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**1971Stepside** · 11-13-2018, 06:46 PM

Welcome to the board. No modification to the firewall on my 71. Not sure what year or LS you are working with. One thing I can tell you is to do plenty of homework. Know your AC plan, your header plan, your engine mounting plan, etc. Each piece will impact the next one. I used POL engine stands with LSX innovation adjustable plates. Kept the engine in near the same spot as the original small block. Good luck.

11-13-2018, 06:46 PM	#2
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,932	Re: LS swap question Welcome to the board. No modification to the firewall on my 71. Not sure what year or LS you are working with. One thing I can tell you is to do plenty of homework. Know your AC plan, your header plan, your engine mounting plan, etc. Each piece will impact the next one. I used POL engine stands with LSX innovation adjustable plates. Kept the engine in near the same spot as the original small block. Good luck. __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."