I would say, if you do not see the small holes in the sides of the air horn and the jets and metering rods are not the correct size, then you have no modification. I own two 300C's and have owned 6 or 8 sets of 300C carbs and have yet to see a set that was already modified. George _____ From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of c300c@xxxxxxx Sent: Monday, December 15, 2008 09:47 AM To: Chrysler300@xxxxxxxxxxxxxxx Subject: Re: [Chrysler300] 300 c carburetor modifactions Vince, How do you know your carbs haven't already been updated? I have owned many 300-Cs and the modifications had all been made. There was a carb modification kit in 1957 that dealers used to cure 'stumbling on turns' complaints in the early carbs. If your 300-C is later production, I would venture to say the mods have already been made, especially if you have no 'stumbling on turns'. Gary Hagy 300-C coupe 300-C conv. In a message dated 12/15/2008 8:58:05 A.M. Mountain Standard Time, vhelbling@tampabay. <mailto:vhelbling%40tampabay.rr.com> rr.com writes: I would like to try the modifications described in the Chrysler TECHNICAL BULLETIN #364 (or 384) dated 7/18/57. The change involves installing (4) metering rods #75-1160. Does anyone know a source? Or can anyone tell me the diameter of the rod at high speed (small diameter) and low speed (large diameter). Is there a cross reference chart available that shows chrysler numbers vs carter numbers on the metering rods. Does anyone have any info how this change worked in their car, especially regarding idle? I think I read somewhere that this change was incorporated into carburetors for 1958. Anyone have any advice? I have the motor on a running stand in the garage and will happily post results if I can get enough parts and info to try it. If the change is already in the 58 carbs, I could trade my spare 57 carbs. Vince in tampa bay [Non-text portions of this message have been removed] ------------------------------------ To send a message to this group, send an email to: Chrysler300@ <mailto:Chrysler300%40yahoogroups.com> yahoogroups.com For list server instructions, go to http://www.chrysler <http://www.chrysler300club.com/yahoolist/inst.htm> 300club.com/yahoolist/inst.htm For archives go to http://www.forwardl <http://www.forwardlook.net/300-archive/Yahoo> ook.net/300-archive/Yahoo! Groups Links **************Make your life easier with all your friends, email, and favorite sites in one place. Try it now. (http://www.aol. <http://www.aol.com/?optin=new-dp&icid=aolcom40vanity&ncid=emlcntaolcom00000 010> com/?optin=new-dp&icid=aolcom40vanity&ncid=emlcntaolcom00000010) [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] ------------------------------------ To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Chrysler300/join (Yahoo! ID required) <*> To change settings via email: mailto:Chrysler300-digest@xxxxxxxxxxxxxxx mailto:Chrysler300-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/