Introducing the Sidewinder Big Block Mopar Cylinder Heads. Some Features include: Angle plugs 11/32 stem 2.14 intake/ 1.81 exhaust 84 cc chambers 210 cc intake runner volume 70 cc exhaust runner volume Bronze guides Uses all stock type manifolds, valve covers, rockers, headers and gaskets. We will be offering this head with any “Package” of springs, retainers, and locks that you may require. We offer 10degree titanium retainers, viton seals, and high quality valve jobs. The seats and guides are checked and clearance and sized. We are also proud to offer PORTING SERVICES TO ENHANCE YOUR HEADS! From milling and intake matching, as well as any level of port work.