I have the single shaft T&D on my 440-1's. .830 lift 325lbs on the seat and boost on top of that. never had a failure driving it on the street or racing it. Something is wrong in your valve train.

are they hitting the retainer on the inside of the rocker? How much valve clearance? hows the geometry? coil bind? Valve float?


BB, TT5,Procharged 3300lb Street Car 4.79/154