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Home » Mitsubishi Evo 4-9 » Engine Internals UPPER
This is a comprehensive kit that INCLUDES;
ND double valve spring set
Ti retainer set
Small valve stem seal set
This wide coil allows spring valve lifts as high as 12mm to be utilised without the fear of damaging coil bind or loss of valve control. We have run these springs over 10,000rpm, 1300Hp and 60Psi boost!
NOTE:- When using these springs the little shelf on the cylinder head needs extra clearance. We do this with a die grinder. See picture 2 for info by clicking above.
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Evo 9 SWB is competing in the UK Time Attack series for 2019, Keep
an eye on our social media for updates and the Norris Designs
YouTube channel for in car videos.
Version 3 supercharger kits proving themselves out there all around
the world! Zero lag!
Version 4 dry sump kits in stock and ready to ship. Featuring the
SUPERB Auto Verdi oil pump.
Colt Ralliart is competing th CCRC Saloons Championship again in
2019. Going great so far!
Designs are the UK agent for Bullet engine blocks. We stock 4G63
& 4G64 versions. As used in our Evo 9 SWB demo car.