Re: BBC Hyd. Roller cam?
Therer is no reason, with todays technology, that a Hyd Roller with the same numbers won't equal a solid roller. Hyd Roller Cams are one of the all time great inventions.
With a Hyd Roller, I would go for more lift and less duration for a real street engine. My 540 that I am picking up next week will have 675 lift, 234-238 at .050 with 10-1. I went with the AFR 290 full CNC heads. The FLOW numbers that they produce at 600 lift are reaLLY OUTSTANDING, and the port velocity is up there from idle all the way to 6200.
You don't need a 7000 rpm port and cam for a 6000 rpm engine. By matching the components well, you can achieve the maximum good out of what ever you choose.
Also, there are so many cylinder heads out there now that your eyes glaze over just looking at the ads. I went with a proven product that backs up their claims with real numbers, and real life performance. Yes, AFR heads does cost, but this is one instance where I think it is money well spent.
My advice would be AFR 290'S if your budget allows, or a Brodix equivelent, custom Hyd Roller with no more than .232 at .050 on the intake and not less than .625 lift, the best rockers you can afford, (I used the Comp Cams Super Pro Magnums), have the block deck plate honed, and put it together right. That will give you close to 600 HP and an equal amount of torque, all in at about 6200. The curve will come in low and stay flat. It will be a tire shredder.
Don't fall for the old more is better. If this is truly a real street engine, you will love the 14 pounds of vacuum at 800 rpm idle, and the mild manners, that is, untill you kick all four barrels in from about 10 mph. Hang on.
'67 Chevelle Malibu, Catalina Blue, 540 inch Rat, Air Flow Reasearch 290 CNC Heads heads, Custom Hyd Roller, .675 lift, 234, 244 at .050, Lemons Headers, TCI 6X 6Speed Automatic, 12 bolt Posi, 3:31 Richmond Gears, front and rear power disc brakes, Global West Suspension, etc.