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Is it a GM chassis, if so this says the vin J is a 454 cu in http://chevroletforum.com/forum/general-tech-10/emission-parameters-31265/ In the UK I own a 1998 Damon Challenger RV with a 454 engine Vin=J,
At GM vin cards though it says it's a 6.2 diesel http://service.gm.com/dealerworld/vincards/pdf/vincard90.pdf Is it gas or diesel?
It is gas