Proform Distributor Shaft Spring - 66948C ⚠ Check if this part fits your vehicle Select your vehicle to confirm fitment before you buy. Select vehicle HEI Adv. Curve Kit Manufacturer: Proform $7.69 Qty: Add to cart Ship to Select country United States of America Afghanistan Åland Islands Albania Algeria American Samoa Andorra Angola Anguilla Antarctica Antigua and Barbuda Argentina Armenia Aruba Australia Austria Azerbaijan Bahamas Bahrain Bangladesh Barbados Belarus Belgium Belize Benin Bermuda Bhutan Bolivia (Plurinational State of) Bonaire, Sint Eustatius and Saba Bosnia and Herzegovina Botswana Bouvet Island Brazil British Indian Ocean Territory Brunei Darussalam Bulgaria Burkina Faso Burundi Cabo Verde Cambodia Cameroon Canada Cayman Islands Central African Republic Chad Chile China Christmas Island Cocos (Keeling) Islands Colombia Comoros Congo Congo (Democratic Republic of the) Cook Islands Costa Rica Côte d'Ivoire Croatia Cuba Curaçao Cyprus Czechia Denmark Djibouti Dominica Dominican Republic Ecuador Egypt El Salvador Equatorial Guinea Eritrea Estonia Eswatini Ethiopia Falkland Islands (Malvinas) Faroe Islands Fiji Finland France French Guiana French Polynesia French Southern Territories Gabon Gambia Georgia Germany Ghana Gibraltar Greece Greenland Grenada Guadeloupe Guam Guatemala Guernsey Guinea Guinea-Bissau Guyana Haiti Heard Island and McDonald Islands Holy See Honduras Hong Kong Hungary Iceland India Indonesia Iran (Islamic Republic of) Iraq Ireland Isle of Man Israel Italy Jamaica Japan Jersey Jordan Kazakhstan Kenya Kiribati Korea (Democratic People's Republic of) Korea (Republic of) Kuwait Kyrgyzstan Lao People's Democratic Republic Latvia Lebanon Lesotho Liberia Libya Liechtenstein Lithuania Luxembourg Macao Madagascar Malawi Malaysia Maldives Mali Malta Marshall Islands Martinique Mauritania Mauritius Mayotte Mexico Micronesia (Federated States of) Moldova (Republic of) Monaco Mongolia Montenegro Montserrat Morocco Mozambique Myanmar Namibia Nauru Nepal Netherlands New Caledonia New Zealand Nicaragua Niger Nigeria Niue Norfolk Island North Macedonia Northern Mariana Islands Norway Oman Pakistan Palau Palestine, State of Panama Papua New Guinea Paraguay Peru Philippines Pitcairn Poland Portugal Puerto Rico Qatar Réunion Romania Russian Federation Rwanda Saint Barthélemy Saint Helena, Ascension and Tristan da Cunha Saint Kitts and Nevis Saint Lucia Saint Martin (French part) Saint Pierre and Miquelon Saint Vincent and the Grenadines Samoa San Marino Sao Tome and Principe Saudi Arabia Senegal Serbia Seychelles Sierra Leone Singapore Sint Maarten (Dutch part) Slovakia Slovenia Solomon Islands Somalia South Africa South Georgia and the South Sandwich Islands South Sudan Spain Sri Lanka Sudan Suriname Svalbard and Jan Mayen Sweden Switzerland Syrian Arab Republic Taiwan, Province of China Tajikistan Tanzania, United Republic of Thailand Timor-Leste Togo Tokelau Tonga Trinidad and Tobago Tunisia Turkey Turkmenistan Turks and Caicos Islands Tuvalu Uganda Ukraine United Arab Emirates United Kingdom of Great Britain and Northern Ireland United States Minor Outlying Islands Uruguay Uzbekistan