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Message: <blockquote data-quote="Marky Dissod" data-source="post: 28715" data-attributes="member: 13218">From '94-'96, this is true, but before that ...From '91-'93, the 4.3L LB4 V6 was available for 9C6s and fleet orders.Drove several LB4 & L99 Caprices as a cabbie, but since I can't prove either of those, here you go:[URL unfurl="true"]https://www.impalassforum.com/threads/4-3l-v6-lb4-in-the-92-93-9c6-taxi.738321/post-11884769[/URL]AND[URL unfurl="true"]https://www.gmpartsgiant.com/vin-decoder.html?vin=1G1BL53Z8PW155788[/URL]Failed to make clear in this post that the GM Parts Giant VIN being decoded is1G1BL53Z8PW155788which is a '93 Caprice 9C6 taxicab with a 4.3L LB4 V6 and a weak@$$ 3.08 (should've been 3.42).The L99 4.3L V8 was worth ONE city MpG & ONE highway MpG -  ONE! - over the 5.7L LT1. In other words, L99 4.3L V8s were for CAFE MpG reasons.(Same goes for 2.56, 2.73, 2.93, & 3.08 axles GM wore out many 4L60Es with - 3.23 for real world economy, 3.42 for light fun, 3.73 for serious fun.)L99 beat the LU2 & L35 in terms of MpG NVH and emissions, and simplified the assembly line, but any respect/praise the L99 deserves won't come from me.In the real world, the 4.3L L99 V8 is inferior in every measurable and unmeasurable way to any 5.7 LT1 in decent running condition. (I tune L99s & LT1s by the way.)If you buy an L99 Caprice, I promise you, even if the L99 needs no repairs or maintenance, but especially if you want any hint of performance at all, PLEASE,install a 5.7L LT1, tune the pcm for it (I can, if you like?), buy an 8.5" 10-bolt if it needs it, 3.42 for highway, 3.73 for city stop'n'go & more fun stuff,then suspension and steering to your taste.</blockquote>