I have this exact same cam in my 400 in my 79 TA. I also have a very similar issue. Motor just does to pull past 5400. The motor goes flat and get "jerky". Very unsmooth power. I am running an LM-1 and AFR is 12.5 to 11.5. I have tried 3 different carbs off buddy’s cars. Several timing curves. Total advance has been moved from 30 to 36 and still no difference in max RPM. I am also running the Pertronix HEI. I have tried there module and my MSD 6AL. I have swapped everything but the plug wires. I do not remember the part number on the springs but they were ordered per spec for the cam. I have also tried the MSD, Petronix flame thrower and Hypertech coils. No change. I have run out of parts to borrow off buddies cars. I am going to rewire everything to make sure I have adequate voltage and current to the system to see if it helps.
I have run a 12.20 @ 110 with 5200 RPM pill in the shift light. LM-1 shows shift was at 5400. Anything higher than this and the car slows down. If I try to stay in it to 6000 the motor sounds so bad breaking up that it sounds like it is going to come apart. Let me know if you come up with anything other than the cam. I am not apposed to going to a little more durration but I really dont want to do that on a whime.
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