There have been several friendly arguments on SBC/LT1/BBC vrs LS on this forum over the years. I was digging through some older issues of HotRod while on the throne the other day and came across the crate motor shootout. I started comparing old vrs new on GMs crate engines. It is a real eye opener for sure! Lets compare what I think would be equal old school vrs new stuff. Battle 1. LS327 ( truck 5.3 w carb) vrs the standard of crates ZZ4 350. LS327 12.35 at 105, ZZ4 12.44 at 105. 323cid vrs 350cid. smaller LS wins. Battle 2. LS3 ( factory stock vette/Camaro ) vrs ZZ383 stroker. LS3 11.33 at 114, ZZ383 11.70 at 111. Smaller 376cid LS wins over larger 383 SBC. Battle 3. LS7 ( factory ZO6 vette) vrs ZZ427 BBC. LS7 10.78 at 120 , ZZ427 11.35 at 115. Same cubes, but a pure thrashing by the LS. Battle 4. LSX454 (Not a factory style crate, this motor was tired after 100s of dyno pulls and a long haul power tour) vrs zz572/720R ( not intended for street use, 12 to 1 CR) LSX 454 10.75 at 120, ZZ572 10.21 at 128. No contest, proving that no matter how you look at it there is no replacement for displacement in an NA app. If you dig a little deeper ,you will see that the little LS3 even takes the ZZ427 BBC, although by a very small margin. The test car was a 69 Chevelle and all combos were setup with optimal 1/4 mile gearing and stall converters for the engines power curve. None of this thread is intended to create a fight, just to show how technology has given us gear heads some pretty impressive power plants to take our hotrods to the next level and keeping OE level drivability ( if you can stand to leave well enough alone, LOL ). Enjoy!!