340 Vs 360

What even is the argument for picking the 340 over a 360 when starting a new build?

As far as I can tell any potential advantages of a building a 340 over a 360 are unlikely to ever be realized in most street/strip builds.

340 has smaller mains, giving slightly reduced friction. As well as a shorter stroke, possibly reducing windage.

340 has slightly bigger bore, giving slightly less valve shrouding. IMO this is splitting hairs.

340 has a better rod/stroke ratio for high rpm, but in 99% of applications this benefit isn't even measurable since it only becomes relevant at extreme rpm which is $$$.

That's it. These factors aren't even worthy of consideration for most builds.

On the other hand, the 360 has advantages that are basically always relevant, and always be realized.

20 more cubes is almost 6% larger in displacement. That basically means 6% more torque.

Then additionally, The 360 is also far more plentiful and affordable. They made them until 2001!

Bottom line, there may be exceptions to the rule. But as a rule any theoretical architectural advantage of the smaller 340 for extreme rpm development is more than offset by the 20 cube disadvantage which is quite substantial.

340's are cool.
But a 360 makes more sense if you wanna make power.