not such the case.. I got a friend who has a 347 in his 95 mustang and had it in for the last 80000 and still goin strong it's his daily driver too....talked to him the other day and it doesn't blow the blues either

 

how does the cubic inches matter?

street able is a relative term? the cam is dependent on streetability, ac, etc etc you don't have to have a extremely aggressive cam. Thats also why its important to talk to a cam designer and tell them your goals with the car. They can make a cam specifically for your cam and it can idle similar to stock if not stock

there isn't really a reason not to go a 347

 

LMFAO thats funny dude. you need to talk with FullAuto.

and yeah there is no replacement for displacement, but a shorter stroke WILL rev faster - and is the advantage a 331 has over a 347. ya gotta pick your battles and decide which is more important.

im giving up 13 inches in my 302 / 289 swap, but IMO those 13 cubes are worth the better rod/stroke ratio.

 

my77 is correct, but 347's make a few more tq #'s down low to pretty much make up for it. with a big cam and intake and heads to match a 6k-6500 rpm revving 347, will be one hell of a ride. i got a 331, i like it.
a 347 can be a dd, they may not last as long as a 331, but its all in the builders skill and knowledge and alot of good luck. a high performance motor should not be expected to last as long as a stocker motor, sometimes it happens, others it dont. if your making hp, then ur breaking sh*t, and if your not breaking stuff then you over built ur car. lol enough ranting LOL