Vanuatu Venezuela (Bolivarian Republic of) Vietnam Virgin Islands (British) Virgin Islands (U.S.) Wallis and Futuna Western Sahara Yemen Zambia Zimbabwe * Other * Shipping Method Name Estimated Delivery Price No shipping options Apply Custom wishlist OK Add to wishlist Add to compare list Email a friend Engine Distributor Advance Curve Kit Products specifications Attribute name Attribute value Applications GM HEI Distributors Pre to 1997 Category HEI Adv. Curve Kit Feature/Benefit HEI Advance Curve Kit. 🚗 Compatible with 525 vehicles are compatible with this product Year Make Model 1977 Buick Century 1978 Buick Century 1979 Buick Century 1978 Buick LeSabre 1977 Buick Regal 1977 Buick Skylark 1978 Buick Skylark 1979 Buick Skylark 1975 Chevrolet Bel Air 1975 Chevrolet K5 Blazer 1976 Chevrolet K5 Blazer 1977 Chevrolet K5 Blazer 1978 Chevrolet K5 Blazer 1979 Chevrolet K5 Blazer 1980 Chevrolet K5 Blazer 1981 Chevrolet K5 Blazer 1982 Chevrolet K5 Blazer 1983 Chevrolet K5 Blazer 1984 Chevrolet K5 Blazer 1985 Chevrolet K5 Blazer 1986 Chevrolet K5 Blazer 1975 Chevrolet C10 1976 Chevrolet C10 1977 Chevrolet C10 1978 Chevrolet C10 1979 Chevrolet C10 1980 Chevrolet C10 1981 Chevrolet C10 1982 Chevrolet C10 1983 Chevrolet C10 1984 Chevrolet C10 1985 Chevrolet C10 1986 Chevrolet C10 1981 Chevrolet C10 Suburban 1982 Chevrolet C10 Suburban 1983 Chevrolet C10 Suburban 1984 Chevrolet C10 Suburban 1985 Chevrolet C10 Suburban 1986 Chevrolet C10 Suburban 1975 Chevrolet C10 Suburban 1976 Chevrolet C10 Suburban 1977 Chevrolet C10 Suburban 1978 Chevrolet C10 Suburban 1979 Chevrolet C10 Suburban 1980 Chevrolet C10 Suburban 1975 Chevrolet C20 1976 Chevrolet C20 1977 Chevrolet C20 1978 Chevrolet C20 1979 Chevrolet C20 1980 Chevrolet C20 1981 Chevrolet C20 1982 Chevrolet C20 1983 Chevrolet C20 1984 Chevrolet C20 1985 Chevrolet C20 1986 Chevrolet C20 1981 Chevrolet C20 Suburban 1982 Chevrolet C20 Suburban 1983 Chevrolet C20 Suburban 1984 Chevrolet C20 Suburban 1985 Chevrolet C20 Suburban 1986 Chevrolet C20 Suburban 1975 Chevrolet C20 Suburban 1976 Chevrolet C20 Suburban 1977 Chevrolet C20 Suburban 1978 Chevrolet C20 Suburban 1979 Chevrolet C20 Suburban 1980 Chevrolet C20 Suburban 1975 Chevrolet C30 1976 Chevrolet C30 1977 Chevrolet C30 1978 Chevrolet C30 1979 Chevrolet C30 1980 Chevrolet C30 1981 Chevrolet C30 1982 Chevrolet C30 1983 Chevrolet C30 1984 Chevrolet C30 1985 Chevrolet C30 1986 Chevrolet C30 1975 Chevrolet Camaro 1976 Chevrolet Camaro 1977 Chevrolet Camaro 1978 Chevrolet Camaro 1979 Chevrolet Camaro 1980 Chevrolet Camaro 1981 Chevrolet Camaro 1982 Chevrolet Camaro 1983 Chevrolet Camaro 1984 Chevrolet Camaro 1985 Chevrolet Camaro 1986 Chevrolet Camaro 1986 Chevrolet Caprice 1978 Chevrolet Caprice 1981 Chevrolet Caprice 1975 Chevrolet Caprice 1976 Chevrolet Caprice 1977 Chevrolet Caprice 1979 Chevrolet Caprice 1980 Chevrolet Caprice 1982 Chevrolet Caprice 1983 Chevrolet Caprice 1984 Chevrolet Caprice 1985 Chevrolet Caprice 1977 Chevrolet Corvette 1978 Chevrolet Corvette 1979 Chevrolet Corvette 1980 Chevrolet Corvette 1981 Chevrolet Corvette 1982 Chevrolet Corvette 1984 Chevrolet Corvette 1985 Chevrolet Corvette 1986 Chevrolet