Edelbrock Cyl Head Perf RPM AMC 290 304 343 360 390 401 V-8 w/ Mach Exhst X-Over Complete 2009-pontiac-g8-esi4579119 Most kits require no modifications

Most kits require no modifications for installation

1984-1988 Mercury Cougar XR-7 1975-1986 Mercury Grand Marquis Base 1979-1986 Mercury Grand Marquis Colony Park 1987-2008 Mercury Grand Marquis GS 2005 Mercury Grand Marquis GSL 2005 Mercury Grand Marquis Limited Edition 1983-2011 Mercury Grand Marquis LS 2003 Mercury Grand Marquis LSE 2005 Mercury Grand Marquis Ultimate Edition 2003-2004 Mercury Marauder Base 1997-2004

1983-1986 Ford F-250 Base 1975-1982 Ford F-250 Custom 1975-1978 Ford F-250 Northland 1975-1981 Ford F-250 Ranger 1978-1981 Ford F-250 Ranger Lariat 1975-1981 Ford F-250 Ranger XLT 1982-1986 Ford F-250 XL 1982-1983 Ford F-250 XLS 1977

1999-2000 Chevrolet C2500 Base 1996-1998 Chevrolet C2500 Cheyenne 1999-2000 Chevrolet C2500 LS 1996-1998 Chevrolet C2500 Silverado 1998 Chevrolet C2500 WT 1996-1999 Chevrolet C2500 Suburban Base 1996-1999 Chevrolet C2500 Suburban LS 1996-1997 Chevrolet C2500 Suburban LT 1996-1997

They are smooth idling cams for daily drivers

Edelbrock Cyl Head Perf RPM AMC 290 304 343 360 390 401 V-8 w/ Mach Exhst X-Over Complete 2009-pontiac-g8-esi4579119 Most kits require no modificationsThe Edelbrock #60139 Performer RPM cylinder head is designed as a bolt on performance upgrade for any 1967 91 AMX, Javelin or Jeep with a 343, 360, 390 or 401 AMC V8 engine. They include adjustable rocker studs and guide plates set up for use with small block Ford style adjustable 1. 6: 1 ratio rockers. The intake flange is dual drilled to accommodate early and late model intake bolt patterns, covering 1967 91. A Complete head includes larger than