With the exhaust valve closed, the cylinder intaked and fired normally, but couldn't exhaust. The exhaust rocker arm loosened up for whatever reason and rotated off the valve. Here's my theory - tell me what you think. What else should I check before I put a new pushrod in and readjust the valves? Any theory on how the pushrod may have bent? Thinking I may have wiped a lobe out on the cam, I put a straight pushrod on the lifters and rotated the crank by hand to check lifter movement - they seem to move as much as the adjacent cylinders, but I haven't put a dial indicator on it yet. I tried actuating the valves using a valve spring compressor and they both moved fine. After pulling off the rocker arms, everything except the bent pushrod appears to be fine. I pulled the valvecover on my SBC to find one exhaust rocker arm off it's valve (rotated out of position) and the same cylinder's intake valve pushrod bent. ![]() Can anybody give me some insight on how this happened and what to do next?
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