for Ø 82.5 - 86 mm Piston & Cylinders

JPS Aircooled 356 - 912 CNC Billet Cylinder are a exact remanufacturing of the SC-912 Cylinderheads.

They are manufactured according to the factory drawings, with a lot of improvements over the old cast Cylinderheads that are now more than 50 years old.

• manufactured on modern 5-Axis milling machines makes this head to a Class of his own
• 12 mm long spark plug threat
• valves guide support
• digitization of the SC and 912 combustion chambers 
• perfect Intake an exhaust canals
• 8mm steam valves
• 40mm intake / 35mm exhaust
• single valve springs in top quality  

Available options:

• Twin spark 
• Double valve springs  

for Ø 91/93/94mm Piston & Cylinders

The JPS Aircooled high performance "Sport Plus " Cylinderhead for 91, 93 and 94mm P&C, is a new developed.

This CNC billet heads are flow bench tested with a lot of improvements and outperform any stock Cylinderhead by far.

If you looking for the next level of your 356 - 912 this heads are the solution for that.

• flow bench optimized intake and exhaust canal
• flow bench developed combustion chamber
• prepared for 42/35mm or 44/35mm valves for maximum torque and high performance.  

 Complete manufactured and black anodized.

Available options:

• Twin spark
• Double valve springs (93/94mmStandard)

JPS Aircooled billet manifold for Weber 48 IDA

• perfect shape,
• flow bench tested

This kit includes:

• 1 Oil sump with ring magnet complete assembled (all screws are tigthend to the correct torque and secured)
• 1 Oil tube extension
• 1 Drain plug
• 10 self-locking nuts M6
• 10 cooper ring for M6 nuts  
•  black anodized 

• CroMo flywheel CNC machined 
• weight 3.3kg / 7.28 lbs
• available for 12V and 6V starter
• for 200mm kennedy clutch 
• stress and static calculated 
• race proven

• made of highest quality aluminium precision tubes 
• correct heat treatment
• you can run all available camshafts
• pushrods can handle up to 200kg / 440lbs valve spring pressure
• racing proven over years up to 8k rpms
• ligther than stock pushrods
• available in every length on request

• available as kit or in parts too
• long rockershaft
• short rockershaft
• sleeve 
• clamp washer
• all parts are 100% CNC maschined an fits perfect
• shaft are carbon nitride and centreless grinded too factory specs

• hardened 54 HRC and grinded (Pos.12)
• CNC manufactured

• hardened 54 HRC and grinded (Pos.12)
• CNC manufactured

CNC manufactured

CNC manufactured

CNC laser cutting precision copper exhaust gasket