Rei Amami Ambition Fedv 343 Top May 2026

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Authenticity is an issue. Rei Amami produces only 50 FEDV 343 Top units per calendar year. Each unit is hand-ported, flow-bench tested, and signed by Amami himself on the underside of the valve cover. rei amami ambition fedv 343 top

Estimated Price: $8,500 to $12,000 USD for the complete top end. Search volume for this specific string appears to

If you find one on eBay for $3,000, it is a counterfeit. Fake Amami parts have clogged the market; they use inferior Chinese titanium and have a 100% failure rate under load. Estimated Price: $8,500 to $12,000 USD for the

Installing a Rei Amami Ambition FEDV 343 Top on a suitable short block yields quantifiable results. Testing was performed by RevSpeed Magazine on a Hub-Dyno with a Garrett G42-1200 turbocharger at 38 PSI.

| Metric | Stock 4G63 Head | FEDV 343 Top | Delta | | :--- | :--- | :--- | :--- | | Peak Horsepower | 450 whp | 847 whp | +397 whp | | Peak Torque (ft-lbs) | 380 @ 6k | 602 @ 7.8k | +222 ft-lbs | | Redline (safe) | 8,200 RPM | 11,000 RPM | +2,800 RPM | | Airflow (CFM @ 28" H2O) | 275 cfm | 398 cfm | +123 cfm | | Weight (complete top end) | 52 lbs | 41 lbs | -11 lbs |

The most impressive figure is the power delivery. Unlike standard top ends that collapse after peak torque, the Ambition FEDV 343 holds 95% of peak horsepower from 8,000 RPM to 10,500 RPM. That is an operational bandwidth of 2,500 RPM at maximum effort—ideal for road racing where shifting costs time.