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273's were all solid lifter motors. If he wants to do a small hydraulic swap he will need push rods and a set of hydraulic rockers from a 318. I used a 284-484 Mopar Performance cam in one and it ran pretty good.



Not the 68 and 69 273s, they were all hydraulic. You can run the adjustable rockers, but the stock pushrods won't be the correct length. The easy thing to do is swap to the non-adjustable rockers and corresponding pushrods.