May 22, 09 · The 305 has a VERY small bore (like the original 5556 265s), whereas the 307 has the same bore as a 2 (3875) If you bore a over and drop in a 350 crank, you get about 338 cubic inchesSep 21, 18 · To start with, I am replacing the stock 305 TBI motor with a brand new GM crate 350 TBI motor To that end, research I completed said that I would need to swap out the injectors for 350 injectors, use an appropriate chip for a 350 on the ECM, and use a 350 knock sensorJan 04, 08 · The 305 has the same stroke as a 350 Aside from that I've read that 307's usually have more or faster bore wear due to the alloy in the block All things being equal the 305 probably makes power a bit lower due to it's longer stroke I know that people do put 400 cranks in them, with the mains cut down
How To Get 350 Horsepower Out Of A 305 Chevy Small Block