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258 cam specs??

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5spdwagon View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 5spdwagon Quote  Post ReplyReply Direct Link To This Post Topic: 258 cam specs??
    Posted: Oct/14/2018 at 8:39am
Does anyone know what the cam specs are on a 1983 258 would be. Looking for some info before I tear into this. Looking for a cam pretty close to orginal as I can get.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote matty 401 Quote  Post ReplyReply Direct Link To This Post Posted: Oct/14/2018 at 9:00am
http://www.angelfire.com/my/fan/Jeep4.0Camshafts.htm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 5spdwagon Quote  Post ReplyReply Direct Link To This Post Posted: Oct/14/2018 at 9:24am
That’s some good info. Thanks
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Post Options Post Options   Thanks (0) Thanks(0)   Quote matty 401 Quote  Post ReplyReply Direct Link To This Post Posted: Oct/14/2018 at 11:12am
no problem 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ollie Quote  Post ReplyReply Direct Link To This Post Posted: Oct/14/2018 at 11:55am
Mike,
I too am searching for a cam on my 258 build.

I have been reading all the old posts by Uncle John that i can find. I found one that he said he wished he would have used a Isky 262 Super Cam rather than a 256 on his 258.

I am looking at the chart and i have no idea what it means. I want the valve train stock.

Having AMC Fun,
Ollie


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Post Options Post Options   Thanks (0) Thanks(0)   Quote 5spdwagon Quote  Post ReplyReply Direct Link To This Post Posted: Oct/14/2018 at 12:00pm
I can’t decide what I want to do with ours yet.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Pdok Quote  Post ReplyReply Direct Link To This Post Posted: Oct/14/2018 at 5:28pm
Well, I gotta say upgrading the cam is a major plus, even with leaving the rest of the car stock.  I'd go with as much lift as you can stand, but under .500.  I prefer the split pattern cams, but there's plenty of people loving the old school cams too.  For simplicity, cams that allow you to use stock springs (lower spring pressure/rate) would be a good choice, but there's good power potential if you're willing to also upgrade springs to accommodate a larger cam.

I'd move well away from stock replacement cams, frankly, since they were so anemic.  This is a big opportunity, and will define the rest of your experience with that engine.  In my case, the cam upgrade was way more noticeable than the 4.0 head swap.

On stock intake/exhaust, something in the .425 to .450 lift range would be plenty.  You will need to consider carb/timing/ignition upgrades to achieve full potential from any cam upgrade.  That's an easy one, though.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 232jav3sp Quote  Post ReplyReply Direct Link To This Post Posted: Oct/14/2018 at 8:32pm
I have a Comp 260h in my Javelin's 232, and while I've only gotten to drive it maybe 10 miles, it felt much more likely then the Lunati Voodoo I put in my Rambler. The Lunati I used is their smallest (208/213 @ .050) as I was concerned about the stock M35 converter. It has so much more power then stock, but, now that I have the T5 I'm wishing I had the next cam in line (213/220). The shaft rocker head doesn't help matters. I suspect that both of my cars would rev out a good deal more with a later bridged rocker or the 4.0l head.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote FSJunkie Quote  Post ReplyReply Direct Link To This Post Posted: Oct/15/2018 at 4:05am
I suggest keeping to the stock cam grind if you are retaining the stock computer engine control system. Who knows how the computer may react to a different cam. It's primitive enough that it may not notice but it's best to not find out the hard way.

The 1 barrel carbureted 232 and 258 use a shorter duration cam (SAE 259*, or 185* @ .050). Melling's part number for this cam is the SRC-6.

The 2 barrel carbureted 258 uses a longer duration cam (SAE 262*, or 190* @ .050). Melling's part number for this cam is the SRC-8.

The stock cam for your engine is therefore the SRC-8. I mention this because many places tried to sell me the SRC-6 when I was rebuilding my 1984 258. That is the improper cam. Granted, there isn't much difference between the two, but the SRC-8 is technically the correct stock replacement cam and the closest match to the original cam. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 5spdwagon Quote  Post ReplyReply Direct Link To This Post Posted: Oct/15/2018 at 7:59am
I don’t have a computer on mine. It’s in a 69 Rambler. Been in there for 10 years now.
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