Shredder Cylinder Head - For GX200 and Clones - Predator 212/224

Full specs are listed at the bottom of this page.  *FITS ALL ENGINES WITH GX200 AND CLONE HEAD BOLT PATTERN* Want to bolt more horsepower onto your small block clone engine? The Shredder head is a high performance sand casting with much better ports than a stock style die cast clone heads.  The Shredder head flows up to 25% more air than OEM 212/224cc cylinder heads.  With our complete head you'll get a 28.5mm stainless steel intake valve, 24mm stainless steel exhaust valve, both have 5.5mm stems and both are longer than standard clone valves at 2.600", a compression boosting 18cc chamber, heavy-duty 1.2:1 ratio 0.095" thick stamped steel rocker arms, automotive style retainers with split keepers, and 26lb springs. We have test fitted dual valve springs up to 60lb rates with no fitment issues in the spring pocket. This is a killer upgrade for your engine, and if paired with a suitable cam and carburetor you'll see nice power gains.  If you are bolting one of these heads on to a non-hemi Predator 212 or other Rato engine you'll need our stepped head dowel pins to adapt the 11mm holes in the block to the 10mm holes in these heads. Sold in pairs here:Stepped Head Dowel Pin Set - 10mm to 11mm SHREDDER CYLINDER HEAD SPECS Stock Lifan HP212e head Stock Flow in CFM 80CFM (Approximate, depends on flowbench used) Maximum Horsepower Supported Stock 18HP+ Recommended Cam 265 or Dyno CM Recommended Carburetor Mikuni PE, PZ, or PWK 26mm or larger Minimum Recommended Bore 68mm  Chamber Volume 16cc (11:1 Static Compression Ratio on a 212 Predator with piston at zero deck) Valve Material Stainless Steel without hardend tip, use lash caps Intake Runner Volume 30cc Exhaust Runner Volume 23cc Intake Valve Weight 29 grams Intake Valve Head Diameter  28.5mm Intake Valve Stem Diameter  5.5mm Intake Valve Total Length 66mm Exhaust Valve Weight 22.6 grams Exhaust Valve Head Diameter  24mm Exhaust Valve Stem Diameter 5.5mm Exhaust Valve Total Length 65.15mm Valve Spring Rate 26LB/IN (19lbs @ .901" and 62lbs at .582" or .319" net valve lift w/ 265 cam) Valve Spring Retainer Material Steel Valve Spring Retainer Weight 7.8 grams each Valve Spring Keeper Style Automotive Style Split with High Groove Valve Spring Keeper Material Steel Valve Spring Keeper Weight 0.65 grams each Dowel Pin Diameter 10mm (We sell 10mm x 11mm stepped dowel pins) Head Bolt Pattern Standard Small Block Clone Intake Bolt Spacing Pattern Mikuni 48mm Intake Bolt Size and Thread M6x1mm Exhaust Bolt Pattern Spacing 47mm (like a HF 224) Exhaust Bolt Size and Thread M8x1.25 (Standard Clone) Rocker Arms 0.095" thick stamped steel 1.2:1 Ratio Rocker Arm Weight 25.3 grams each Pushrod Guide Plate Standard Small Block Clone Rocker Arm Studs Screw-In Steel M6x0.50mm/M8x1.25mm Weight (bare casting) 2.342lbs Valve Seat Angles Three Valve Seat Material Steel Valve Guide Material Steel