My caps are just regular plastic caps with a red anodized cover on them ,,,,,AutoZone for about 5 bucks .I got new caps for my car right after I got it, they say HEMI on them. They are fine, no problems at all. As Lou says, make sure you have no problems with the metal. I got mine from Summit, Hot Rod Catalog.
I wouldn't expect those to cause any problems. Check them frequently at first, but they sound fine.My caps are just regular plastic caps with a red anodized cover on them ,,,,,AutoZone for about 5 bucks .