Help, I'm trying to replace a head on my 0540, The motor has 1/4 spacers under the cylinder base flange's, I was told they might be go-480 heads, also the pistons have bee shaved (75413). The number on the cylinder is (73869) also k272, eqp2 and rev-a. not sure what it all means. Jernigan told me the 480 heads were 1/4 shorter than the 0540. My cylinders measure 11 5/16 from top of base to top of the head. Has anyone out there seen this combination. thanks again for any help I can get.. also the motor is an e4b5