Denso  U-Groove Hi-Po 340-360-318-273 Spark Plugs Set of eight (8) in OEM factory packages A set of 8 spark plugs for all LA (small block) Mopars. In unopened factory packages.  These are the famous Denso U-groove plugs, favored by Chrysler Engineers, in the hard-to-find 3/8" reach big-block size (WR9FP). Street heat range, replacing N10Y, N11Y, N12Y, N14Y. > Reduces detonation and knocking...> Can actually prevent melted pistons!> Drastically reduces "loading up" and misfiring> Extended plug life> Improves idle and HP output - no misfires! Add S&H per checkout -- several choices -- shipped worldwide. MoPar to ya! Rick Partial list of models and years it fits: Road Runner Barracuda Plymouth Dodge Chrysler Hemi Coronet Challenger Duster Swinger Fury Polara Monaco Newport New Yorker Belvedere Satellite Dart 300 'Cuda 273 318 340 360 Charger Super Bee Valiant GTX R/T 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 Layout, HTML, text & photos © 2000 - 2025 R. Ehrenberg, all rights reserved