If I am not mistaken, the original battery is a group 27, and there are two different Optima's to choose from, one being a group 27 and the other a smaller one.
1967 Firebird 400/4spd all numbers matching 1971 Camaro Pro ET Drag Car 1970 Camaro real Z-28 (needs everything) 1963 Impala 409 dual quad 4 spd 2003 Victory Vegas 2009 Pontiac G8 GT (My wife says I have a problem.....)
