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Hello-
There aren't any mushroom-style hydraulic lifters around.
In Mexico, they use the cylindrical T4-esque hydraulic lifters in cases with larger lifter bores (24mm nominal diameter), and correspondingly more casting material around the lifter bores.
I am a fan of hydraulic lifters for what they are (i.e. not lightweight, not good above ~6500-7000rpm, but great for maintenance reduction and greater lifespan of parts). However, installing hydraulic lifters into an older T1 case can cause a problem... the material around the lifter bores becomes very thin very fast.
Many (all???) new cases have more material around these sections, as the same casting that's used for production hydraulic engines is used for our solid lifter replacement cases. If you have one of these, then hydros are groovy. If not, then I'd either pass or get a different case.
Take care,
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Shad Laws
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