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one could never have enough horsepower, i drive my impala once in a while,i dont like the whole thing of having a classic muscle car and not enjoying it.I already know that a 427 big block already has enough power,but like i said earlier, the motor is original and is a original ss,so i dont want to ruin the motor,but then i was thinking maybe the 572 has enough power to shift the body and thats definately a big no.and i dont want to tube the car.
 
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Keep it with the factory motor. Its worth a lot more. Cherry it out and watch your money grow. I hav a 67 imp ss and Im doing the same thing. I also have a 63 split window BLOWN 454 auto....1000hp...it will stain your shorts...
 
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yeah but that 650hp on pump gas sounds tempting. If you have the ability to throw in a new motor you should have the ability to do a little chasis strengthening
 
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Chevrolet Impala
From Wikipedia, the free encyclopedia

Manufacturer General Motors
Production 1958–1985 Class Full-size (1958-1996)
One of General Motors and America's most successful auto nameplates, the Impala was often the best-selling automobile in years when full-sized cars dominated sales. The 1965 sales of over one million units still stands as a record.
The Impala name was first used for the Corvette-based show car for the 1956 General Motors Motorama. Painted emerald green metalic, with a white interior, the Impala featured hardtop styling.
1965-1970
Third generation Production 1965-1970
Assembly Arlington, Texas
Body style(s) 2-door convertible
2-door coupe
2-door hardtop
4-door hardtop
4-door sedan
4-door station wagon
Layout FR layout
Platform B-body
Engine(s) 250cid 155bhp Turbo Thrift I6
283cid 195bhp-220bhp Turbo Fire V8
307cid 115bhp-200bhp Turbo Fire V8
327cid 250-375bhp Turbo Fire V8
350cid 250-350bhp Turbo Fire V8
396 265bhp-425bhp Turbo Jet V8
427 335bhp-425bhp Turbo Jet V8
Redesigned again in 1965, the Impala set an all-time industry annual sales record of more than 1 million units in the U.S., which has never been bettered. In 1965, Chevrolet introduced the Impala Caprice. Beginning with the four-door hardtop sedan body, Impala Caprices received unique upholstery, wood grained accents on the dashboard and specialty pulls on the insides of the doors. The Impala Caprice was reintroduced as the Chevrolet Caprice in 1966, taking the top position in the full-size During the 1969 model year, for example, Impala production topped Caprice production by 611,000 units.
235cid Blue Flame 6 (1958-1962)
230cid 140bhp Turbo Thrift 6 (1963-1965)
250cid 155bhp Turbo Thrift 6 (1966-1969)
Small block V8s:
283cid 195bhp-220bhp Turbo Fire V8 (1957-1967)
307cid 200bhp Turbo Fire V8 (1968)
327cid 235-375bhp Turbo Fire V8 (1961-1969)
350cid 250-350bhp Turbo Fire V8 (1969-1980)
400cid 255-265 bhp Turbo Fire V8 (1970-1976)
Big block V8s:
348 W-series Turbo Thrust V8, 250bhp-350bhp (1958-1961)
409 W-series Turbo Thrust V8, 340bhp-425bhp (mid-1961 to early 1965); This engine was immortalized in the Beach Boys song titled "409".
427 W-series big block, (1963)
396 265bhp-425bhp Turbo Jet V8 (mid-1965 to 1969); sung about in the song "SS 396"
427 335bhp-425bhp Turbo Jet V8 (1966-1969)
454 345-390bhp(1970-1976)
Impala SS
1961, the Impala SS (Super Sport) was introduced to the market. The SS badge was to become Chevrolet's signature of performance on many models, though it has often been an appearance package only. The Impala's SS package in 1961 was truly a performance package, beginning with the high-performance 348 in³ (5.7 L) V8 engines (available with 305, 340, and 350 hp (230, 255 and 260 kW)) or the new 409 in³ (6.7 L) V8, which was available with up to 425 hp. The package also included upgraded tires on station wagon wheels, springs, shocks and special sintered metallic brake linings. Starting in 1962, the Impala SS could be had with any engine available in the Impala, down to the 235 in³ 135 hp inline-6. With one exception, from this point until 1969, the SS was an appearance package only, though the heavy-duty parts and big engines could still be ordered. From 1962-on, Super Sports were limited to the hardtop coupe and convertible coupe exclusively.
The exception was the Z24 option package available in combination with the standard Z03 Super Sport package. Starting in 1967 through 1969, buyers of Impala Z24s got cars badged as "SS427" models. The SS427 included a heavy-duty suspension and other performance goodies, as well as a Turbo-Jet 427 in³ V8 in either L36 (385 hp 1967-1968 390hp in 1969) or L72 (425hp RPO 1968-1969 only. 17 L-72s were rumored to have been built in 1967; however, this has been disputed and none has surfaced as yet. Special SS427 badging, inside and out, was the rule. From 1968 to 1969, Z24s could be ordered without the Z03 SS package, which meant SS427 equipment but no bucket seats or center console. The Impala SS could be identified by "SS" emblems on the rear fenders and trunk lid. The Impala SS became its own series (separate model rather than an option package) for 1964. In 1968, the Impala SS once again became an option package. 1967 and 1968 SS427s got a special domed hood and body emblems, and the 1968 model featured "gills" on the front fenders in front of the wheel opening, possibly to remind people of its Corvette cousin. In 1969, the Impala SS was available only as the Z24 (SS427), coming exclusively with a 427 in³ V8 of 335, 390 or 425 hp. This was the final year for the Impala SS until 1994.
1969 was the last year that the Impala SS was offered with the Z24 package, but the only year in which front disc brakes and 15 inch wheels were standard; that made the 1969 SS427 better than the previous version. Although the 427 was replaced by the 454 in³ Turbo-Jet V8 in 1970, the SS option was gone. Thus, the 1969 Impala SS427 got the best of both worlds, which is why it is so valuable and is often cloned today.
Having read the above, if you modify your '69 SS 427 by changing the engine, you should be drawn and quartered, keel hauled, hanged from the yardarms and flogged.
 
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