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Old 11-20-2018, 07:57 AM   #1 (permalink)
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Cam Selection for 258 w/ 4.0 head

Hi All,
I'm doing some work on my YJ's motor over the winter and wanted to get some advice on camshaft selection. My YJ doesn't see a lot of trail use so I'm not necessarily looking for only low-end torque, more of a strong midrange/top-end and good sound.

My setup is:
  • '89 258 shortblock (all stock)
  • 0630 cylinder head
  • Weber 34/34 DGEC carb, electric fuel pump
  • MSD 6AL/Blaster coil
  • Stock dist w/ Ford cap upgrade
  • TF999 3-speed auto
  • 8.8 rear with LSD and 4.10s
  • 33x12.50 tires

I have a Holley 4412 on the shelf that I might use instead of the Weber, and I'd probably get a better intake if I went that route. I'm still planning on running a catalytic so I have a good used unit from a C6 corvette that should allow more than enough exhaust flow. I'm looking into stepping up the rest of the exhaust to 2.5", and also thinking about changing the gears to 3.73 to improve highway cruising a bit.

So, for the camshaft I've been looking at some budget friendly options like the ENGINETECH ES1122R from RockAuto, up to some more performance-oriented options like the Lunati 10680702.

I worry about the gross lift on the Lunati because it might not work with the stock 0630 valvesprings, and I'd prefer to get a complete kit if that's the case. Because my motor is an 89 and uses the 97 head, it's looking like I'd need a kit for a 4.0 to accommodate the updated valve stem diameters.

Any tips on what will work for my application?

PS. I'm not here to discuss the merits of carb/efi, or 4.0/4.2. I like my carbed 4.2 a lot, I'm just trying to give it a bit more power.
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"Douglas" the YJ: 258 w/ 4.0 head, Holley 4412, MSD, 8.8

Last edited by jcdj1996; 11-20-2018 at 07:59 AM.
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Old 11-26-2018, 07:32 PM   #2 (permalink)
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Old 01-22-2019, 07:04 PM   #3 (permalink)
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I ran a crane 753901 in my 4.6 stroker, use a good high zinc oil when breaking in the cam. I had the same cam in a 258 with a 4.0 head, ran good, good idle and plenty of torque. Tim
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Old 01-29-2019, 10:14 PM   #4 (permalink)
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Agree that lunati cam is too much for stock springs. Either run the one above ^^ or upgrade springs.

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Old 01-29-2019, 11:56 PM   #5 (permalink)
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If you want to upgrade the head, you can use 5.7 hemi valves, dont try to use some small block chevy valves, it will cost you about $500 for springs, retainers and locks....the hemi valves are the correct length and only require an oversize of the seats, bowl blend and use stock springs and retainers. Tim
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