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Unread 10-16-2011, 06:15 AM   #31
papa355
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Quote:
Originally Posted by kw89425 View Post
9-10 ish..

my 1999 dodge 2500 360 4x4, only gets 10.......lol, my 1 ton chevy with a vortec 350 gets 12. Hell my boy's 355 sbc camaro only got 6 ( maybe coasting, lol)) guess I may as well drop a 496 in all of them.

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Unread 10-16-2011, 08:07 AM   #32
ctappan94
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cory.. no one likes you
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Unread 10-16-2011, 08:45 AM   #33
AFRd_CJ5
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What are you really trying to do? Being "unique" isn't enough description. Are you actually going to try and use all the HP you want to make, or just to brag? BBC isn't always the best choice. HP isn't the only factor to consider if you're trying go fast.
My stock frame CJ (no bracing/etc. of any kind) has a large number of power put through it and is still going. But, that has little to do with it if you're trying to build a 10,000HP motor just to open the hood and say "look at this!"
Headers would be my last concern. If you're contemplating some big HP swap, plan on having GOOD headers built. I wouldn't see that as a cost issue if you're trying to build a big HP setup.
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Unread 10-16-2011, 11:56 PM   #34
kw89425
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Quote:
Originally Posted by papa355 View Post
my 1999 dodge 2500 360 4x4, only gets 10.......lol, my 1 ton chevy with a vortec 350 gets 12. Hell my boy's 355 sbc camaro only got 6 ( maybe coasting, lol)) guess I may as well drop a 496 in all of them.
well you know i can pull that down to 4 or 5 pretty easy, but i havent really put my foot in it very deep yet
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86 cj7 496 powered 465/205 ton axles 38.5 boggers

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Unread 10-17-2011, 12:07 AM   #35
BagusJeep
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Very heavy motor = heavy front end = no handling = more mass to move

The 258ci was a "lightweight fuel efficient engine" in AMC terms but was still heavy and short on go.

I can understand wanting more power but for most situations a heavy block will be a drawback and you will not be using that level of power very often, if at all.

We can manage very well off road with 100- 150 hp because it is gearing and technique and common sense. If I had 500hp I think I might just end up doing doughnuts.

Still, depends on what you want to do with it and what floats your boat.
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Unread 10-17-2011, 12:17 AM   #36
kw89425
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Quote:
Originally Posted by BagusJeep View Post
Very heavy motor = heavy front end = no handling = more mass to move

The 258ci was a "lightweight fuel efficient engine" in AMC terms but was still heavy and short on go.

I can understand wanting more power but for most situations a heavy block will be a drawback and you will not be using that level of power very often, if at all.

We can manage very well off road with 100- 150 hp because it is gearing and technique and common sense. If I had 500hp I think I might just end up doing doughnuts.

Still, depends on what you want to do with it and what floats your boat.

i had the jeep the motor was just sitting in the garage floor and some body said you cant well i may be related to tim tayler. i have plans of mudracing mine and im going to give the trails a shot, i have been on a few and so far it does pretty well but i really need to change to an auto i think
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http://www.jeepforum.com/forum/f8/my...oject-1019388/
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Unread 10-17-2011, 12:31 AM   #37
bigmiked2
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Bigblock and big h.p. is nice, and sounds good. But I love the fact that this 302 of mine keeps the front end, and the whole jeep very light. It makes for a very easy and fun jeep to drive on and off rd. I'm going to put a button on it, no joke. Just a light wet spray, mostly to hang the bottle on the rollbar and have something to talk about! I say save the BBs for Broncos and pickum-ups.
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Unread 10-17-2011, 12:51 AM   #38
BagusJeep
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Quote:
Originally Posted by kw89425 View Post
i had the jeep the motor was just sitting in the garage floor and some body said you cant well i may be related to tim tayler. i have plans of mudracing mine and im going to give the trails a shot, i have been on a few and so far it does pretty well but i really need to change to an auto i think
Mud racing is a peculiar sport but I suppose a CJ could conceivably race in Class III Pro stock.
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Unread 10-17-2011, 08:15 AM   #39
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If you want power a 400 small block chevy will make all the power a short wheelbase, high center of gravity vehicle could ever put down. Build cost is about $250 more than a comparable 350ci, which means for somewhere around $2k you can build a 420hp screamer with a 6500 redline and a torque curve that's friendly to towing and 90 octane fuel. They have a reputation for running hot, but that's cause they make power that's close to a big block and power = heat. Basically guys expect a 305 size radiator to work with em just cause 305 valve covers will fit.

I like big blocks alot but they tend to cost nearly a thousand bucks more with all things equal. And I'm not sure the weight penalty is worth the extra power in a jeep. With the 400 sbc aluminum heads & intakes are everywhere cheap and will get that sucker down around the original 6 cylinder's weight, which is great from a wheeling standpoint.

happy swappin
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Unread 10-17-2011, 11:44 AM   #40
kw89425
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you cant find any 400 blocks around here, the dirt racers have destroyed them all, and a bbc is 300 lbs more than a sbc and with aluminium heads the same as a cast headed sbc
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Unread 10-17-2011, 12:28 PM   #41
AFRd_CJ5
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The biggest problem, isn't just that you're adding weight, it's where you're adding weight.
Again, this all depends on what the OP really wants to do with his Jeep.
I street drive, sand drag, and run the sand dunes with mine. When I ran a 427 ci SBC, I was able to put down faster times than another Jeep with a 496 BBC. His Jeep actually weighs less overall than mine does (though not by much). But, he had an iron headed BBC over the front axle, putting a huge weight ratio in the front. That weight distribution problem caused traction problems. Even with more tire, he was a couple tenths slower than my times (and we're talking an easy 100HP difference in motors, his making more).
So it's not just about the overall weight.
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Unread 10-17-2011, 12:48 PM   #42
SleeperCJ
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The generation 4 Chevy LS motors go up to 427 ci on the new corvettes and I think they are squeezing out 600hp plus. I have an LS1 350 ci that is stock with about 325hp but could easily be built to 500hp or more with blowers, etc and it is about 100-150 lbs lighter than the 258.
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Unread 10-17-2011, 01:27 PM   #43
kickingprop
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if you really need that much HP...you could also just put a cheap turbo on a LM7 5.3...Those have been built up to about 600hp.... http://www.hotrod.com/techarticles/e...2/viewall.html

Lots less weight and you'd still have a ridiculous amount of power for a CJ...but the 300hp it puts out stock is more than enough to scare me...
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Unread 10-17-2011, 01:46 PM   #44
Falcon_CMH
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Like I said before in a previous post IMO Chevy, and to more specific a SBC. They are great engines, very affordable, and reasonable to work on.
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Unread 10-17-2011, 04:01 PM   #45
bentring
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Eh, if you're going for being unique, drop in a powerstroke.

(yes I'm kidding... mostly )
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