[Douglas S.]

Originally Posted by gimmesomerocks

thats why I was hoping for some sort of cross breed for a cam. something that sounded good @ idle, but still maintained the low end torque I will need. (no racing here)

what are the benefits of doing the swap of the 4.0L head?

It is a horsepower boost. I am very glad I did it.

[stoneywaves]

Hey
I just had my engine rebuilt with an rv cam(ELGIN pro stock E-1122-P), heavy duty springs, bored 40 over and I am not happy with the way my 83 cj7 accelerates. It is not responsive enough in my opinion. How do you know if the builder "_ucked up". I think that I may have put my jeep in the wrong hands. He chose that cam. I had the carb rebuilt (Carter bbd) so it is running good for that carb. And I am getting worse gas milage than when I had a poorly running carb and a blown head. For real - I am getting on aveage 10-12. The engine has about 700 miles on it. If anyone needs additional info I will find out. I want to make it FI (CALI), but I want to make sure that my engine is properly built. And not just put together and runs. If anyone can give me some solid advise, direction, etc. it would be greatly appreciated. Also I can't make my own post. IF someone could pm me that would be great.

[swatson454]

I'm impressed with some of your Comp Cams selections guys. Good stuff! Comp Cams also has a Muscle Car series, at least I think that's what it was called. Anyways, they have delayed the exhaust valve closing timing and I believe they spead out the LCA towards the exhaust side a little to achieve a more aggressive exhaust sound without the obvious challenges of just making the whole thing bigger. I don't know, and really doubt, if they make an I-6 profile in that series but it may be worth looking into.

I'm also a huge Barry Grant Demon fan and am looking into their Street Demon two barrel. Although I haven't talked with their tech guys yet, the carb seems to fall in line with our 258 displacment. Something else to consider...

[Lawless_Jeep]

Originally Posted by stoneywaves

Hey
I just had my engine rebuilt with an rv cam(ELGIN pro stock E-1122-P), heavy duty springs, bored 40 over and I am not happy with the way my 83 cj7 accelerates. It is not responsive enough in my opinion. How do you know if the builder "_ucked up". I think that I may have put my jeep in the wrong hands. He chose that cam. I had the carb rebuilt (Carter bbd) so it is running good for that carb. And I am getting worse gas milage than when I had a poorly running carb and a blown head. For real - I am getting on aveage 10-12. The engine has about 700 miles on it. If anyone needs additional info I will find out. I want to make it FI (CALI), but I want to make sure that my engine is properly built. And not just put together and runs. If anyone can give me some solid advise, direction, etc. it would be greatly appreciated. Also I can't make my own post. IF someone could pm me that would be great.

What are the cam specs and operating range?

[stoneywaves]

Hey lawless
Okay my specs are can lift .280, Valve lift .421, Lobe ctrs. int. 110 exh. 114, lash hot hyd, sae dur. 280, .050 dur 208, sae timing btc 28 abc 72 bbc 72 atc 28, .050 timing btc -6 abc 34 bbc 38 atc -10

[stoneywaves]

Hey lawless
operation range 1500-4000

[243]

Not a 258 but an inline six, if this is the sound you are looking for I believe you will be very disappointed in the long run.

http://www.youtube.com/watch?v=ucUj93UySTQ&feature=channel

I bought an 81 C10 with a 305 back in the late 80's that had a huge Comp Cams stick, single plane Edelbrock intake and a Holley 600. It was an incredible dog at anything below 3500 rpm and 70 mph. I replaced the cam with a Comp Cams RV model, the single plane intake was replaced with a Edelbrock Performer and the truck would boil the tires off the line even with 3.08's. It was a pleasure to drive and could be used as a truck again.

As much as I like the sound of the inline six in the Youtube link, it would suck to overcam a Jeep.

[Lawless_Jeep]

I tried to find an AMC camshaft on Elgin's website but couldn't find one. Based off of the specs you gave, you're running slightly more than a stock cam. You won't notice a whole bunch of difference with the grind your builder chose. If your gas mileage is suffering, I doubt that it's the cam that is causing it. From working and adjusting my engine, I've found that nearly all the mileage came from a good carburator tuning. It takes patience to get it right. Mind you, I'm running a Holley and you're running the Carter and adjustments will be different. There are some really great threads about tuning the Carter on here. I would look in that area first. I went from 7 mpg to 14 with simple carb tuning.
The cam that I'm running doesn't come in until 2500 rpm. I can pull off the line tons better than I could with my stock setup, and there's not many V8's or diesel powered trucks that I cannot pass going up a hill when I'm operating within the cam's power range.

Tim

[243]

^^^ that was not directed at you Tim. Just a precautionary statement about moving the powerband up to high in the rpm range in general.

[Lawless_Jeep]

Originally Posted by 243

^^^ that was not directed at you Tim. Just a precautionary statement about moving the powerband up to high in the rpm range in general.

Oh no, it's cool. You're absolutely right. It is all determined on what the person intends to do with the vehicle. Me, I use mine as a daily driver that basically never sees the offroad. I built mine so I could tell the V8ers that the were just dusted by a straight six. A person that hill climbs or rock crawls would most definitely want to keep the powerband reasonlably lower in the rpm range.

[stoneywaves]

Thanks Tim,
It is an elgin pro stock e-1122-p. If you put - catalog.elginind.com You will be in the right place. But I believe you already answered my question and concerns.

[Lawless_Jeep]

Originally Posted by stoneywaves

Thanks Tim,
It is an elgin pro stock e-1122-p. If you put - catalog.elginind.com You will be in the right place. But I believe you already answered my question and concerns.

I hope I was of help. Keep us updated.

[swatson454]

I know this will stir up some dirt on here, but once you've cammed your engine, you must recurve your distributer and switch over to manifold vacuum and adjust the canister accordingly if you're remotely concerned with low speed performance and mileage.

Timed or ported vacuum was used as a means to control emissions output on a stock engine and can really hamstring performance.

[TylerCJ7]

I wanna see how that thing accelerates with 33's and a dyno sheet. I'm not saying you're not making that much power, I just envy your motor. I want my 258 to be like your 262 one day, when I have money.