The Rebel's engine differs from the 327s installed in the 1957 Nash Ambassador and Hudson Hornet models in that it uses mechanical valve lifters and a higher compression ratio. The SR block also sold as a heavy duty racing block. Output for the optional four-barrel carburetor version is 280 hp (209 kW; 284 PS) and produces 365 lb⋅ft (495 N⋅m) of torque (gross). Maximum factory recommended overbore is only 0.020 in (0.51 mm), although they are commonly bored 0.030 in (0.76 mm). They were an early American muscle car. It has a bore and stroke of The 343 cu in (5.6 L) has a bore and stroke of 4.08 in × 3.28 in (103.6 mm × 83.3 mm). In 1970, AMC changed the head to the "dog-leg" exhaust port design. The Rebel name was added to differentiate the standard six-cylinder Rambler from the V-8 model. There is a persistent myth about 1970-mid 1971 319 and 291 AMC heads. The only difference between small and large chamber Gen-3 heads is the combustion chamber size. It is believed that AMC kept the 390 this last year due to the reputation it had garnered in the two seater AMX, which was discontinued after 1970. The other change in 1970 was the switch to the "dog-leg" heads. The intakes can be interchanged by slotting the bolt holes, but the added deck height of the GEN-3 engine means that sealing and port match will be compromised.

The Rebel was a Rambler with a V-8 (and necessary mods such as stronger front springs and rear axle). This setup was utilised by Chrysler for the 1958 model year on its The 250 and 327 were also offered as a marine engine known as the "Fireball" by The new-generation AMC V8 was first introduced in 1966.All three engine sizes - 290 cu in (4.8 L), 343 cu in (5.6 L), and 390 cu in (6.4 L) - share the same basic block design—the different Bore center measurement was kept the same as the Gen-1 V8 at 4.75 in (120.7 mm) so that boring equipment could be reused. Gen-3 intakes can be machined to fit Gen-2 engines by surface grinding the intake flanges and slotting the center holes.

The Gen-2 is closer to the physical size of U.S. made small-block V8s except for the bore centers, which are the same as some big-block engines. By switching to a convex floor the curvature of the flow starts in the head and proceeds much more smoothly into the exhaust manifold resulting in less turbulence and better flow.

{"modules":["unloadOptimization","bandwidthDetection"],"unloadOptimization":{"browsers":{"Firefox":true,"Chrome":true}},"bandwidthDetection":{"url":"https://ir.ebaystatic.com/cr/v/c1/thirtysevens.jpg","maxViews":4,"imgSize":37,"expiry":300000,"timeout":250}}3 Year Unlimited Mileage Warranty and Free ShippingIncludes Power Steering, Hi Rise intake 258 replacementTHIS IS THE ENGINE ASSEMBLY! In addition to the largest bore and stroke, the 390 cu in (6.4 L) AMX motor also received heavier main bearing support webbing and a forged steel crankshaft and connecting rods. Since it was a standard factory part it did not have to be homologated under T/A rules, and American Motors Corporation "Rambler V8" (1956–1967)American Motors Corporation "Rambler V8" (1956–1967)The list is compiled from "Performance American Style" (mainly), "American Cars 1946-1975" and various automotive manuals, technical service manuals, published road tests, and AMC's pamphlets. For more recent exchange rates, please use the This page was last updated: 04-Sep 09:27. Find JEEP 5.9L/360 AMC V8 Summit Racing and get Free Shipping on Orders Over $99 at Summit Racing! It was built from the mid-1966 model year through the 1969 model year. There are two reasons for the flow increase: (1) the area of the port is larger, due to the dog leg and (2) the shape of the port floor was changed from a concave to a convex curve.

Number of bids and bid amounts may be slightly out of date. In 1975 and 1976, emission controls, insurance rates, and high gasoline prices meant the 401 was available on the large Matador model, and then only for police department orders. SHIPS TO BUSINESS ONLY! Enter Year. There was a U.S. auto industry-wide shift to lower compression ratios in mid 1971, so AMC increased combustion chamber size to 58-59 cc.

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