SR Exlusive Stage 1 Shredder Racing HeadWant to bolt more horsepower onto your small block clone engine? TheShredder head is a high performance sand casting with much better portsthan 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 Stage I head you'll get a 28.5mm stainless steel intakevalve, 24mm stainless steel exhaust valve, both have 5.5mm stems and bothare longer than standard clone valves at 2.590", a compression boosting 16ccchamber, heavy-duty 1.2:1 ratio 0.095" thick stamped steel rocker arms,automotive style retainers with split keepers, and 26lb springs. We have testfitted dual valve springs up to 60lb rates with no fitment issues in the springpocket. This is a killer upgrade for your engine, and if paired with a suitablecam and carburetor you'll see nice power gains.If you are bolting one of these heads on to a non-hemi Predator 212 or otherRato engine you'll need our stepped head dowel pins to adapt the 11mmholes in the block to the 10mm holes in these heads.
Sold in pairs Stepped Head Dowel Pin Set - 10mm to 11mm
SHREDDER STAGE 1 CYLINDER HEAD SPECS Stock Lifan HP212 HeadStock Flow in CFM 80CFM (Apporoximate, depends on flowbench used)
Maximum Horsepower Supported Stock 18HP
RecommendedCam 265 or Dyno CM
Recommended Carburetor Mikuni PE, PZ, or PWK 26mm or larger
Minimum Recommend Bore 68mm
Chamber Volume 16cc (11:1 Stactic 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
Ehaust Valve Total Length 65.15mm
Valve Spring Rate 26LB/IN (19lbs@ .904" and 26lbs at .582" or .319" net valve lift w/ 265cam
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 down dowel pins)
Head Bolt Spacing Pattern Mikuni 48mm
Intake Bolt Size and Thread M6 x 1mm
Exhaust Bolt Pattern Spacing 47mm (like a HF 224)
Exhaust Bolt Size and Thread M8 x 1.25 (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 M6 x 0.50mm / M8 x 1.25mm
Weight (bare casting) 2.342 lbs
Valve Seat Angles Three
Valve Seat Material Steel
Valve Guide Material Steel
