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I hesitantly replaced my old all brass rad with a plastic/aluminium Spectra #730. An all brass rad was hard to source and double the price. My 454 has been running fine with the #730.
That's what I had until it developed a crank along the tank. Pulled it to get it fixed but some pillhead stole it before I found a rad shop
Now I'm running a plain jane 350 rad. I'd duct tape and permatex an old rad before I trusted a plastic tank "upgrade"!