Originally Posted by dr_riedel
I am trying to swap out my 318 y-block for a 440. my problem is that although it is the 440 model it came with the 318 i just pulled and i am wondering if i need to replace the k member or if it will hold up. so if you have any info please i need help to proceed
I have a 68 Coronet 440. The "440" is just the sub model (like 500 or R/T are sub models as well), it doesn't mean it came with a 440. Most of the 440 models came with a 318 and some of them even had a slant 6. Mine also has a 318, I have been considering doing a 440 swap with mine, either that or a new hemi. I asked about doing a big block swap on here a long while back, if I remember right the majority of them said the small block k member will hold up just fine because the 440 isn't a whole lot heavier than a small block. But you probably do need to upgrade the torsion bars to support the big block. It's been a while since I posted that, so I may be a little off. What I have been concerned about is if the oil pan and everything will clear the small block k member and if the if the mounts on a big block are any different than a small block.