who cares what they were from the factory. and i'm not talking race blocks or even TA blocks here. i'm talking standard production blocks. the 360 wasn't liked by the old school because as you say was a truck motor,low compression and no performance pistons for them just like the 400 that everyone wants now. that was then. this is now. and there are plenty of pistons out there for a 360. a 360 is more readily avalible and at more reasonable prces then a 340. leave the 340 for the numbers guys and build a 360 to run.