The chrome ones corrode, and the pot metal stock ones warp.
I finally went to Napa and got a cast iron one. Haven't had problems since, but the key is a good gasket and flat clean surfaces. Fel-Pro #35562T. It's a reusable gasket, and you don't use tack or gasket sealer to put it in. Just shove it in and tighen it down. Done.
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'69 3/4 ton C20 2wd-350ci/TH400
'69 3/4 ton Custom 20 2wd-350ci/4sp Manual
'99 2wd 5.7 Chevy Tahoe
Seattle, WA.
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