[jjzepplin]

This is an LS based engine and does not have an optispark. I think the "LT" style does. It is a 5.7 so Not a 5.3. I think parts interchange but not perfectly sure. I found a bracket off of a 4.3 V6 but not sure if it will fit. I may buy it for the pulley alone as it should be steel versus the composite unit on my bird. If the whole bracket fits I will switch it over to have the alternator on the top. I took the alt off once already and what a mother to get to and that rear bolt was a fandango!