Used a socket head screw (fits a 1/4" bit), a cheap Harbor Freight drift that fits fairly tightly into the socket, and my BFH.
A few whacks on the top of the guide and they're out.
No visible harm to the block.
I was more worried about the drift slipping and possibly contacting
the lip of the valve set. Fortunately that didn't happen.
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I busted one of those drifts off in the socket head with a misaligned hit. No problem, just picked up another drift and finished the job.
The guides on the exhaust valves seems to be a little more difficult to bang out of the block than the guides on the intake valves, but that was not a show stopper.
Hope this helps
