454 Chevelle Corvette Engine Xch Suffix Code Ls7 (big Brother To Ls6 L88 & Zl1) on 2040-parts.com

AS STATED BY WIKIPEDIA:

"The Big-Block was expanded again, for 1970, to 453.96 cubic inches (7.4 L), with a 4.250 in (108.0 mm) bore and 4 in (100 mm) stroke. The 1970 Chevrolet Corvette LS5 version of this engine was factory-rated at 390 hp (291 kW) and 500 lb·ft (680 N·m), and the LS6 engine was rated at 450 hp (340 kW). It has been suggested that the LS6 was substantially underrated from the factory, which was somewhat common practice by the American car makers, and that the engine actually produced well over 500 horsepower (370 kW) as delivered from the factory. An even more powerful version, producing 465 hp (347 kW) and 610 lb·ft (830 N·m), of the 454, then dubbed LS7 (not to be confused with the modern, mid 2000s, 7-litre Chevrolet Corvette engine that powered the C6 Z06), was also developed. Several LS7 intake manifolds were individually produced and sold to the general public by a few Chevrolet dealers as optional performance parts. The LS7 was later offered as a crate engine from Chevrolet Performance with an officially rated power minimum of 500 Gross HP. The 1969 ZL1 version of the 427 engine was developed primarily for Can-Am racing, where it was very successful in cars like the McLaren M8B. The ZL1 had specifications nearly identical to the production L88 version of the 427, but featured an all-aluminum cylinder block in addition to aluminum cylinder heads, which dropped total engine weight into small-block Chevrolet territory (approx. 575 lb or 261 kg dressed).^{[citation needed]} The engine was also fitted with the new open combustion chamber cylinder heads, a light weight aluminum water pump, a camshaft that was slightly "hotter" than the L88's, and a specially tuned aluminum intake manifold.

The big news for the Corvette in 1970 was Chevrolet's new 454 V8 that replaced the power-plant pavement pounding 427s. 1970 sales fell to nearly half, due to the result of a strike at General Motors. A “cheese-grater” grille insert and front fender vents marked the ’70 ‘Vette. The top power-plant option for the ’70 Corvette went to the 454 LS5 rated at 390 hp. Base prices rose to $5,192 for the Coupe and $4,849 for the ragtop, with 17,316 produced.Only one Corvette with the LS7 (454-cid/465-hp) option was built. GM's policies against ultra-high performance cars at this time led to the option being stopped. The LS7 option is listed in some early 1970 sales literature but none were ever sold."

"The 450hp LS6 is one of the great muscle car engines of all time and that motor paired with the classic looks of a 1970 Chevelle make up one of the great “one-two” combos of the muscle car era. The LS7 is an even more rare and mean beast. Slated as a production engine but never produced, the LS7 was only offered as a crate engine and it was rated at 500hp. That 500hp is impressive but the fact that the engine made more than 600 lb/ft of torque made it a super shredder. These are two of the coolest Rat motors ever to roll down an assembly line." Cited: Bangshift

454  ENGINE I AM OFFERING FOR SALE:

  OK GUYS. HERE IS YOUR CHANCE TO OWN A PIECE OF HISTORY.  WHAT I AM OFFERING IS A REAL GM RPO  "LS7" ENGINE WITH  GENUINE SUFFIX STAMPING XCH STAMPED BY GM AND RATED BY GM AT 460HP-500HP, DEPENDING ON INTAKE AND CARBURETOR. THIS WAS IN THE EARLY 1970'S GM'S NEXT PROGRESSION FROM THE LS5 AND LS6 TO INCREASE POWER OUTPUT. THIS WAS A CONSERVATIVE ESTIMATE. DYNO TESTS HAVE PROVEN THIS ENGINE IS CAPABLE OF OVER 600HP WITH VERY LITTLE MODIFICATION WHILE RETAINING THE RARE VINTAGE ANTIQUE IDENTITY. OUT OF THE CRATE WITH A STOCK LS6 INTAKE AND CARB, THEY WERE MORE LIKE 550HP. THIS IS VERY IMPRESSIVE CONSIDERING A FACTORY GM ENGINE AND ONLY 454 CUBIC INCH! WITH SOME OTHER MODS AS SHOWN BELOW WITH DYNO VIDEOS, THE LS7 CAN PUT DOWN WELL OVER 600HP! THE LS7 ENGINE I AM NOW OFFERING FOR SALE WAS DISCONTINUED BY GM DECADES AGO AND ONE OF THE RAREST OR HARD TO FIND ENGINES OF OUR MODERN TIME--AGAIN HERE IS YOUR CHANCE TO OWN A PIECE OF HISTORY THAT IS BOUND TO CONTINUE TO INCREASE IN RESALE VALUE. DO NOT BUY SOME GENERIC BIG BLOCK ENGINE THAT WILL CONTINUE TO DECREASE IN VALUE--THIS ENGINE SHOULD BE CONSIDERED AN INVESTMENT!

