I have a Gray Marine V8CH-220 in a '64 Lyman. I have not started the engine. I probably has not been started for several years. Out of curiosity, I removed the valve covers to inspect the cleanliness of the valve train. In doing so I noticed a bent pushrod. Striking the top of the valve stem wiith a rubber mallet, the valve does not appear to be stuck. I removed the rocker shaft and replaced the pushrod. Thereafter I cranked the engine and heard an obnoxious metallic, snapping/slapping sound coming from the bore of the pushrod I replaced. Any ideas on what's causing this and what I should do? By removing the intake can I access, remove and replace the lifter? Thanks in advance for your help.

