Callies Godzilla NA High RPM N20 Blower 254 Camshaft: 

• Specs: 254°/264° @ .050", .652"/.652" lift, 116°+6 LSA

• Powerband: 4,500 – 7,500 RPM

• The wide 116° LSA reduces valve overlap, preventing high intake manifold pressure from blowing air/fuel charge straight out the exhaust during high-boost   conditions. 

• Features a large +10° duration split on the exhaust side (264° @ .050") to efficiently clear extreme exhaust gas volume generated under forced induction.

• High duration (.050" / 254°–264°) requires sustained high RPM to fill the combustion chambers efficiently. Low-end torque (below 3,500 RPM) is compromised in exchange for top-end power.

• High-RPM forced induction builds—specifically twin-turbo or large centrifugal supercharger (ProCharger/Vortech) setups pushing high boost levels on the Ford 7.3L Godzilla platform.

• Max-effort, high-RPM naturally aspirated or heavy nitrous oxide builds where the engine can spin past 7,000 RPM (yields ~676 HP N/A on test-bench builds with aftermarket intakes).

• If using an automatic transmission, a high-stall torque converter (3,500–4,000+ RPM stall) is required to stay within the power band. Rear axle gearing should be deepened (e.g., 4.10:1 or numerically higher).

• Aftermarket Connecting Rods and Pistons Strongly Recommended for RPM exceeding 6800.

• Similar to 175-004 which has a narrower LSA.

• Godzilla Engines Require VCT Limiters or Lock-outs on all Performance Camshafts. Available on our Website.

Callies fully finished camshafts are machined and heat treated entirely in house. This continuity of manufacturing allows Callies to deliver high quality camshafts on schedule. Our finished cams are ground with the latest Landis CNC technology. They are ADCOLE and Jenoptik inspected for accuracy, making them the most consistent cams on the market today. If required, your cams can be finished with inverted flank lobe profiles and complex VVT oil channels and drillings.

Callies offers cams to serve a wide variety of applications for many popular engine platforms. Callies cams are available in multiple types of aircraft quality materials. Less aggressive profiles fit nicely within our induction hardened 1050 or 4150 materials. 8620 carburized material works well for many racing applications. Tool steel is available for the most extreme applications. Keeping the valvetrain under control is vital to a successful engine program. Our lobe profiles are designed to produce excellent power without sacrificing durability. They are precision ground in our Landis CNC grinders, with event timing and lobe profile tolerances verified in our Adcole inspection gages. With a long history of superior quality grinding experience, Callies is the right choice for all of your camshaft needs.