Biggest problem you're going to have with the Whip series is the coverstock. Ask Joe Firpo sometime what he felt about them when he was on AMF staff back then.

I had the Bull Whip, and on today's lane conditions it barely moves. The Ebonite-poured AMF balls are really hit or miss. I believe they poured the XS series as well and talk about hit or miss, I had all three and getting the surfaces usable was a chore in and of itself.

I'm sure others had different opinions, but I would characterize just about any Ebo-poured AMF ball from that era as suffering from Weak Hit Syndrome unless you paid particular attention to how you drilled it and how you tweaked the surface.

Jess

i have one like the ball that can be seen at the link i have provided at the bottom. it is in pretty good shape, it has some nicks, but i paid $14 for a bag, shoes, and the ball at a resale shop. i have thrown it a few times, i think with some minor tweekings it's a keeper. my only dislike is that it is 15lb and i throw 16lb stuff.

http://www.bowlingballvault.com/companies/1-amf/1292-whip-pearl
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Thank God my Son bowls so I can have a Hero!

Red/Teal Pearl Power Groove
Sapphire Zone Pearl
Sapphire Zone Solid
Blue Sparkle Gryphon
Black Shadow
Nitro
Whip Pearl

Here's a link for the Vortex V2 Power and it's the same core as the Whip Pearl!
http://www.bowlingballvault.com/companies/9-ebonite/985-vortex-v2-power
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"Train a child up in the way they should go and when they are old they will "Get MOTIVated, with a Big B cause a Storm's a brewing and not turn from it.
Bruce Campbell
USBC Bronze Certified Coach
IBPSIA Certified Technician
Originator of the -35deg x 25 leverage drilling!
http://www.motivbowling.com/products/2/
http://visionarybowling.com/?cat=4