Should i change my 427 block, and put a 572 on a 69 impala ss.?

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.

8 Answers

  • Anonymous
    1 decade ago
    Favorite Answer

    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.


    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.

  • 1 decade ago

    I would rebuild the 427. Have it bored and honed even consider a longer throw crank and or rods. Keep the compression ratio in mind so you can burn 'pump' gas A strong cam with lots of low end torque is preferable since these cars are pretty heavy. A three deuce intake and carbs are also a viable addition ( I have this setup in my 69 camaro and it romps) Keep the original block in the car and you will keep the value.

    Have FUN!

  • 1 decade ago

    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 will stain your shorts...

  • 1 decade ago

    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.

    But yeah if you want to keep the original motor pristine but still take it down the 1320 swap out the original motor in put that crate one in.

  • How do you think about the answers? You can sign in to vote the answer.
  • 4 years ago

    hi Lil Trill, I checked my GM substances for you and placed that in the journey that your Impala has the 5.3 L V8 engine (VIN Code C), it truly is counseled that you employ unleaded gasoline with a printed octane score of ninety one or more desirable. you are able to also use time-honored unleaded gasoline rated at 87 or more desirable, yet your Impala's acceleration will be somewhat decreased, and also you are able to observe a mild audible knocking noise (or "spark knock"). If the octane is below 87, you are able to observe a heavy knocking noise once you stress; if this takes position, use a gasoline rated ninety seven or more desirable once achieveable. you would damage your engine in the different case. once you're making use of 87 or more desirable gasoline and hear heavy knocking, please go for your Chevrolet dealership for engine service! for more desirable assistance, see web page 5-5 of your owners guide! desire this helps, Katie GM shopper service

  • 1 decade ago

    If you take the original engine out and "rod" the car, you will destroy the value of a classic. Its not worth it, unless you have millions to burn. And burn it you will in the gas tank.

  • Anonymous
    1 decade ago

    if you got the money do it! if you can do it safe and do it right then go for it brother

  • 1 decade ago

    keep it as it is

Still have questions? Get your answers by asking now.