JUN AUTO CAMSHAFT KIT FOR TOYOTA 2JZ-GTE 1033M-T006

 

JUN AUTO CAMSHAFT KIT FOR TOYOTA 2JZ-GTE 1033M-T006

The JUN AUTO Camshaft Kit for Toyota 2JZ-GTE 1033M-T006 is a hardcore Japanese valvetrain package.

It was designed for high-RPM, high-boost 2JZ builds — especially drag, top speed, and circuit Supra projects pushing well beyond stock turbo limits.

What makes the JUN 1033M-T006 special?

The 1033M-T006 is not just “cams only.” It is a complete valvetrain philosophy from  JUN AUTO aimed at eliminating valve float and shim failure at very high RPM. The kit includes:

• Intake cam: 272° duration / 10.8 mm lift
• Exhaust cam: 272° duration / 10.8 mm lift
• Uprated valve springs
• Type 2 retainers
• “Inner Shim R” conversion system (shim-under-bucket style)  

Why the “Inner Shim R” matters

Toyota factory 2JZ heads use shim-over-bucket design on early engines. At extreme RPM:

• the shim can jump out,
• valve float can occur,
• and catastrophic engine damage becomes possible.

JUN converts the setup into shim-under-bucket:

• safer above 8500 RPM,
• more stable valve control,
• better for anti-lag, huge boost, and sustained racing abuse.

This is why JUN is respected in old-school Japanese tuning circles alongside brands like  HKS and  TOMEI Powered.

Technical Character 

JUN philosophy

JUN cams prioritize:

• maximum airflow at high RPM,
• aggressive overlap,
• turbo efficiency at large turbine flow rates,
• race durability.

Result:

• weaker idle quality,
• reduced low-end response,
• explosive top-end power.

This is the type of cam profile used in:

• 800–1400 hp Supras,
• drag 2JZs,
• standing-mile builds,
• old Option Video / Top Secret style monsters.

Comparison with HKS and Tomei

HKS cams are smoother and more OEM-refined. They:

• spool turbos earlier,
• idle cleaner,
• work beautifully for street Supras,
• retain strong midrange torque.

Best for:

• 500–800 hp builds,
• responsive street cars,
• twin-turbo street tuning.

Tomei sits between HKS and JUN:

• more aggressive than HKS,
• more streetable than JUN,
• famous for quick turbo response.

Excellent for:

• drift builds,
• responsive single turbo setups,
• track-day cars.

Attribute	JUN AUTO Camshaft Kit for Toyota 2JZ-GTE 1033M-T006	HKS 2JZ-GTE 264 Intake Cam	Tomei Procam/Poncam 2JZ-GTE Set
Philosophy	Full race	Street-track balance	Aggressive street/track
Duration	272°	264°	260- 270°
Lift	10.8 mm	Lower/moderate	Moderate-high
Idle Quality	Rough	Smooth	Moderate
Turbo Spool	Later	Earlier	Fast
High RPM Stability	Extremely high	Good	Very good
Best RPM Range	5000- 9500+	3000- 8000	3500- 8500
Best Use	Drag/top speed	Street Supra	Drift/track
Valve Train Included	Yes	Usually cams only	Usually cams only
Inner Shim Conversion	Yes	No	No

 Real-world behavior

JUN 272/10.8 cams feel like:

• calm below 4000 rpm,
• suddenly violent after boost threshold,
• massive top-end pull,
• “monster Supra” personality.

They are ideal with:

• large single turbo,
• built bottom end,
• aftermarket ECU,
• ported head,
• upgraded fuel system.

Without supporting mods, they can actually make the car slower at low RPM.

Advantages of JUN over others

1. Complete engineering package
   Not just cams — entire valve control system.
2. Better for extreme RPM
   Shim-under-bucket is safer for racing.
3. Massive airflow potential
   10.8 mm lift is very serious territory.
4. Legendary Japanese motorsport pedigree
   JUN has history in:

• JGTC,
• drag racing,
• Bonneville speed projects.

Weaknesses

• Expensive
• Requires professional tuning
• Rough idle
• Reduced street comfort
• Overkill for mild builds
• Not ideal for stock twins

Conclusion

If:

• HKS = samurai precision,
• Tomei = street warrior,
• JUN = katana forged for war.

The JUN 1033M-T006 is for builders chasing:

• maximum airflow,
• ultra-high RPM reliability,
• and brutal top-end dominance.

For a 600 hp street Supra, HKS or Tomei is usually smarter.

For an 850–1400 hp full-send 2JZ monster, JUN becomes one of the most serious Japanese valvetrain systems ever made.  

JUN AUTO CAMSHAFT KIT FOR TOYOTA 2JZ-GTE 1033M-T006