Melling MRM-1786

Rocker arm nut Melling MRM-1786 for Chevrolet, GMC, Pontiac, Oldsmobile and other engines, 1955–2002. Open-hex rocker arm nut, 3/8"-24 UNF thread – for many classic AMC, GM and Ford engines with stud-mounted rockers.

• Typeopen hex nut
• Thread3/8"-24 UNF
• Thickness0.500" (12.7 mm)
• Sold as1 piece

Fits

• Chevrolet – 140 (2.3 L) H6: 1960–61 · 145 (2.4 L) H6: 1961–63 · 153 (2.5 L) L4: 1962–70 · 164 (2.7 L) H6: 1964–69 · 194 (3.2 L) L6: 1962–67 · 200 (3.3 L) V6: 1978–79 · 229 (3.8 L) V6: 1980–84 · 230 (3.8 L) L6: 1963–70 · 231 (3.8 L) V6: 1980–81 · 250 (4.1 L) L6: 1966–84 · 262 (4.3 L) V8: 1975–76 · 262 (4.3 L) V6: 1985–99 · 265 (4.3 L) V8: 1955–57, 1994–96 · 267 (4.4 L) V8: 1979–82 · 283 (4.6 L) V8: 1957–67 · 292 (4.8 L) L6: 1963–89 · 302 (4.9 L) V8: 1967–69 · 305 (5.0 L) V8: 1976–2002 · 307 (5.0 L) V8: 1968–73 · 327 (5.3 L) V8: 1962–69 · 327 (5.4 L) V8: 1964–69 · 350 (5.7 L) V8: 1967–2002 · 400 (6.6 L) V8: 1971–80 · 402 (6.6 L) V8: 1970–72
• GMC – 153 (2.5 L) L4: 1963–65 · 194 (3.2 L) L6: 1963–66 · 200 (3.3 L) V6: 1978–79 · 229 (3.8 L) V6: 1980–84 · 230 (3.8 L) L6: 1963–69 · 250 (4.1 L) L6: 1966–84 · 262 (4.3 L) V6: 1985–99 · 267 (4.4 L) V8: 1979–82 · 283 (4.6 L) V8: 1960–67 · 292 (4.8 L) L6: 1963–89 · 305 (5.0 L) V8: 1976–2002 · 307 (5.0 L) V8: 1968–73 · 327 (5.3 L) V8: 1967–68 · 327 (5.4 L) V8: 1967–68 · 350 (5.7 L) V8: 1969–2002 · 400 (6.6 L) V8: 1971–72, 1974–80 · 402 (6.6 L) V8: 1971–72, 1974
• Pontiac – 215 (3.5 L) L6: 1964–65 · 229 (3.8 L) V6: 1980–81 · 250 (4.1 L) L6: 1970–76 · 262 (4.3 L) V6: 1985–87 · 267 (4.4 L) V8: 1979–82 · 305 (5.0 L) V8: 1976–92 · 307 (5.0 L) V8: 1968–73 · 350 (5.7 L) V8: 1977–79, 1987–97 · 350 (5.7 L) V8 (Chevrolet): 1977–79 · 350 (5.7 L) V8 (Pontiac): 1977
• Oldsmobile – 250 (4.1 L) L6: 1966–71, 1973–76 · 262 (4.3 L) V6: 1991–94, 1996–99 · 267 (4.4 L) V8: 1981–82 · 305 (5.0 L) V8: 1977–80, 1982–87, 1991–92 · 350 (5.7 L) V8: 1977–79, 1992 · 350 (5.7 L) V8 (Chevrolet): 1977–79 · 350 (5.7 L) V8 (Oldsmobile): 1977–79
• Buick – 250 (4.1 L) L6: 1968–71, 1973–75 · 267 (4.4 L) V8: 1981–82 · 305 (5.0 L) V8: 1977–87, 1991 · 350 (5.7 L) V8: 1977–79, 1992–96 · 350 (5.7 L) V8 (Chevrolet): 1977–79 · 350 (5.7 L) V8 (Buick): 1978–79
• Ford – 221 (3.6 L) V8: 1962–63 · 240 (3.9 L) L6: 1965–74 · 260 (4.3 L) V8: 1962–65 · 289 (4.7 L) V8: 1963–69 · 302 (5.0 L) V8: 1968–69
• AMC – 290 (4.7 L) V8: 1967–69 · 304 (5.0 L) V8: 1970–73 · 343 (5.6 L) V8: 1967–69 · 360 (5.9 L) V8: 1970–73 · 390 (6.4 L) V8: 1968–70 · 401 (6.6 L) V8: 1971–73
• Mercury – 221 (3.6 L) V8: 1962–63 · 260 (4.3 L) V8: 1962–65 · 289 (4.7 L) V8: 1963–68 · 302 (5.0 L) V8: 1968–69
• Cadillac – 305 (5.0 L) V8: 1991–92 · 350 (5.7 L) V8: 1990–96
• Rambler – 290 (4.7 L) V8: 1966–69 · 343 (5.6 L) V8: 1967–69 · 390 (6.4 L) V8: 1969
• International – 240 (3.9 L) L6: 1965–70
• Jeep – 304 (5.0 L) V8: 1972–73 · 360 (5.9 L) V8: 1971–73
• Studebaker – 194 (3.2 L) L6: 1965–66 · 230 (3.8 L) L6: 1966

Manufacturer part number: Melling MRM-1786.