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Jeff Higgins Jeff Higgins is online now
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Join Date: Mar 2004
Location: Higgs Field
Posts: 22,837
Quote:
Originally Posted by speeder View Post
Good old Higgins, making friends on the internet.
Just trying to keep things straight, for anyone who really gives a rip's benefit. No ill will intended. Of course with guys like you who seem to always have a chip on their shoulders, and honestly believe someone else is "stalking" you here (re: your meltdown over varmint on the "how low..." thread), I suppose even "merry Christmas" could have negative connotations.

Quote:
Originally Posted by asphaltgambler View Post
To summarize the Thunder heads were really good for stock displacement Sporty that was not too highly modified - which was the broadest market intended. BUT they were very expensive, relatively speaking, at the time and sales were not what the company had hoped and ultimately went bankrupt.
Any idea how many were made? I do see these come up for sale periodically on the various H-D forums. Big, big bucks...

So, which would ultimately make more power, Thunderheads or XR1000 heads? I remember when the old XL List guys tried to regain the land speed record for stock 1000 cc pushrod twins from some guys who set it with a Guzzi. They tried and tried at Maxton (and possibly Bonneville) and finally gave up on any kind of Ironhead. They could not use the Thunderheads in their class. They then went to an Evo based bike and quite easily regained the record. That tells me even the twin carbureted XR1000 heads won't make Evo levels of power.

Unless, of course, one removes the aircleaner, like Speeder...
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Jeff
'72 911T 3.0 MFI
'93 Ducati 900 Super Sport
"God invented whiskey so the Irish wouldn't rule the world"
Old 09-20-2014, 06:02 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    #56 (permalink)