Ive been told that if you put a 460 crank in a 429 you will up the compression a little and of corse gain a few inches. Has anyone ever done this or know that it will really raise compression. Thanks
You must change the pistons. The crank and pistons are the difference. You can keep the rods. It is possible the earlier year 429 will have a .020" shorter deck height than a later 460, and the increased volume of the longer stroke would have a very small impact on compression. But you have to buy pistons.. so pick out what you want. I did this when rebuilding a 70 model 429 just because it was easy. The only increased cost was finding another crankshaft. I would highly recommend balancing it when done.
On the crank without counter weights up front it will not fit certain blocks. the counter weights are thicker if I remember correctly. been awhile but ran into this once. You can grind the block and clearance it but its a lot of work. Or just check the fit with crank in block. Usually the older cranks like the pre 78 if I remember. I just remember it being a pain in the but. Cranks with counter weight up front have thinner counter wieghts and clearance isn't a issue on all blocks. Definetly check before committing to anything. hard lesson might save you some headaches. Older blocks haved shorter deck height also if I'm correct. My 460's been running good for a long time and haven't had to mess with this stuff in many yrs. The old 429 is sitting in shop on stand as spare just incase situation, good engine but wanted more. Catch you later any questions drop a message.