Hi there...I have a 68 RS and am just wondering , will a 74 Heater box fit ( both inside and out ) and if so , any modifications to expect ??

Hi Phil, gettin tired waitin for the "experts" to add their .02c ?..... I know I am;):D Is yours a small block? I don't have any first hand experience with the later models but I did see in a Classic Industries catalog, the outer box is the same for '67-'81 small blocks. They don't show the second generation inner box so I assume they're different from the first generation. HTH

Guys, there are no 'experts' in very many fields of these old cars. Some questions take days before someone replies that maybe tried that old of a conversion. It would help if you posted it in the right section, Heating and Cooling, as that is where folks hang out more often that have worked on their systems. They want to share info. but might not notice your question in the "Tech" section. I will move it and hope you get a reply soon.