I have a 94 Z28 with the LT4 Hot Cam kit installed. The kit cam with 1.6 roller rockers, springs, shims, and the cam. I also replaces the lifters. For some reason, unknown to anyone, I have broken my timing chain not once, not twice, but three times! The first time, with the engine stock, I took it to a mechanic, and he told me the resone was that GM had not but the pin in the front of the cam that takes the stress off the timing gears bolts. Well, here I am.. Another broken chain. I've used a stock, one from DynaGear, and one from GM. Any suggestion on what is causeing this, or what to do? I am at a loss

 

Perhaps your crank is badly out of balance. How that would happen I do not know. Are all the bolts on the gears torqued down the same?

 

I suspect you have a bind in the top end somewhere. Is your valvetrain set to tight? Im just throwing out a guess here..

Can you free spin the bottom end and the top end? When my grand am broke two timing gears in a row I found the top end was seized up. The gear would take the pressure for a while..but not very long.