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Senior Tech, In Memoriam
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Anyone know for sure when GM switched from the top post battery to the side post during the '69 model year? My Z/28 is a first week of May car, and I wasn't sure which battery is correct. The AIM shows both, but didn't really indicate when the change was made. Thanks.
 

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I don't think there was an actual change over. I think they just put in whatever Delco supplied them with. My 69 Z came with a Y55. Thats only about 450 cca, not exactly heavy duty. GM was still putting top post batteries in on the assembly line as late as 1973 on Venturas.
 
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