my chat with comp Cams rep

[jeepsluvmud]

hey guys
so im building a stroker for my cherokee. I want a cam that sounds like i have a cam in the engines lol the rep from comp cams says i can run a 68-239-4 but i would lose to much vaccum. How can i fix this so i can run this cam here is my recipe is going in a 89 4.0L

Jeep 4.2L 3.895" stroke crank
Jeep 4.0L 6.125" rods
Keith Black UEM-IC944-030 pistons
9.6:1 CR
CompCams 68-231-4 206/214 degree camshaft
Ported HO 1.91"/1.50" cylinder head
Mill block deck 0.020"
Mopar/Victor 0.043" head gasket
0.050" quench height
Ford 24lb/hr injectors with adjustable FPR or MAP adjuster for '87-'95 engines, Ford 24lb/hr injectors for '96-'04 engines, '99-'00 Chevy LS1 26.2lb/hr injectors for '05-'06 engines
264hp @ 4900rpm, 324lbft @ 3500rpm

[Cheromaniac]

I want a cam that sounds like i have a cam in the engines lol the rep from comp cams says i can run a 68-239-4 but i would lose to much vaccum.

Use the 68-231-4 cam instead unless you're planning to run your engine at high rpm for extended periods.
The MAP sensor-based speed density fuel management system in our Jeeps doesn't like big cams and the low vacuum will cause very poor idle quality.
If you're intent on using the 68-239-4 cam anyway, I suggest you contact FlyinRyan who can reprogram your ECU to cope with the bigger cam.

[FlyinRyan]

No OBD1 support.....Sorry.

[SilverXJ]

christuned does obd I work