its running rich the  whole rpm range. got a oxy sensor on chassis dyno. these carbs dont have removable secondary jets. the tuner says he cant lean it

got my 427 hi riser 2 carb engine running with 2 holly 600 carbs. its running way too rich and these carbs dont have replaceable secondary jets.  its only getting about 330 hp at 5k. i think 1200 cfm may be too much ? would quick fuel 450's be a better choice ?

solved the problem i think. bought msd starter saver that retards initial timing during startup. teeth arent breaking off anymore.

Broke these starter teeth clean off. Is the problem related to too advanced initial  timing and a really strong starter? Theres no wear on the teeth, just broken off. Hard to believe the starter could do that. Its a powermaster w reduction drive.   

At precisely 5800 rpm my fe hits a wall and loses power. Feels like a rev limiter but worse. I have a hydraulic roller cam from comp cams. I thought it was my old dual point distributor so I bought msd distributor coil and box. Same thing at at 5800 rpm. The engine builder told me that the flat tapped valve springs that were on the heads originally were fine so he did not install new springs. He says it's not related to the springs but still has no answer for me. The old springs were about 10 years old on a non running engine so several valves were open for that long. Could these springs create this 5800 rpm fall off? What does valve float feel like?

A friend of mine bought a 427 sideoiler highriser single 4bbl with everything..iron headers dist carb t10 and it wad running. He paid 7k

Has the crank been turned .030 already? If you cut it more it might be less than optimal.