--- title: "1977 Ford F-100: Rectangular Headlights, 351M V8 Specs & Guide | fordf100s.com" description: "The 1977 Ford F-100 featured a new grille with optional rectangular headlights and 351M/400 V8 options replacing the FE engines." canonical_url: "https://www.fordf100s.com/1977-ford-f100/" last_updated: "2026-07-17" --- 1. [ Home ](/) 2. / [ Generations ](/generations/) 3. / [ 1973-1979 Ford F-100 Dentside Guide ](/generations/1973-1979/) 4. / 1977 Ford F-100: Rectangular Headlights, 351M V8 Specs & Guide Generation 6 · 1973–1979 # 1977 Ford F-100: Rectangular Headlights, 351M V8 Specs & Guide Top Engine 400M V8 · 173 hp Wheelbase 117 in (short bed), 133 in (long bed), 139/155 in (SuperCab) Original MSRP $4,116 Production 197,822 fordf100s.com · Updated July 17, 2026 Jump to Year [ 1973 ](/1973-ford-f100/)[ 1974 ](/1974-ford-f100/)[ 1975 ](/1975-ford-f100/)[ 1976 ](/1976-ford-f100/)[ 1977 ](/1977-ford-f100/)[ 1978 ](/1978-ford-f100/)[ 1979 ](/1979-ford-f100/) Factory Spec Sheet MODEL YEAR 1977 __General Specifications__ | Wheelbase | 117 in (short bed), 133 in (long bed), 139/155 in (SuperCab) | | ------------------ | ------------------------------------------------------------ | | Curb Weight | 3,840 lbs | | Body Styles | pickup, styleside, flareside | | Original MSRP | $4,116 | | Production Numbers | 197,822 | __Engine Options__ | Engine | Displacement | Horsepower | Type | | -------------- | ------------ | ---------- | -------- | | 300 Six | 300 ci | 113 hp | inline-6 | | 302 Windsor V8 | 302 ci | 134 hp | v8 | | 351M V8 | 351 ci | 161 hp | v8 | | 400M V8 | 400 ci | 173 hp | v8 | Available Transmissions - 3-speed manual - 4-speed manual - C6 3-speed automatic Sources & Editorial ReviewSource reviewed Reviewed by the [FordF100s.com editorial team](/about/#editorial-standards) on July 17, 2026. The model-year engine applications, horsepower ratings, major design changes, and identification claims were reconciled against period literature and year-specific specialist references. Full-line F-Series applications were excluded when the source did not support an F-100 application. References used 1. [Ford Heritage Vault](https://fordheritagevault.com/) — Ford Motor Company · Factory literaturePeriod brochures, sales literature, and manuals used to check model-year claims. 2. [Ford truck literature library](https://www.fordification.com/library/) — Fordification.com · Specialist reference Horsepower changed from SAE gross to SAE net reporting for 1972, so figures on opposite sides of that change are not directly comparable. Production totals, weights, prices, option availability, and midyear changes can vary by source and configuration; treat them as reference points, not proof of a specific truck's original equipment. Found a conflict in factory literature or have a better source? See our [corrections process](/about/#corrections). The 1977 Ford F-100 arrived with the most noticeable styling update since the generation’s 1973 launch. A new grille design gave the truck a distinctly different face, and for the first time, rectangular headlights were available as an option in place of the traditional round units. The engine lineup was also rationalized, with the aging [FE engines](/glossary/fe-engine/) retired from the F-100 VIN tables and the 351M stepping in as the smaller Modified-family V8. The rectangular headlight option was the most visible change and gave the 1977 F-100 a more modern appearance. Federal regulations had only recently permitted non-round sealed beam headlights, and Ford was quick to adopt the new format. Trucks equipped with the rectangular lights had a grille designed to accommodate them, while trucks with round headlights received a different grille insert. Both versions shared the same surround and overall front-end proportions. The rectangular headlight trucks are easy to identify and have become the more desirable configuration among collectors. The powertrain lineup underwent its most significant change of the generation. The 360 and 390 FE engines were dropped, and Ford’s 1977 pickup brochure lists the [300 Six](/glossary/300-six/), 302 [Windsor](/glossary/windsor/), 351M, and 400 for the F-100\. The same factory chart reserves the 460 for the F-150, F-250, and F-350. Inside, the cab received updated trim options. The Ranger XLT benefited from new fabric choices and revised door panel trim. Air conditioning continued as a popular option, as did power steering and power brakes, which were becoming expected equipment rather than luxury add-ons. An AM/FM radio was available, and Ford offered an optional 8-track tape player for buyers who wanted music on the road. The [SuperCab](/glossary/supercab/) maintained its 139- and 155-inch wheelbase choices and continued to gain market share as buyers discovered the practicality of the extended cab layout. Both the [Styleside](/glossary/styleside/) and [Flareside](/glossary/flareside/) beds remained available on regular cab trucks. Production was approximately 197,822 F-100 units. The broader F-Series was growing dominant in the truck market, but the F-150, which Ford had introduced in 1975 as an intermediate model between the F-100 and F-250, was gaining traction and would eventually replace the F-100 entirely. For 1977, the F-100 still offered the lighter half-ton configuration, and the combination of updated styling, the 351M/400 engine transition, and the refined [Dentside](/glossary/dentside/) package made it a compelling truck. Next useful step ## Inspect before you buy a 1977 F-100 Use the matching buyer guide for rust locations, configuration checks, and questions to ask before money changes hands. [ Open the buyer guide → ](/buying-a-1977-ford-f100/) [ Decode a VIN ](/vin-decoder/) [← 1976 Ford F-100](/1976-ford-f100/)[1978 Ford F-100 →](/1978-ford-f100/) ## Build a 1977 F-100 [RestorationF-100 AC Installation Guide (1948-1983)Vintage Air, Classic Auto Air, and Old Air Products kits compared for every F-100 generation. Costs, installation steps, and electrical requirements.](/restoration/ac-installation-guide/)[RestorationF-100 Crown Vic Swap: Donor Years, Wheel Fit & PlanningPlan an F-100 Crown Vic front suspension swap: 2003-2011 donors, P71 choices, wheel fit, frame mounts, steering, brakes, and what a complete budget includes.](/restoration/crown-vic-swap-guide/)[RestorationDaily Driver F-100: Modern Upgrade GuideTurn your F-100 into a reliable daily driver with this guide covering disc brakes, power steering, EFI, AC, wiring, and safety upgrades.](/restoration/daily-driver-build-guide/)[PartsF100 Suspension Upgrade Options by GenerationCompare F100 suspension upgrades: Mustang II IFS, Crown Vic swaps, lowering beams, rear axle flips, coilovers, air ride, and chassis planning.](/parts/suspension-upgrades/)[PartsF100 Transmission Options by Year and GenerationEvery Ford F100 transmission from 1948-1983, including factory options, compatibility crossovers, and popular swaps like the T-5, TKO, and AOD.](/parts/transmissions/)[PartsF100 Wiring Harness Guide: Rewiring Your Ford TruckGuide to rewiring your Ford F100 with harness options from Painless, American Autowire, plus alternator conversions and fuse box upgrades.](/parts/wiring-harness/) ## Keep Exploring [Generation Guide1973-1979 Ford F-100 Dentside GuideFull generation overview — design changes, engines, and buying advice](/generations/1973-1979/)[Buyer's GuideBuying a 1977 Ford F100: Complete Buyer's GuideWhat to inspect, what to pay, and what to avoid](/buying-a-1977-ford-f100/)[ComparisonFord F-100 vs Chevy C10: Specs, Prices & Which to BuyFord F100 vs Chevy C10 compared: design, engines, suspension, aftermarket support, restomod potential, and market values from the 1960s-1970s.](/ford-f100-vs-chevy-c10/)[ReferenceF-100 Timeline 1948–1983Every model year and generation in one view](/history/f100-timeline/)[ToolVIN DecoderVerify the year, engine, and plant on any 1977 F-100](/vin-decoder/) ## Frequently Asked Questions What changed in the 1977 Ford F-100? For the 1977 model year, notable changes included: New grille with optional rectangular headlights, 351M and 400 V8 coverage, FE engines discontinued, revised interior trim