Re: [Amc-list] Weber Carbs for the 258

[Frank Swygert <farna@xxxxxxx>]

Definitely NOT "too much carb"!! They were probably talking about the much more common and comparatively cheap (about half the price new or used!) 600 cfm Holley. The only people who have successfully run a 600 cfm vacuum secondary carb are racers (usually mud or sand racers) who run the engine in the higher rpm range a lot. 500 cfm is considered the max for a 258. 

I'm running a 390 it the 258 could definitely use a little MORE carb. The big killer I believe is the very conservative stock cam though. After my experience with this Holley 390 (vacuum secondary, but blocked to force coming in at about 1/3 throttle opening) and Clifford intake I'd start with a 450 cfm carb. The only used ones I found were made for a choke coil in the intake on V-8s though, and I didn't want a manual choke. No electric or carb mounted conversion for those carbs, so the only option would have been manual. I know how to use a manual choke, just prefer electric. If I had to do it over a gain, however, I'd just use a manual choke. 

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Date: Tue, 06 May 2008 22:28:57 -0500
From: Todd Tomason <jayscore@xxxxxxxxxxxxx>

I've never used the Clifford intake with the 390 Holley, but I've been told by 
several people that it's too much carb for this engine.  


-- 
Frank Swygert
Publisher, "American Motors Cars" 
Magazine (AMC)
For all AMC enthusiasts
http://farna.home.att.net/AMC.html
(free download available!)

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