Corvette 1975 Chevrolet Corvette 1976 Chevrolet Corvette 1975 Chevrolet El Camino 1976 Chevrolet El Camino 1977 Chevrolet El Camino 1978 Chevrolet El Camino 1979 Chevrolet El Camino 1980 Chevrolet El Camino 1981 Chevrolet El Camino 1982 Chevrolet El Camino 1983 Chevrolet El Camino 1984 Chevrolet El Camino 1985 Chevrolet El Camino 1986 Chevrolet El Camino 1983 Chevrolet G10 1975 Chevrolet G10 1976 Chevrolet G10 1977 Chevrolet G10 1978 Chevrolet G10 1979 Chevrolet G10 1980 Chevrolet G10 1981 Chevrolet G10 1982 Chevrolet G10 1984 Chevrolet G10 1985 Chevrolet G10 1986 Chevrolet G10 1975 Chevrolet G20 1976 Chevrolet G20 1977 Chevrolet G20 1978 Chevrolet G20 1979 Chevrolet G20 1980 Chevrolet G20 1981 Chevrolet G20 1982 Chevrolet G20 1983 Chevrolet G20 1984 Chevrolet G20 1985 Chevrolet G20 1986 Chevrolet G20 1975 Chevrolet G30 1976 Chevrolet G30 1977 Chevrolet G30 1978 Chevrolet G30 1979 Chevrolet G30 1980 Chevrolet G30 1981 Chevrolet G30 1982 Chevrolet G30 1983 Chevrolet G30 1984 Chevrolet G30 1985 Chevrolet G30 1986 Chevrolet G30 1975 Chevrolet Impala 1976 Chevrolet Impala 1978 Chevrolet Impala 1979 Chevrolet Impala 1980 Chevrolet Impala 1981 Chevrolet Impala 1982 Chevrolet Impala 1983 Chevrolet Impala 1984 Chevrolet Impala 1985 Chevrolet Impala 1977 Chevrolet Impala 1975 Chevrolet K10 1976 Chevrolet K10 1977 Chevrolet K10 1978 Chevrolet K10 1979 Chevrolet K10 1980 Chevrolet K10 1981 Chevrolet K10 1982 Chevrolet K10 1983 Chevrolet K10 1984 Chevrolet K10 1985 Chevrolet K10 1986 Chevrolet K10 1981 Chevrolet K10 Suburban 1982 Chevrolet K10 Suburban 1983 Chevrolet K10 Suburban 1984 Chevrolet K10 Suburban 1985 Chevrolet K10 Suburban 1986 Chevrolet K10 Suburban 1975 Chevrolet K10 Suburban 1976 Chevrolet K10 Suburban 1977 Chevrolet K10 Suburban 1978 Chevrolet K10 Suburban 1979 Chevrolet K10 Suburban 1980 Chevrolet K10 Suburban 1975 Chevrolet K20 1976 Chevrolet K20 1977 Chevrolet K20 1978 Chevrolet K20 1979 Chevrolet K20 1980 Chevrolet K20 1981 Chevrolet K20 1982 Chevrolet K20 1983 Chevrolet K20 1984 Chevrolet K20 1985 Chevrolet K20 1986 Chevrolet K20 1981 Chevrolet K20 Suburban 1982 Chevrolet K20 Suburban 1983 Chevrolet K20 Suburban 1984 Chevrolet K20 Suburban 1985 Chevrolet K20 Suburban 1986 Chevrolet K20 Suburban 1975 Chevrolet K20 Suburban 1976 Chevrolet K20 Suburban 1977 Chevrolet K20 Suburban 1978 Chevrolet K20 Suburban 1979 Chevrolet K20 Suburban 1980 Chevrolet K20 Suburban 1977 Chevrolet K30 1978 Chevrolet K30 1979 Chevrolet K30 1980 Chevrolet K30 1981 Chevrolet K30 1982 Chevrolet K30 1983 Chevrolet K30 1984 Chevrolet K30 1985 Chevrolet K30 1986 Chevrolet K30 1975 Chevrolet Malibu 1978 Chevrolet Malibu 1979 Chevrolet Malibu 1980 Chevrolet Malibu 1981 Chevrolet Malibu 1983 Chevrolet Malibu 1982 Chevrolet Malibu 1979 Chevrolet Monte Carlo 1981 Chevrolet Monte Carlo 1982 Chevrolet Monte Carlo 1983 Chevrolet Monte Carlo 1984 Chevrolet Monte Carlo 1985 Chevrolet Monte Carlo 1986 Chevrolet Monte Carlo 1976 Chevrolet Monte Carlo 1978 Chevrolet Monte Carlo 1980 Chevrolet Monte Carlo 1975 Chevrolet Monte Carlo 1977 Chevrolet Monte Carlo 1975 Chevrolet Monza 1976 Chevrolet Monza 1978 Chevrolet Monza 1979 Chevrolet