not? And what size spacer should I use if I try this?