WWCK-FM
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| City | Flint, Michigan |
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| Broadcast area | Flint, Michigan |
| Branding | CK-105.5 |
| Slogan | Flint's New #1 for All The Hits |
| Frequency | 105.5 MHz (also on HD Radio) |
| First air date | September 1964 |
| Format | Top 40 (CHR) |
| Power | 25,000 watts |
| HAAT | 100 meters |
| Class | B1 |
| Facility ID | 39678 |
| Transmitter coordinates | 43°00′39″N 83°39′4″W / 43.01083°N 83.65111°W |
| Callsign meaning | reminiscent of CKLW |
| Former callsigns | WMRP-FM (1964-12/5/71) |
| Owner |
Cumulus Broadcasting (Cumulus Licensing LLC) |
| Sister stations | WDZZ, WFBE, WTRX, WWCK-AM |
| Webcast | Listen Live |
| Website | ck1055.fm |
WWCK-FM (105.5 FM, "CK105.5") is a radio station in Flint, Michigan, broadcasting an adult-oriented Top 40 (CHR) format. The station is owned by Cumulus Media and has programmed its current format since 1989. Its studios are located south of the Flint city limits and its transmitter is east of downtown Flint.
105.5 FM originally went on the air in 1964 as WMRP-FM. The WMRP calls stood for Methodist Radio Parish. WMRP-FM aired a Beautiful Music format while WMRP-AM 1570 played MOR; the conservative owners of the stations prohibited any advertising for tobacco or alcohol products.
In 1971, the United Methodist Church withdrew support for WMRP-AM/FM, and the stations were sold that year to John W. Nogaj, who changed the FM's call letters to WWCK on November 1971 as a tribute to Windsor, Ontario's powerhouse CKLW and installed a dayparted daytime Top 40/nighttime AOR format. AM 1570, meanwhile, went country and later oldies as WCZN.
Nogaj sold WCZN-AM and WWCK-FM in 1975 to Reams Broadcasting, who changed WWCK's format on October 1975 to full-time AOR. As "Flint's Best Rock," WWCK was a market leader in Flint for many years, and was named the top-rated rock station in the United States in 1985. WWCK-FM was also the home of Filmmaker Michael Moore's "Radio Free Flint" from 1980 through 1985 and "Buffalo Dick's Radio Ranch" with Jeff Lamb, voted "Best Local Programming/All Markets" by Billboard Magazine in 1982.
In December 1988, Reams Broadcasting sold AM 1570 and FM 105.5 to Majac of Michigan. Majac abruptly changed CK105's format from AOR to CHR on New Year's Day of 1989, with WWCK-AM 1570 serving as a shadowcast of the FM. This marked the first time Flint had a Top 40 or CHR station of its own since WTAC-AM 600 changed from Top 40 to country music in 1981. Fans of the AOR format were unhappy with the change, but CK105.5's new format took off in the ratings and posted several number one showings (12+) in the Flint Arbitron reports through the 1990s.
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