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FS: Mast Black Label LS3 heads and top end

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Old Dec 9, 2025 | 04:15 PM
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Default Mast Black Label LS3 heads and top end

Very nice Mast LS3 top end. Everything is in excellent condition and this setup was all used together (and a proven performer!). Mileage is approximately 4k.

- Mast Black Label LS3 heads, 255cc, 69cc chambers, 4.000" (+) bore
- Stainless valves
- BTR .660" platinum valve springs (new)
- Crower shaft mount rockers w/all hardware ($2300 new)
- Comp Cams 7741 pushrods (used with Johnson 2116 lifters)
- Precision Metalcraft sheet metal intake manifold (newly powder coated)
- Fuel rails w/ new fittings and crossover line
- Custom manifold vacuum lines and fittings
- Polished LS2 throttle body
- Katech aluminum valve covers (newly powder coated) w/-10an breather fittings w/all hardware
- Bosch 2200cc injectors (just cleaned and flow tested)

The intake and valve covers were just powder coated gloss black and absolutely beautiful. The intake is truly a work of art. It's the low rise version that clears the stock hood if used on a C6. There are a couple small marks in the valve covers but nothing bad. The heads are 6-bolt; however, two of the bosses were clearanced for the previous exhaust and these were only used on a 4-bolt block. You can either use as-is, mill the bosses off all together, or weld up the clearanced area if you're using a 6-bolt set up. Also, the valve cover insert says "Lethal Performance". Katech sells new blank inserts for $12 if you'd like to replace them.

New price on this stuff is over $12k.

EDIT (4/19): Since there has been no interest in the entire top and package, I’m pricing the individual components and will separate:

SOLD

Last edited by JShort; Today at 12:51 PM.
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Old Dec 9, 2025 | 04:16 PM
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Removed. Sold

Last edited by JShort; Today at 07:18 PM.
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Old Dec 12, 2025 | 10:33 PM
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To the top
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Old Dec 20, 2025 | 05:56 PM
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nm, sorry

Last edited by grocerygetter; Dec 20, 2025 at 06:16 PM.
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Old Dec 23, 2025 | 07:11 PM
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To the top

Last edited by JShort; Apr 19, 2026 at 09:30 PM.
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Old Apr 15, 2026 | 09:44 PM
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Old Apr 19, 2026 | 09:30 PM
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Since there’s been no interest in the complete top end, I’ve decided to separate with lower prices.


Last edited by JShort; May 2, 2026 at 08:55 AM.
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Old Apr 23, 2026 | 08:59 PM
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Open to offers/trades.
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Old May 2, 2026 | 08:55 AM
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Prices lowered again
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Old May 2, 2026 | 11:29 AM
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Who made the sheet metal intake?
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Old May 3, 2026 | 10:25 PM
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Sale pending
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Old Today | 03:34 PM
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Did I miss the prices
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Old Today | 07:17 PM
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The package has been sold.
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