The real fun started when they did a buildup of a 401 and got 481 HP and 497 FT Lbs of torque. 780hp AMC 401 Build - American Horsepower. … Again, mirroring all engines of the time, declining compression ratios ankled power numbers. In its first two years on sale, the Gremlin was only offered with six cylinders under the hood, good for a best-case scenario of 150 horsepower from an optional 4.2-liter mill in 1971. The distinctive supercharger whine is still a bit difficult to disguise, but with a near 800 hp on tap, maybe it isn’t really important if the rest of the world knows you’ve got power under the hood! These changes made this the third generation of AMC V8, hence it is sometimes referred to as the "Gen-3" AMC V8. The AMC Ambassador 1971 Hardtop 401 V8 Auto Brougham has a V 8, Petrol engine with 6573 cm3 / 401.1 cu-in capacity. With that, we had the makings of a serious street engine. If you have something to share let us know. Comp Cams; Memphis, TN; 800/999-0853; CompCams.com Interestingly, there was never a 2bbl version of this engine offered. The real fun started when they did a buildup of a 401 and got 481 HP … 390? In past years, we’ve showed you tunnel-rams and nitroused small-blocks, so the next logical step was to stuff a blower on the venerable American motor. Accessible Technologies, Inc. (ProCharger); Lenexa, KS; 913/338-2886; ProCharger.com Copyright © 2021 BangShift.com All Rights Reserved. Old-school provenance has always been to default to the classic 6-71 supercharger projecting carburetors up through the hood. Information about AMC engines and their specifications. While rebuilding the 401 V8 from my ’77 Wagoneer, I found that the camshaft it had (which appeared to be aftermarket, since the measured lobe lift was higher than stock on many lobes) was quite worn. Edelbrock part #7132 Performer RPM Camshaft is designed for AMC 343-401 V-8 applications. We Celebrate The 401 V8 Here! 199: 232: 258: 290: 304: 343: 360: 390: 70-390: 401: Production years: 1965-1970: 1964-1979: 1971-1990 Competition Carburetion, LLC; Sun Valley, NV; 775/331-5609; CompetitionCarburetion.com AMX with a claimed 700 Horsepower on the set. of torque when used with #7531 intake and #60119 cylinder heads on a 401 engine. Sources Horsepower topped out at 525.3 at 6,100 rpm. That’s damn strong for any street engine—especially considering the simplicity of adding the supercharger to the engine. 304? But in the 21st century, you can get much more out of a small centrifugal that you might be able to keep buttoned up under a bulging hood. Total Seal Piston Rings; Phoenix, AZ; 623/587-7400; TotalSeal.com, By clicking Sign Up, you agree to the Terms of Use. Your email address will not be published. The AMC 401 V8 was the powerful around 400 cubic-inch displacement V8 engine which AMC sorely needed since the mid-1960s. © 2021 Four Wheeler | MOTOR TREND GROUP, LLC. Amc 401 Crate Engine. Our pals at The Supercharger Store got a call from customer Glen Helmes, who wanted to build a centrifugally urged AMC 401. While no supercharged AMC 401 buildup can truthfully be called a budget effort, the plan was still to avoid breaking the bank on the way to horsepower-hero status. The 435 idled smoother @ 1000 RPM in spite of the bigger cam. No. Larry’s didn’t baseline this engine normally aspirated, but we can assume that this engine could easily make at a minimum of 1 hp per cubic inch, which would put the power at around 400 to 420 hp. The Supercharger Store’s Bob Woods enlisted the help of Larry Peto at Larry’s Engine & Marine to build the engine and then adapt a ProCharger D1-SC supercharger to the front of the AMC 401. We were in a Jeep club (we ran a 351W powered CJ-5 on nitrous with a toploader), did lots of AMC work. This AMX mill is big on torque with a flattering amount of horsepower. In 1972, with the endorsement of AMC corporate, the performance dealer would unleash the most potent “factory” Gremlin ever produced — the 401-XR. Got that one and today we have the big daddy of the lineup the AMC 401 V8. Engine type: AMC V-8 401: Displacement: 6.6 l (401 ci / 6571 cc) Power: 335 ps (330 bhp / 246 kw) @ 5000 rpm Torque: 583 Nm (430 lb-ft) @ 3400 rpm Power / liter: 51 ps (50 hp) Power / weight The accepted rule is that beyond 8 psi of boost, most engines really need an intercooler. The 1970 AMC Ambassador 1971 Hardtop 401 V8 Auto SST has 330 PS / 326 bhp / 243 kW. The first displacements from 1966 to 1969 were 290, 343 and 390. The only other real difference inside the engine with the 401 as opposed to other engines in the lineup were the diameter of the bearing journals. This engine came in on the ragged tail of the muscle car era (AMC was always a little late with anything good) and carried a rating a 330hp for that one shining year in 1971. AMC V8 engine Gen-3 AMC V8 being assembled. Goodguys Spring Lone Star Nationals Photos Continue Right Here. No. Interestingly, AMC made the swap to use Chrysler Torqueflite transmissions after 1972 so the cranks are slightly different to accommodate that change. Edelbrock; Torrance, CA; 310/781-2222; Edelbrock.com Federal safety watchdogs, state and national emissions regulators, insurance companies -- even a changing social climate -- all took aim at the high-performance car. 20′ steel trailer, and it was “Pick your opening on the freeway, an drive it in there”. Since the AMC housing's diameter was too small to accept the Allstar Performance dropped baseplate Jeff chose, he instead cut the bottom out of a larger 1968 Oldsmobile Delmont 88 housing to weld in the new dropped baseplate. Rockett Brand Racing Fuel; Yorba Linda, CA; 714/694-1286; RockettBrand.com AMC 401 V8 Although compression had been lowered to 8.5:1, the 401's output in 1973 was listed as … Mosler MT900 (435 hp) gets 6.95 stars, Lamborghini Murcielago (572 hp) and Dodge Viper SRT10 (500 hp) would have 6.9 stars, and the 2000 Saleen S7 (non-turbo) would have 6.8 stars. With no changes to ignition timing or blower pulleys, the discharge temperature dropped at the lower boost levels from 117 degrees F to 92 degrees, but at peak rpm, the differential had shrunk to roughly 10 degrees. One other way to gain both reduced outlet temperatures and added octane is with that magic alcohol E85 fuel. The Hornet replaced the compact Rambler American line, marking the end of the Rambler marque in the American and Canadian markets. It pulled more than 400 lb-ft of torque through all the lower rpm range and up to 6,500 rpm, peaking at 520.6 lb-ft at 4,900 rpm. Amc 401 … How many horsepower (hp) does a 1970 AMC Ambassador 1971 Hardtop 401 V8 Auto SST have? The 401 Javelin should have (at least) seven stars for its acceleration. The first in 1972 with a 0-60 mph in 8.3, and 1/4 mile in 16.1; and the second test in 1973 with 0-60 in 7.7 seconds, and the 1/4 mile in 15.5; unfortunately they don't quote the magazine source so I won't add the acceleration times. I never had an issue with those engines, they did well and responded well to the normal stuff. With experience and hindsight as our guide, a future venture into AMC v8 engine building would be far better executed by spending the money for a set of Edelbrock aluminum heads. Your email address will not be published. Specs datasheet with technical data and performance data plus an analysis of the direct market competition of AMC Javelin AMX V-8 401 4-speed (man. It was a 2BBL. Amc 401 Engine Specifications . This "401" engine was available from 1971-1974. This car had so much potential. The 1972-1975 engines were rated at 255hp and used an 8.5:1 squeeze ratio inside the engine. Follow along as we detail both the buildup of the AMC 401 and the dyno test of the American way to horsepower happiness. Welcome to the latest AMC v8 engine rodeo. The 401 was the biggest, strongest engine that AMC offered. We were shocked by the 791 hp peak number at a mere 6,000 rpm. The 1970 AMX 390 remained at the same displacement by using a special rod and piston for this year only. For all you AMC fans out there you GOTTA check out the next Horsepower T.V episode on TNN Tomorrow! Even a year earlier in 1970, when muscle cars were at their pinnacle, the signs were there for those who chose to look. The first generation, for example, tops 315 horsepower thanks to a 6.4-liter engine, ... the AMC 401 CI V8. AMC Matador Sedan 401 0-60 mph, quarter mile (1/4 mile), top speed, 0-100 kph and 56 other acceleration times The pump-gasoline discharge temperatures would have been much higher without the water injection. Max boost was 13.3 psi. From previous testing, we knew that E85’s added octane and cooling abilities would probably be worth some additional power. 1971 AMC Matador 401 Go-Machine specs, 0-60, performance data, top speed, engine specifications, pictures. 780hp AMC 401 Build - American Horsepower! From 1972-1974 in AMC car applications, the 401 produced 235 net horsepower with single exhaust and 255 net horsepower with dual exhaust both engines had 345 lb-ft of net torque. The AMC 401 was introduced in 1974 as an optional engine for the J-series pickups and Wagoneers. This Edelbrock cam kit produced 433 HP & 489 ft-lbs. This V-8 was produced with 4.17 x 3.57-inch bore and stroke dimensions and came only with a four-barrel carburetor and a dual exhaust system.