They can be removed and replaced with studs - it greatly helps with getting the whole works hanging off the side of the head to bolt on.
If I remember right, they're just threaded in.
-Sam.
1967 Chevy II, 2-door post.
250, 3-OTT.
1969 GMC 1/2-ton.
307, 3-OTT.
DD.
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