ive got a 4 barrel 429 with d3ve a2a heads. i would say that this motor is all original. if i were to convert it to a 460 by fitting a 460 crank and standard style 460 pistons what would my new compression ratio be. i have read that dove heads have a 77cc combustion chamber where as d3ve heads have a 97cc combustion chamber. is there an automatic increase in the compression ratio by going from a 429 to a 460 while still using the original d3ve heads. if so can you tell me what i might expect my original 429 compression ratio might be and what it will be if i do the conversion to a 460. how is the 460 motor compared to the 429 in regards to its feel, performance, drivability, fuel economy, revs, or any other factors you can give me. this motor is in a ford galaxie 1970 ltd. it was australian delivered rhd with a 390. someone else did the conversion to the 429 and i suspect the motor was out of a thunderbird, just an educated guess. is converting to the 460 worth it or just a waste of time and money. thanks, paul.