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| OEM Tech Discussion Forum for OEM (Original Equipment) or stock XJs and MJs. |
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#16
February 1st, 2023, 04:35
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Re: 4.0 Heads in 2023
I'll have to send pictures to emails, unless someone wants to host pictures. I do have one of my head apart. I need to open the Combustion chamber to 60cc. By the FMS the tolerance is 52-58 cc. Both of the heads I did recently from '99 XJ were around 56cc.
Also, I could see using Chevy LS valves, with '95 Melling stock springs, and 4.0L stock retainers and Chevy LS keepers. Keep the lift below .450. 
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#17
February 3rd, 2023, 12:54
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Re: 4.0 Heads in 2023
Can you pm pics? Or I can pm my email
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#18
February 6th, 2023, 04:30
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Re: 4.0 Heads in 2023
Quote:
I did have a bit of a setback on my heads. While CC the heads, I notice that brass valve sleeves were not installed. POed me. Still, need to open up the CC's to 60cc. I did look at the FSM for a 2000. The stock valve springs are rated at 76 ft-lb @ 1.625. Way less than I thought. Not sure what the '95's or HOs are.
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