Monza 1977 Chevrolet Monza 1975 Chevrolet Nova 1976 Chevrolet Nova 1977 Chevrolet Nova 1978 Chevrolet Nova 1979 Chevrolet Nova 1975 Chevrolet P10 1977 Chevrolet P10 1978 Chevrolet P10 1979 Chevrolet P10 1975 Chevrolet P20 1976 Chevrolet P20 1977 Chevrolet P20 1978 Chevrolet P20 1979 Chevrolet P20 1980 Chevrolet P20 1981 Chevrolet P20 1982 Chevrolet P20 1983 Chevrolet P20 1984 Chevrolet P20 1985 Chevrolet P20 1986 Chevrolet P20 1975 Chevrolet P30 1976 Chevrolet P30 1977 Chevrolet P30 1978 Chevrolet P30 1979 Chevrolet P30 1980 Chevrolet P30 1981 Chevrolet P30 1982 Chevrolet P30 1983 Chevrolet P30 1984 Chevrolet P30 1985 Chevrolet P30 1986 Chevrolet P30 1977 Oldsmobile Custom Cruiser 1980 Oldsmobile Cutlass 1978 Oldsmobile Cutlass Calais 1979 Oldsmobile Cutlass Calais 1980 Oldsmobile Cutlass Calais 1983 Oldsmobile Cutlass Calais 1984 Oldsmobile Cutlass Calais 1980 Oldsmobile Cutlass Cruiser 1982 Oldsmobile Cutlass Cruiser 1983 Oldsmobile Cutlass Cruiser 1978 Oldsmobile Cutlass 1979 Oldsmobile Cutlass 1978 Oldsmobile Cutlass Supreme 1979 Oldsmobile Cutlass Supreme 1980 Oldsmobile Cutlass Supreme 1983 Oldsmobile Cutlass Supreme 1985 Oldsmobile Cutlass Supreme 1986 Oldsmobile Cutlass Supreme 1977 Oldsmobile Delta 88 1977 Oldsmobile Omega 1978 Oldsmobile Omega 1979 Oldsmobile Omega 1980 Pontiac Catalina 1981 Pontiac Catalina 1977 Pontiac Firebird 1978 Pontiac Firebird 1979 Pontiac Firebird 1980 Pontiac Firebird 1981 Pontiac Firebird 1978 Pontiac Grand Am 1979 Pontiac Grand Am 1980 Pontiac Grand Am 1976 Pontiac Grand LeMans 1977 Pontiac Grand LeMans 1979 Pontiac Grand LeMans 1980 Pontiac Grand LeMans 1981 Pontiac Grand LeMans 1978 Pontiac Grand Prix 1979 Pontiac Grand Prix 1980 Pontiac Grand Prix 1976 Pontiac LeMans 1977 Pontiac LeMans 1979 Pontiac LeMans 1980 Pontiac LeMans 1981 Pontiac LeMans 1977 Pontiac Ventura 1977 Pontiac Laurentian 1981 Pontiac Laurentian 1981 Chevrolet Bel Air 1974 Chevrolet Bel Air 1974 Chevrolet Blazer 1974 Chevrolet C10 Pickup 1974 Chevrolet C10 Suburban 1974 Chevrolet C20 Pickup 1974 Chevrolet C20 Suburban 1974 Chevrolet C30 Pickup 1974 Chevrolet Camaro 1974 Chevrolet Caprice 1974 Chevrolet Corvette 1974 Chevrolet El Camino 1974 Chevrolet G10 Van 1974 Chevrolet G20 Van 1974 Chevrolet G30 Van 1974 Chevrolet Impala 1974 Chevrolet K10 Pickup 1974 Chevrolet K10 Suburban 1974 Chevrolet K20 Pickup 1974 Chevrolet K20 Suburban 1974 Chevrolet K30 Pickup 1974 Chevrolet Monte Carlo 1974 Chevrolet Nova 1974 Chevrolet P20 Van 1974 Chevrolet P30 Van 1977 Pontiac Parisienne 1981 Pontiac Parisienne 1981 Oldsmobile Cutlass 1987 Chevrolet Camaro 1975 Pontiac Firebird 1976 Pontiac Firebird 1974 Pontiac Firebird 1987 Chevrolet R10 1987 Chevrolet R20 1987 Chevrolet R30 1987 Chevrolet V10 1987 Chevrolet V20 1987 Chevrolet V30 1987 Chevrolet Blazer 1987 Chevrolet V10 Suburban 1987 Chevrolet R10 Suburban 1987 Chevrolet R20 Suburban 1987 Chevrolet V20 Suburban 1975 Buick Apollo 1975 Buick Century 1975 Buick Regal 1976 Buick Skylark 1987 Chevrolet G10 1987 Chevrolet G20 1987 Chevrolet G30 1975 Oldsmobile Omega 1976 Oldsmobile Omega 1975 Pontiac Grand Am 1975 Pontiac Grand Prix 1975 Pontiac LeMans 1975 Pontiac