Not to sidetrack the OP's post about thanking Jay for this great site, which I agree with 100%, but about the BBM post; Blair already did a pump gas 482 that made 666 peak HP, and made over 600 from 5000 to 6500 RPM. Link here:
http://fepower.net/simplemachinesforum/index.php?topic=2829.0That was advertised as "very minor hand blending immediately under the valve seat" and no other port work of any kind. Of course it was probably a very professional blend, but with 40 more cubes to feed, and a bit more experience on BP's part with the BBM heads, I've no reason to doubt the numbers posted on the 520 engine. This is JUST a guess, but I would assume that Blair informed them that with a minor blend, HP numbers would be noticeably increased. That stands true for just about ANY head. No intake was mentioned on the 482", and this was before the BBM Tunnel wedge intake was produced, which one could safely assume helped with the power production of the 520".
BBM has a tendency to state things with a bit of sales hype which doesn't always go over well with the older "experienced" guys in the FE community, but all the facts seem to back up those claims. Nobody has said one bad word about their products except for availability of certain parts, which is common among ALL parts producers of FE products (except for maybe Jay's parts), and everyone who has used them praises their quality. Maybe the 520" would have lost 20 HP with no blend, maybe 30...or maybe 15, I don't know, but the fact that their products make some seriously STOUT power with minimal work seems to be obvious to me.
I have no BBM parts and have not seen any, so I'm not trying to hype a product. I got my SOG block just before BBM announced their new block, so I don't have a use for one either. I
do believe that Blair probably squeezed more power out of it than
most builders could get with the same work, which is why Werby has what he terms "The Blair Factor" for his Gonkulator. For some people, that's just a hard pill to swallow.