Just curious if there exists a form of adjustable push rods, to adjust the length that is. My cousin says I might be able to use some from a Harley. I suppose I should explain a bit. I had the block decked and head shaved a small amount when I got the car, along with the cylinders bored out some. It ran great when I got it put together, aside from the 30DICa not wanting to idle. A short time after, maybe a month, the rocker studs were pulled from the head some causing the rocker to snap. It was then I realized I neglected to think of the push rod length. What options are there to avoid the same happening in the future? I just got a different head, and had new valves, guides and seats and all shined up, ready to install. Shims under the rockers, multiple head gaskets, one thick copper gasket...I'm considering it all.