Ventura 1976 Pontiac Ventura 1974 Buick Century 1974 Oldsmobile Omega 1974 Pontiac Grand Am 1974 Pontiac Grand Prix 1974 Pontiac LeMans 1974 Pontiac Ventura 1987 Chevrolet Corvette 1976 Buick Century 1976 Buick Electra 1977 Buick Electra 1978 Buick Electra 1979 Buick Electra 1980 Buick Electra 1981 Buick Electra 1975 Buick Estate Wagon 1976 Buick Estate Wagon 1975 Buick LeSabre 1976 Buick LeSabre 1977 Buick LeSabre 1979 Buick LeSabre 1980 Buick LeSabre 1976 Buick Regal 1975 Buick Riviera 1976 Buick Riviera 1977 Buick Riviera 1978 Buick Riviera 1975 Buick Skylark 1987 Chevrolet Caprice 1975 Oldsmobile 98 1976 Oldsmobile 98 1977 Oldsmobile 98 1978 Oldsmobile 98 1979 Oldsmobile 98 1980 Oldsmobile 98 1981 Oldsmobile 98 1982 Oldsmobile 98 1983 Oldsmobile 98 1984 Oldsmobile 98 1975 Oldsmobile Custom Cruiser 1976 Oldsmobile Custom Cruiser 1978 Oldsmobile Custom Cruiser 1979 Oldsmobile Custom Cruiser 1975 Oldsmobile Cutlass 1977 Oldsmobile Cutlass 1976 Oldsmobile Cutlass 1975 Oldsmobile Cutlass Supreme 1976 Oldsmobile Cutlass Supreme 1977 Oldsmobile Cutlass Supreme 1975 Oldsmobile Delta 88 1976 Oldsmobile Delta 88 1978 Oldsmobile Delta 88 1979 Oldsmobile Delta 88 1980 Oldsmobile Delta 88 1981 Oldsmobile Delta 88 1982 Oldsmobile Delta 88 1983 Oldsmobile Delta 88 1984 Oldsmobile Delta 88 1985 Oldsmobile Delta 88 1981 Oldsmobile Custom Cruiser 1982 Oldsmobile Custom Cruiser 1983 Oldsmobile Custom Cruiser 1984 Oldsmobile Custom Cruiser 1985 Oldsmobile Custom Cruiser 1986 Oldsmobile Custom Cruiser 1975 Pontiac Bonneville 1976 Pontiac Bonneville 1977 Pontiac Bonneville 1978 Pontiac Bonneville 1979 Pontiac Bonneville 1980 Pontiac Bonneville 1981 Pontiac Bonneville 1975 Pontiac Catalina 1976 Pontiac Catalina 1977 Pontiac Catalina 1978 Pontiac Catalina 1979 Pontiac Catalina 1975 Pontiac Grand LeMans 1976 Pontiac Grand Prix 1977 Pontiac Grand Prix 1981 Pontiac Grand Prix 1976 Pontiac Grand Safari 1975 Pontiac Grandville 1987 Oldsmobile Custom Cruiser 1980 Oldsmobile Custom Cruiser 1974 Buick Apollo 1974 Buick Electra 1974 Buick Estate Wagon 1974 Buick LeSabre 1974 Buick Regal 1974 Buick Riviera 1974 Oldsmobile 98 1974 Oldsmobile Custom Cruiser 1974 Oldsmobile Cutlass 1974 Oldsmobile Cutlass Supreme 1974 Oldsmobile Delta 88 1974 Pontiac Bonneville 1974 Pontiac Catalina 1974 Pontiac Grand Safari 1974 Pontiac Grandville 1976 Pontiac Parisienne 1977 Pontiac Grand Safari 1978 Pontiac Grand Safari 1975 Pontiac Grand Safari 1987 Chevrolet El Camino 1987 Chevrolet Monte Carlo 1981 Oldsmobile Cutlass Calais 1982 Oldsmobile Cutlass Calais 1981 Oldsmobile Cutlass Cruiser 1987 Oldsmobile Cutlass Supreme 1981 Oldsmobile Cutlass Supreme 1982 Oldsmobile Cutlass Supreme 1984 Oldsmobile Cutlass Supreme 1979 Buick Riviera 1979 Oldsmobile Toronado 1980 Oldsmobile Toronado 1981 Oldsmobile Toronado 1982 Oldsmobile Toronado 1983 Oldsmobile Toronado 1984 Oldsmobile Toronado 1985 Oldsmobile Toronado 1987 Chevrolet P20 1987 Chevrolet P30 1975 Oldsmobile Vista Cruiser 1974 Oldsmobile Toronado 1974 Oldsmobile Vista Cruiser 1975 Oldsmobile Toronado 1976 Oldsmobile Toronado 1978 Oldsmobile Toronado 1977 Oldsmobile Toronado 1976 Pontiac Laurentian