Would you recommend bushing the lifter bores on a mild 400 horsepower street 400/451 stroker?
Depends upon what cam gets installed. Most likely not on a mild build but keep in mind a lifter bush job is less expensive than a full rebuild from a wiped cam if going flat tappet.
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What's the longevity of the bronze bushings? Might they last 100k miles or more in the said street engine if properly maintained?
Ampco bronze needs less lubrication than cast iron to not wear. As long as there is pressurized oil to the lifters, I don't see a longevity issue on a street car.
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My only real concern with the bushings is if they ever came loose from the block.
