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258 - 4.0 cam swap |
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Scrapdaddy Sr. 
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Joined: Aug/05/2007 Location: Florida Status: Offline Points: 941 |
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 Topic: 258 - 4.0 cam swapPosted: Jun/03/2009 at 7:12pm |
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Hey Guy's I just picked up a brand new still sealed in the box COMP Cam for only $50.00.
The specs are: 262 duration with 4:47 lift and 112 lobe separation. This for a 258 but will it work in a 4.0? Also will I need to change the valve spring with this lift in a 258 or can I run it with the stock 258 head until I can get hold of a 4.0 head for my 258? |
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poormansMACHINE
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Charter Member Joined: Jun/28/2007 Location: Shoemaker-Levy9 Status: Offline Points: 12302 |
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Posted: Jun/03/2009 at 7:31pm |
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I wouldn't run it with an old stock set of 258 springs, locks and retainers.
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billd
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Forum Administrator Joined: Jun/27/2007 Location: Iowa Status: Offline Points: 30894 |
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Posted: Jun/03/2009 at 8:16pm |
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Fuel injection cams (4.0) and carb cams (stock 258) are typically different..... work but not really be effecient. So even if you put a 4.0 head on the 258, if you use the EFI, it won't be effecient for it, but a 4.0 with carb would be fine. And what pmm said above... |
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poormansMACHINE
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Posted: Jun/03/2009 at 8:32pm |
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Forgot to ask, but new lifters with it?
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billd
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Posted: Jun/03/2009 at 8:44pm |
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I've got some good used 4.0 lifters....
But you don't want 'em on a new cam.
Only new lifters on new cam. Edited by billd - Jun/03/2009 at 8:45pm |
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poormansMACHINE
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Posted: Jun/03/2009 at 8:51pm |
An oxymoron  |
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SIXPAK
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Joined: Apr/05/2009 Location: Ohio Status: Offline Points: 56 |
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Posted: Jun/03/2009 at 9:56pm |
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Usually the only difference between FI cams and Carb cams for the same given application are the FI cams typically use a wider lobe seperation. This is done to make the computer a bit happier by reducing overlap and having a stonger vac signal.
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Sand is for Racing Asphalt is for getting there!
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Scrapdaddy Sr.
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Posted: Jun/03/2009 at 10:25pm |
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Thanks to all!
The reason I asked about the working in a 258 as well as a 4.0 is I plan on installing a 4.0 in place of the 258 eventually and wanted use the cam in the 4.0(with new lifters again?) with a carb set up. Stock 258 with 2 BBL = 110 HP Stock 4.0 with carb = 185 - 195 HP on average, + Turbo with 12 lb boost 285 HP(estimated) 4.0 wins! 4.6 on boost really wins!! but that is later. I plan on new lifters, timing set and now new springs and retainers. I'm assuming the idle will be a little lumpy due to the duration, lift and small overlap? Oh.... Also cleaning up the ports a little while the head is off. I know it's probably futile to work on a 258 head but still going to clean it up some. Do you think a 500 CFM Holley 2BBL is to much or to little? Planning on having a machine shop mill out the ports of the intake(where the carb sits) to the same diameter as the Holley/ Motorcraft(?) ports. There is enough metal and room between the studs there to pull it off. Edited by Scrapdaddy Sr. - Jun/03/2009 at 10:32pm |
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firefly
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Joined: Dec/23/2008 Location: wi. Status: Offline Points: 355 |
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Posted: Jun/04/2009 at 6:06am |
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You can buy a transdapt adapter from summit to adapt the carb.for about 12 bucks.
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billd
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Posted: Jun/04/2009 at 7:04am |
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A lot of Jeepers have put 2100's on their engines........... I had the adapter part number around somewhere, but 12-15 sounds about right. A nice looking adapter.
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billd wrote: