MAP Stage 5 Cylinder Head Preparation (Evo 8/9)
MAP Stage 5 Cylinder Head Preparation
The MAP Stage 5 port & polish features aggressive intake and exhaust work, extensive reshaping and finishing of the combustion chambers, and unshrouding of the valves for improved flow. Proven to 1000+whp in 4g63 applications on both of our in house race cars we feel this is the best performing cylinder head on the market, period.
- Clean / Hot Tank
- Visual Evaluation / Inspection
- Deck Resurface to High Performance RA Specs
- Proprietary MAP 5 Angle Radius Valve Job
- MAP Stage 5 Porting / Polishing
- Final Assembly
- Outbound Shipping
Why Choose MAP Machining Services?
We utilize a Serdi seat and guide machine that provides us with some of the industry's finest valve jobs. We not only cut seats for the non performance market, but have also designed specific cutters that we use in all our modern 4 valve heads. Every head is also vacuum checked after each seat is cut to ensure that no head leaves with a poor sealing valve. We would then typically set and adjust the installed valve tip height to our specs to ensure proper valve train geometry is maintained.
We also have a resurfacing machine that provides a superior RA, or finish, on both cast and aluminum blocks and heads, which is crucial for proper head gasket sealing in modern engines. Ours uses the CBN cutters and provides a superior finish to the older, multi-cutter systems that many shops still use.
Flow Testing Results
We had the head flow tested and the results were impressive! It went from sub 200 CFM on the intake and exhaust side to 250 CFM through the intake and 225+ CFM on the exhaust. Those are impressive gains over stock!
Please note that this product is built to order. Based on fluctuations in demand build times may vary throughout the year. Please contact an MAP sales representative for current estimations.