I need to get more power out of my 258 inline 6.  When exploring options for this I found (cliffordperformance.net) out of Wildomar CA.  They seem to have some great products to get real power from those nornally weak jeep sixes.  I just never heard, or seen them mentioned in blogs, magazines, on the trail or sponsered an event.  I would like to here some feedback or references before investing in their products. thanks  

my old boss bought an 05 rubicon, and we installed a supercharger and an airraid intake, and a new exhaust system. he took it to mexico and raced a jeep with a 350 chevy down the beach. sure he won, but it destroyed the motor at 9000 miles. we then put a hemi out of a 05 ram, along with a k&n intake and another exhaust system. it has more power than one could want and is super reliable. it did cost a small fortune. my dad pulled the whole harness apart and ohmed the harness to put the ram and jeep together. on the second hemi rubicon swap we  did, they purchased a harness, but it lacked some functions that we included in the harness we did.  

ccjeep:
I need to get more power out of my 258 inline 6.  When exploring options for this I found (cliffordperformance.net) out of Wildomar CA.  They seem to have some great products to get real power from those nornally weak jeep sixes.  I just never heard, or seen them mentioned in blogs, magazines, on the trail or sponsered an event.  I would like to here some feedback or references before investing in their products. thanks

Most of the time people looking for more power from engine mods is 4x4 should be instead looking for new deeper axle gears. Even a standard engine can do well if it is geared properly for load. Many never bother to regear though and think engine is the solution. But with engine mods or changes comes increased cooling needs and increase strain on drive train and issues can develop there.  

Regear it with some deeper gears, I wouldn't even touch the motor unless it's just tired and needs a rebuild.  

I had a old cj7 with the 4.2 in it. went it blew i had a new one built instead of putting a v8 in it. we took a 4.2 block and a 4.0 head (used one from a 1997). had to block off a couple of waterways and some other small machined areas but nothing major. bored the block .010, just to clean it up, bumped the compression to 9 to 1. put on a clifford intake and pacesettet header, nice flowing exhaust. holley 600 carb. upgraded the ignition system. end results were 260 hp and 300 ftlb of torque. it was a mild build, can easily get 300+hp out of this setup if you bore to .030 and up the compression to around 10 to 1. it was a daily driver and a weekend warrior. ran great and had plenty of power to move my CJ on 35s and 3.73 gears. clifford makes some good stuff. good quality and the prices are reasonable.  

You have low standards of performance if you think the 3.73 gears with 35's is a great combo. It has to be a bit of a slug in top gears and I'll bet you wind it out a lot in lower gears to get some performance. SO sad because if you through in some 4.56 it would run really well.  

you sound like a typical jeeper. i wasn't after performance, just reliability. with that combo i had, no complaints. i had good power on the road and in low range, good offroading. oh yeah. i hate rocks so that wasn't my thing, i didn't need lower gears. i like mud, hills, trails, that sort of thing. crawling around isn't for me.  

Reliability comes with reducing driveline torque loading. Low range is not a replacement for proper axle gears. If geared properly, you will not realy need low rang most of the time off road unless in maybe sand or trying to crawl. If it is pretty much a must have (low range) your are geared way to tall. BTW, then there is the extra counter torque that engine mounts and frame have to control from Tcase in low range overcoming tall effective ratio but many never consider this. You do not have to be a "Jeeper" to appreciate the value of proper gearing.  

"proper gearing" is all relative to what your trying to accomplish. and instead of staying on topic with the question that was asked you have to bad mouth my choice of gears. it wasn't your jeep so don't worry about how was built or ran. its no wonder someone on this forum made a snowmansucks name after you.

back to the topic. Clifford makes good products and i've had good results with them.  

Your mistake is classic. You have the wrong axle ratio for tires size and engine and justify it by running low range a lot giving no thought to the strain on drive train or chassis. Like it is immune to it. And the real silly part about this is that you have if you have a OD tranny that even with 4.56's and 35's you are only turning about 2200 RPM at 65 which is a little low fpr drag from lift, load and engine but a far better match than 3.73's. This all started because someone was looking for more power because of lift and tires when answer was not a 300 HP 6 (which would have less torque at lower RPM's unless supercharged and then it would is super charged you would have cooling issues, need 93 octane and then tranny drive line torque issues.) It never fail to amaze me that the lengths and expense many will go through to try to avoid or justify tall gears when if there is a silver bullet for 4x4 power needs with lifts, it is proper, deeper axle gears. Not magic air cleaners, tunes or exhausts. Regearing is a win win scenario.