I just sent you a note that I think will help. (In my haste, I thought you said bent pushrod, so I'm leaving the pushrod note as it was written, but at the end I'm adding info about the lifter you mentioned)
Also, when it comes to bent pushrods, Curt Hill is the man. Curt has gone all through his 427s and has replaced more than one bent pushrod.
Here are some of his threads from our MASTER INDEX
38’ Complete Restoration Project and 427 tune-up, Curt Hill, Portland Oregon (Lots of Photos)
http://www.network54.com/Forum/message?forumid=424840&messageid=1125521461
http://www.network54.com/Forum/message?forumid=424840&messageid=1125793376
http://www.network54.com/Forum/message?forumid=424840&messageid=1127439175
http://www.network54.com/Forum/message?forumid=424840&messageid=1128661264
As it turns out, a bent pushrod isn't that big of a deal. They're very inexpensive too.
If I can get Curt to respond to you, that would be the best advice in the world! I'll send him an email.
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A bad lifter, eh? Hmmm. solid lifters don't normally go bad. 427 marine engines have solid lifters. I'm assuming you're asking about a marine 427.
Lifters "can" be removed without pulling the heads or intake manifold, "if" they are not stuck, and "if" you have the proper device, and "if" the mechanic is capable and has a little luck too. If you drop one inside the chamber under the intake manifold, they're tricky to get out, but the photo below is proof it can be done.
Here's the thread you need to see!
http://www.network54.com/Forum/424840/message/1126327053
Here's the solid lifter that came out, without pulling the head or intake manifold.
Hope this helps!
regards, Paul