Dart IMCA Approved Bare Cast Iron Small Block Fits Chevy Cylinder Head

This head is engraved with IMCA logo and serial numbered to make it approved for use in IMCA classes that allow the CH350I cylinder head
High-velocity 165cc/65cc intake/exhaust runners deliver strong mid-range torque
Assembled versions include 1.94'/1.50' standard length stainless steel valves, performance valve springs, retainers, keepers and 3/8' screw-in studs
SM version (Sport Mod) also has upgraded Comp Cams valve springs and lightweight Ferrea tool steel retainers
SC version (Stock Car) also has upgraded Comp Cams valve springs, lightweight Ferrea tool steel retainers, .080' milled deck w/ corrected intake for max compression

IMCA Approved Stock Replacement Cylinder Heads These Dart IMCA Approved cast iron Small Block Fits Chevy cylinder heads are approved stock replacement heads for Hobby Stock, Northern & Southern Sport Mod, and Stock Car classes (using the 500 carbuertor). We begin with a Dart 10024360 Iron Eagle S/S 165 casting. Each head is engraved and serial-numbered to conform to IMCA rules. After extensive research and development regarding the airflow capabilities and performance characteristics of this cylinder head versus previous models, IMCA approved this Speedway Motors-exclusive cylinder head and it's available for fast shipment in bare or assembled configurations. Featuring precision cast ports and chambers, they have outstanding air flow. Assembled versions have optimized valve sizes for maximum performance within IMCA rules.  (BARE) - Bare Cylinder Head (HS) - IMCA Hobby Stock Heads (SM) - IMCA Sport Mod Heads (Northern and Southern SportMod) (SC) - IMCA Stock Car Heads  (SCBARE) - IMCA Stock Car Bare Cylinder Heads  Complete assembled versions include high-performance springs, 1.94'/1.50' standard length stainless steel valves, 7 degree locks and steel retainers with 3-angle valve jobs.  Sport Mod and Stock Car versions includes high-performance COMP Cams valve springs and handle 0.550' net valve lift, with Ferrea tool steel retainers. Stock Car versions are .080' max flat milled w/ intake surface corrected to max out the compression rule for the IMCA Stock Car. Hobby Stock heads feature Speedway Motors USA-made high performance valve springs 180671515. Approved for IMCA Hobby Stock, Sport Mod and Stock Car classes (using 500 carb) as of 4/27/2020. Assembled heads take approximately 1-2 days for assembly and will be shipped out promptly afterward. Approved for IMCA Hobby Stock, Sport Mod and Stock Car classes (using 500 carb) as of 4/27/2020. Assembled heads take approximately 1-2 days for assembly and will be shipped out promptly afterward.