I PURCHASE A CAM , SUPPOSE TO BE A 'B' CAM? HOW DO I DISTINGUISE AN A FROM B CAM. I WAS TOLD A B WORKS BETTER/. SOME TIME BACK, I SAW AN ARTICLE ON B CAMS THAT HAD TO DO WITH LINES???? CAN SOMEONE DIRECT ME TO THAT OR HOW TO TELL IF i HAVE A B CAM? THANKS AS ALWAYS/ PS WENT TO NEW ENGLAND SHOW AT STURBRIDGE.. FANTASTIC.... OVER 250 CARS OF ALL TYPES/ JOSH