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And which pieces will live at that hp level? I'm contemplating the switch from BB to gen 3 and checking CL for core engines. Stock block ok? Which core engines to avoid, if any?




5.7 and 6.1 blocks have thin cylinder walls. Have seen them crack at as "little" as 750hp. Most guys want to throw a block away if they have to bore it any more than .020". The LX guys really spend A LOT of time and money tuning them to perfection to get them to hold up under higher hp. A 6.4 block is the most durable of the three. Getting your hands on one is tough right now though.


knyech1- '71 Sassy Grass Demon 340/904. Pump gas, 1.61 60ft, 7.439 1/8 @ 95mph, 11.824 1/4 @ 111mph "Not too bad for a pump gas 340, full of used parts and hillbilly ported stock heads." - V.B. '03 2500 5.9L HO 6-spd on 35's. 395hp/755ft-lb at tires.