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454's are low compression motors and are not Zero clearence.
If the timming chain broke the there is usualy not a problem with valves getting bent. The noise may have been the timming chain balling up around the crank gear.
Don't write it off till you check. Pop the cap off the distributor and watch the rotor and see if it turns when you turn the engine over by hand. If it doesn't then drop the pan and check the bottom end.
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Grim-Reaper
70 Pontiac LeMans Sport Convertible, worlds longest resto in progress
Looking for 71-72 2wd Blazer or Jimmy Project
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