Shredder Cylinder Head - STAGE 1 - For GX200 and Clones - Predator - Wildcat - Ducar

Full specs are listed at the bottom of this page. 

**FITS ALL ENGINES WITH GX200 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 stock style die cast clone heads.  The Stage 1 Shredder head flows 90CFM on our flow bench, which is 35% more air than OEM 212/224cc cylinder heads. This head can be purchased as a bare casting or a completed head ready to bolt onto your 10mm or 11mm dowel block. 

With our bare or complete Stage 1 head you'll get a ported Shredder casting that has been flowed on our bench to guarantee 10% horsepower gains above a standard Shredder. With a complete Stage 1 Shredder you'll also get a 28.5mm stainless steel intake valve, 24mm stainless steel exhaust valve, both have 5.5mm stems, 13cc, 15.5cc, or 18cc chamber, 1.2:1 ratio heavy-duty stamped 0.095" thick steel rocker arms, titanium retainers with medium groove split keepers, 60lb dual springs setup to have 34lbs seat pressure, and a laser cut steel guide plate. 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 308 or larger cam and a 28mm or larger carburetor you'll see 20+hp. 

If you are bolting one of these heads on any non-hemi Predator 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