BruceH
BBB Big Bore Boss 322
I had the Comp 127300's installed Wednesday,, The drive pretty much like the stockers ... They do have a little rumble, and did lose about 8-inches of vacuum at idle and a little less than that driving which has caused the brake pedal to be a little soft ... but they did dyno very good,
They picked up 20lbs of torque stating at 3800rpm (435) ,, hit a peak of 466 (+13 from stock) and gained 30lbs over the stock cams at 6400.
HP wise,, They 'only' gained 22 on the stock cams but I am still running the cast iron stock exhaust n' cat's and the stock Roush TVS intake and paper Motorcraft air filter. My tuner said those cams would've gained more HP with a set of headers and an open CAI,,
I'm satisfied with 507 and 465 on the stock bottom end ...
Good luck with you build ... I'm probably not too far behind ...
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At one time I was whippled and installed 127300 cams. The peak numbers were increased but the real story was under the curve. Gains on the averages were impressive imo. Plus the upgraded springs allow higher rpms.
BTW if you build before blowing the motor you can get some cash out of your block or use it for the build