Retlaw01XJ wrote:If you are using the stock springs, lift should be limited to 0.450" or so. That limits your cam choices.
Looking at Dino's cam spec page again:
http://www.angelfire.com/my/fan/Jeep4.0Camshafts.htm
The stock '96-'04 cam has intake close at 28 degrees (0.050" lift) and valve overlap of 41.6 degrees ( 'advertised'.... be careful here. Manufactures use different specs for 'advertised' specs, so they may not be directly comparable. They may use lifter rise between 0.002" and 0.006". I prefer to go by specs at 0.050" lifter rise, if given... then you're comparing apples to apples.)
Since your goal is to use stock springs, keep the computer happy (not too much overlap), and a late closing intake valve to lower the Dynamic compression ratio, there are only a few choices:
Isky 133125
202/202 duration (@0.050")
0.450" lift
Intake close at 33 deg (0.050")
112 lobe spacing
32 deg overlap (advertised)
505 Performance 263/265-14H
208/212 duration (@0.050")
0.0427"/ 0.438" lift
Intake close @ 38 deg (0.050")
114 deg lobe separation
36 deg overlap (advertised)
Erson E720112
208/214 duration (@0.050")
0.448"/0.0458" lift
Intake close @ 32 deg (0.050")
112 deg lobe separation
60 deg overlap (huh??, doesn't compute!)
I'm liking the 505 cam for you. Plug that into the compression calculator and see if it makes a difference for you.
Trying that cam in a dyno simulation program would be a good way to compare cams as well. If you can get more detailed info from 505 ( a cam card) we could give you a better comparison.
Another member here , TR1Hemi, posted some pics of his heads with opened up chambers, 68 cc. That might be an option for you to lower your compression.
Wow, thanks. This is great info. I agree, I like the 505 cam. Looks like like I have some good options, looks promising.