Ok you guys all know the old saying... cubic inches eats cam duration... so with that being said.... About how much rpm will cubic inches consume with the same cam < Example > 360 cid vs 408... same 12 to 1 compression solid roller with 265@.050... lets assume the heads are up to the task on both engines.... The main reason for the question is that most cam grinders give rpm ranges for stock cid engines... so when you throw more stroke into the equation the rpm is somewhat of a guess