VTI Engine Package – 1300 Nord – Full Conversion up to +45 BHP

Description

This rebuild and tuning kit is engineered to elevate the Alfa Romeo 1300 engine to a new level of performance. By combining increased bore, optimized compression ratio, the kit delivers measurable gains in torque, drivability, and high-RPM horsepower. It is designed for demanding applications, including fast road use, track days, and competition builds.

Engineering Basis

• Bore options: 74.5 mm (1,303 cc) or 75.5 mm (1,343 cc).
• Stroke: 75 mm standard; supplied long-stroke crankshaft increases displacement and torque further on demand.
• Compression ratio: 10.0–11.5:1, depending on specification, improving thermal efficiency and mid-range response.
• Geometry: Conversion from undersquare (stock 74 × 75 mm) to oversquare (75.5 × 75 mm) enables higher RPM operation and improved valve breathing.
• RPM capability: ~7,800 rpm for fast-road/track applications; up to ~7,900–8,300 rpm in fully developed race builds with balanced bottom end and reinforced valve train.

Key Performance Features

• Rated at 110–125 hp in fast-road specification (bore increase, compression upgrade, sport cams, carburetors, headers).
• Up to 140–150 hp achievable in full race specification (long-stroke crankshaft, high compression, competition cams, 45–48 DCOE carburetors, head work, and tuned exhaust).
• Contact us for high-performance job on head.
• Stronger torque delivery across the rev range, with improved mid-range drivability.
• Peak power delivery at ~7,000–7,500 rpm, with extended top-end capability in race trim.
• Suitable for aggressive street builds, circuit racing, and track-day applications.

Kit Highlights

• Forged pistons and liners available in 74.5 mm and 75.5 mm diameters, supporting compression ratio increase and oversquare conversion.
• Engineered for seamless integration with aftermarket stainless-steel sports exhaust systems.
• Stainless-steel 4-2-1 headers are strongly recommended, providing up to +10 hp through improved exhaust scavenging and top-end breathing.

Important Notes

• High-capacity oil pumps are not included. The existing lubrication system must be verified to sustain high-performance operation.
• All crankshafts and pistons are machined from new. Lead times may exceed 4 weeks.
• Installation and tuning should be performed by qualified engine builders to ensure reliability under high load and high RPM operation.

Kit Content:

• Forged pistons with conventional rings, standard pins, and wire locks.
• Precision-engineered liners.
• Reinz head gasket and full engine gasket set.
• Standard rod and main bearings (oversize options available).
• IWIS race/road timing chains (top and bottom).
• Thrust washers, lock tabs, and complete hardware kit.
• Camshafts
• Intake and Exhaust Valves
• Valves Guides
• Valves Springs
• Timing Pulley
• Full Gasket Kit
• Carburettors Mounting
• Sport Sparks
• Sport Flywheel
• Sport Horns
• Valves Seals

Summary

This kit represents a comprehensive solution for extracting significantly more performance from the Alfa Romeo 1300 engine. With bore enlargement, compression increase, and the option of a long-stroke crankshaft, the engine can be developed from its original ~90 hp output into a 110–125 hp fast-road specification or a 140–150 hp high-revving competition unit. When paired with stainless-steel headers and proper tuning, the engine delivers strong torque, sharper throttle response, and extended power at high rpm, making it highly competitive both on road and circuit.

Excellent — here is a comprehensive comparison chart covering the 1300, 1600, 1750, and 2000 Alfa Romeo Twin Cam engines, with all bore options, displacements, compression ratio ranges, expected horsepower, rpm ceilings, and notes on geometry. This will let your customers compare upgrade paths at a glance.