Crower 74177F Features:

Crower 74177F shaft rocker system for SBC PROMAX 23° cylinder heads, fits 183 cc, 185 cc, 190 cc, 200 cc, and 225 cc runners with 5/8 in. shaft. Rocker geometry includes 1.480 in. arm length, 0.300 in. intake offset, and 0.200 in. exhaust offset for correct valve train alignment. Includes intake stand ID 052F, stand part number 74400X052F, engineered to optimize valve timing and help reduce valve guide wear in racing applications. CNC precision-machined from premium ball race alloy steel, double heat-treated, and micro-finish ground in-house for rigidity, precision, and consistent high-RPM stability.

Shaft Rockers SBC Promax 23° 5/8 Shaft 183cc-225cc Heads Features:

• SBC ProMax 23° head fitment for 183 cc, 185 cc, 190 cc, 200 cc, and 225 cc runners with 5/8 in. shaft system compatibility
• 1.480 in. rocker length with 0.300 in. intake offset and 0.200 in. exhaust offset for corrected valvetrain geometry
• CNC-machined ball race alloy steel construction, double heat-treated and micro-finish ground for rigidity and precision
• Oversized needle bearings, alloy steel tip rollers, and sure-lock rocker nuts for smoother operation and precise adjustment
• Reduced valve guide wear and optimized valve timing with 8740 aircraft-quality steel studs rated at 190,000 PSI tensile strength