Can't comment on the small bores but do have some personal experience with both 276 and SW5 cams in big bore blocks (two 276 in 1380s and the SW5 in a 1430. The first 1380 with a 276 was a Slark engine in my Dads Woody. Did approx. 130hp and lasted 50'000 kilometers. Fantastic engine considering the heavy tuning. Very nice driveability even at low revs (tame as a lamb) and then almost literally explodes at around 3000rpm. Very sexy driving. Requires high idle though, 1100rpm or more.
My own Clubby Estate is running a similar setup by Rosslin Racing. Behaves similar too, goes like a rocket starting around 3k rpm, requires 1100rpm idle and is fairly cammy down low. Not the kind of cam you want for driving in traffic jams, but country roads, oh yes please.
Last but not least, my Dad's Cooper S 1430cc with an SW5 is amazing accross the band. Idles normally and pulls like an ox from the first twitch of your toe. Almost scary to drive as a result as it launches off so fast.
I guess it really depends on what you want. I personally prefer a rather tame low rev performance as it allows for more "civilized" driving in populated areas. Then again, if that is not your concern, the SW5 is probably one of the best all-round cams available.
have you got the spec of the 1380 and the RRgraph? a 276 is a mild road cam and imo you cant get 130 bhp using a 276 its hard enough with a 310 scatter race cam