As the fifth year of the sixth-generation F-100 (Dentside), the 1977 Ford F100 built on the prior year while setting up what came next in the 1973-1979 run. Where does the 1977 Ford F100 sit within the 1973-1979 generation? The 1977 Ford F-100 was the fifth model year of the sixth-generation F-100 (Dentside), placing it at the midpoint of the 1973-1979 run. By 1977, the generation had stabilized and buyers benefited from several years of running changes. The 1977 specifically added: New grille with optional rectangular headlights, 351M and 400 V8 coverage, FE engines discontinued, revised interior trim What engines were available in the 1977 Ford F-100? The 1977 Ford F-100 offered 4 engine options: 300 Six (300 ci, 113 hp); 302 Windsor V8 (302 ci, 134 hp); 351M V8 (351 ci, 161 hp); 400M V8 (400 ci, 173 hp). The lineup drew from the small-block Windsor, the 335-family M-series, Ford’s inline-six. The strongest available was the 400M V8 at 173 horsepower, while the base engine was the 300 Six at 113 horsepower. Transmission choices were 3-speed manual, 4-speed manual, C6 3-speed automatic. What does a 1977 Ford F100 weigh and measure? The 1977 Ford F-100 had a wheelbase of 117 in (short bed), 133 in (long bed), 139/155 in (SuperCab) and a curb weight of 3,840 lbs. Factory body styles included pickup, styleside and flareside. It was part of the sixth-generation F-100 (Dentside) (1973-1979), a generation defined by the Dentside body-side crease, SuperCab availability, and the broadest V8 lineup in F-100 history. What should I look for when buying a 1977 Ford F100? Focus your inspection on the 1977-specific items: New grille with optional rectangular headlights, 351M and 400 V8 coverage, FE engines discontinued, revised interior trim With 4 factory engine options spanning 113 to 173 horsepower, verifying that a specific 1977 truck has its original engine matters more for value than for most years before or after. Production of only 197,822 makes a clean 1977 Ford F100 genuinely uncommon today. Prioritize trucks with documented history over cosmetic presentation — a clean 1977 with receipts beats a repainted example with an unknown past. Model Years - [1973 Ford F-100: Dentside Debut, 6th Gen Specs & Values](/1973-ford-f100/) - [1974 Ford F-100: SuperCab Debut & 460 V8 Option](/1974-ford-f100/) - [1975 Ford F-100: Catalytic Converter Era Specs & Values](/1975-ford-f100/) - [1976 Ford F-100: Final FE Year, Specs & Values](/1976-ford-f100/) - [1977 Ford F-100: Rectangular Headlights, 351M V8 Specs & Guide](/1977-ford-f100/) - [1978 Ford F-100: Restyled Grille, Specs & Collector Values](/1978-ford-f100/) - [1979 Ford F-100: Free Wheeling Package, Final Dentside Specs](/1979-ford-f100/) Model Years - [1973 Ford F-100: Dentside Debut, 6th Gen Specs & Values](/1973-ford-f100/) - [1974 Ford F-100: SuperCab Debut & 460 V8 Option](/1974-ford-f100/) - [1975 Ford F-100: Catalytic Converter Era Specs & Values](/1975-ford-f100/) - [1976 Ford F-100: Final FE Year, Specs & Values](/1976-ford-f100/) - [1977 Ford F-100: Rectangular Headlights, 351M V8 Specs & Guide](/1977-ford-f100/) - [1978 Ford F-100: Restyled Grille, Specs & Collector Values](/1978-ford-f100/) - [1979 Ford F-100: Free Wheeling Package, Final Dentside Specs](/1979-ford-f100/) VIN Decoder Decode supported F-100 VIN formats, or use the 1961-1983 data plate decoder for source-backed paint, trim, axle, and transmission codes. [Decode a VIN → ](/vin-decoder/) [1961-1983 Data Plate Decoder → ](/data-plate-decoder/) ### Guides for This Era - Restoration [ F-100 AC Installation Guide (1948-1983) ](/restoration/ac-installation-guide/) - Restoration [ F-100 Crown Vic Swap: Donor Years, Wheel Fit & Planning ](/restoration/crown-vic-swap-guide/) - Restoration [ Daily Driver F-100: Modern Upgrade Guide ](/restoration/daily-driver-build-guide/) - Parts [ F100 Suspension Upgrade Options by Generation ](/parts/suspension-upgrades/) - Parts [ F100 Transmission Options by Year and Generation ](/parts/transmissions/) - Parts [ F100 Wiring Harness Guide: Rewiring Your Ford Truck ](/parts/wiring-harness/)