{"product_id":"manley-11530-1","title":"Manley 11530-1 - Severe Duty Series Chevy Big Block Intake Valve 2 300 In Head Dia 5 325 In O\/A Length","description":"\u003cp\u003eManley 11530-1 - Severe Duty Series Chevy Big Block Intake Valve 2 300 In Head Dia 5 325 In O\/A Length\u003c\/p\u003e\u003cp\u003eIntake Valve - Severe Duty - 2.300 in Head - 0.372 in Valve Stem - 5.325 in Long - Stainless - Big Block Chevy - Each\u003c\/p\u003e\u003cp\u003eManley Valve - Intake, Valve-S\/D 2.300,+100\u003c\/p\u003e\u003cp\u003eManley Severe Duty® Valves deliver the ultimate in strength, reliability, and high-performance durability. Engineered for extreme gasoline engine temperatures, these valves are crafted from exclusive materials (XH-428 for exhaust and NK-844 for intake), offering unmatched tensile strength compared to competitive alloys. In fatigue testing at 40,000 psi and 1400°F, Manley exhaust valves endured 100 million cycles, while competitors failed after just 100,000, proving a 1,000× longer fatigue life. Each valve features chrome stems, hard tips, and swirl-polished underheads with fully machined combustion faces for superior airflow, efficiency, and wear resistance. Built for those who demand race-winning strength and precision, Manley Severe Duty® Valves set the industry standard for performance and endurance.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eProven fatigue strength for extreme performance\u003c\/li\u003e\n\u003cli\u003eChrome stems and hard tips enhance durability\u003c\/li\u003e\n\u003cli\u003eExotic alloys for superior tensile strength, reliability, and longevity\u003c\/li\u003e\n\u003cli\u003eSwirl polishing and machined faces improved airflow\/optimized efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eEngine Type\u003c\/strong\u003e: \u003cspan\u003eICE\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eMake\u003c\/strong\u003e: \u003cspan\u003eChevrolet\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eEngine\u003c\/strong\u003e: \u003cspan\u003eBig Block\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eProduct Market\u003c\/strong\u003e: \u003cspan\u003eDomestic\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eHead Diameter\u003c\/strong\u003e: \u003cspan\u003e2.300\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eValve Head Diameter\u003c\/strong\u003e: \u003cspan\u003e2.300\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eStem Diameter\u003c\/strong\u003e: \u003cspan\u003e0.3720\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eValve Stem Diameter\u003c\/strong\u003e: \u003cspan\u003e0.3720\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eO\/A Length\u003c\/strong\u003e: \u003cspan\u003e5.325\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eValve Length\u003c\/strong\u003e: \u003cspan\u003e5.325\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eValve Tip Length\u003c\/strong\u003e: \u003cspan\u003e0.220\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eTip Length\u003c\/strong\u003e: \u003cspan\u003e0.220\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eMargin Width\u003c\/strong\u003e: \u003cspan\u003e0.065\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eSeat Width\u003c\/strong\u003e: \u003cspan\u003e0.080\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eTop of Head\u003c\/strong\u003e: \u003cspan\u003e7 Degree Dish\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eValve Head Shape\u003c\/strong\u003e: \u003cspan\u003e7 Degree Dish\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eUnderhead Angle\u003c\/strong\u003e: \u003cspan\u003ePro Flo: 12.00\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eUnderhead Radius\u003c\/strong\u003e: \u003cspan\u003e7\/16\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eValve Series\u003c\/strong\u003e: \u003cspan\u003eSevere Duty? 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