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706 heads on 6.0

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Old Mar 20, 2026 | 08:48 AM
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Default 706 heads on 6.0

I’m rebuilding an LY6 short block for my crew cab. Looking for a torquey motor with clean idle. Running a 206/218 .555 117+5 cam.

if it worth sending the heads off to TPS to make them PRC 2.5 heads? They will deshroud the valves and add larger ones. They flow much better .400-.600 lift. Just trying to justify getting a basic rebuild or going all out on what’s the best route for my build.
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Old Mar 20, 2026 | 10:21 AM
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Good flowing heads will always benefit power and efficiency. Since you already have them, having them ported will get a lot of benefit vs the cost of new/aftermarket castings.
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Old Mar 20, 2026 | 10:56 PM
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With those cam specs, you could just run them as-is and make great torque.

Porting and larger valves will make more power at 4K+ rpm; don't know how much time you will be spending there.

For the record, I'm planning to build a 6.0 with 862 heads in the near future.
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Old Mar 20, 2026 | 11:20 PM
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Not just the flow, but the small chamber should get you some more compression which will help with the torque.
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Old Mar 21, 2026 | 10:59 AM
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That's Richard Holdener's favorite stock LS head.
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Old Apr 2, 2026 | 01:37 PM
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I agree. Keep the heads stock. Maybe a valve job at most.

It’s a torque motor. No need to port the heads you want small ports.
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