[Mike Stenhouse]

Tony,

I assume your Stelling & Helling had a K & N filter.

The standard foam units are really restrictive. We had an owner with a 427 FE report a 100 hp loss with the S&H foam on back to back dyno runs. He sent me the dyno runs, so I know it is true.

The old 427's with dual quads picked up a lot more horsepower from the second air cleaner than they did from the second carburetor.

Mike Stenhouse