HISTORY OF THE VINTAGE LS7 BIG BLOCK :
THIS ENGINE WAS SLATED BY GM AROUND THE TIME OF 1970 TO BE THE BIG BROTHER (MORE POWERFUL) TO THE LS6 454 450HP ENGINE OFFERED FOR THE 1970 CHEVELLE, AND AN UPGRADE TO THE ZL1 AND L88 CORVETTE AND CAMARO ENGINES. THIS "BIG BROTHER" TO EVEN THE HIGHEST RATED GM CHEVROLET ENGINES: L88, ZL1, AND LS6, THE LS7 INCLUDED:  HIGHER COMPRESSION RATIO FORGED PISTONS, 4-BOLT MAIN ENGINE BLOCK, FORGED STEEL CROSS-DRILLED CRANKSHAFT, 4340 FORGED CONNECTING RODS WITH LARGER 7/16 ROD BOLTS, ZL1 CAMSHAFT AND VALVE TRAIN, OPEN CHAMBER HIGH FLOW RECTANGULAR PORT CYLINDER HEADS WITH SPECIAL VALVE SPRINGS AND RETAINERS AND SPECIAL SWIRL POLISHED VALVES. THIS IS THE ONLY GM ASSEMBLED ENGINE PACKAGE THAT EVER CAME FROM GM WITH THE ZL1 CAMSHAFT AND VALVE TRAIN PACKAGE FROM THE FACTORY--BESIDES THE ZL1 ITSELF OF COURSE. HOWEVER THIS TIME GM CHOSE TO INSTALL THE PROVEN ZL1 CAM IN AN EVEN LARGER 454 CI ENGINE VS THE SMALLER 427CI ZL1.  HOW AWESOME IS THAT!

DUE TO HIGHER GAS PRICES, INSURANCE CONCERNS, AND UPCOMING NEW SMOG AND UNLEADED FUEL MANDATES, GM CHANGED THE PLAN TO OFFER THE LS7 AS A PRODUCTION ENGINE AND WAS BASICALLY FORCED TO ONLY OFFER THE LS7 AS AN OVER THE COUNTER ENGINE. HOWEVER, IT HAS BEEN SAID THAT THERE WERE SOME CHEVELLE AND/OR CORVETTE TEST CARS THAT RAN AROUND THE GM PROVING GROUNDS WITH THE LS7 ENGINE. THE LS7 WAS ALSO USED BY ENTHUSIASTS IN THE EARLY 1970'S AND 1980'S AS AN UPGRADE TO THERE LS6 CAR OR OTHER HIGH HORSE FACTORY RACE CARS TO GAIN A FASTER TIME AT THE DRAG STRIP AND MAKE THEIR CAR FASTER! THIS LS7 ENGINE WAS EQUIPPED BY GM WITH THE FAMOUS ZL1 SOLID LIFTER CAMSHAFT PART NUMBER 3959180 AND IS CONSIDERED THE KING OF THE HILL VINTAGE BIG BLOCK OF THE MUSCLE CAR ERA. THIS IS A FAIR STATEMENT CONSIDERING THIS IS THE HIGHEST  POWER RATED ENGINE GM EVER OFFERED FROM THIS ERA!


WHAT IS INCLUDED FOR THE BUY IT NOW PRICE:
FULL LONG BLOCK ENGINE FROM VALVE COVERS TO PAN--BLOCK AND HEADS DATE CODED TO EACH OTHER #S MATCHING--BLOCK STAMPED BY GM ENGINE SUFFIX XCH. GM FACTORY OIL PAN AND BALANCER AND VALVE TRAIN. THIS ENGINE IS READY TO INSTALL IN YOUR CAR.  I RECENTLY PULLED THIS ENGINE FROM MY PERSONAL CAR AND HAD BEEN RUNNING IT ON 93 OCTANE PUMP FUEL WITHOUT PROBLEMS FOR CRUISING AROUND TOWN ETC--I WOULD RECOMMEND BLENDING RACE GAS OR OCTANE BOOSTER IF YOU INTEND TO RACE THIS ENGINE DEPENDING ON THE AMOUNT OF IGNITION TIMING YOU RUN. I HAVE NEVER RACED THIS ENGINE AT THE TRACK, ONLY ROMPED ON IT A LITTLE FOR FUN. CAR WAS DRIVEN EVER SO OFTEN ON THE WEEKENDS IN GOOD WEATHER OR EVERY SO OFTEN TO THE SHOP FOR OIL CHANGE OR MAINTENANCE.  REMOVED FROM GARAGE KEPT RESTORED VERY NICE CAR. ENGINE RUNS GREAT AND IS VERY FAST AS YOU CAN IMAGINE. I WOULD BE WILLING TO OFFER THE ENGINE TURN KEY WITH INTAKE, CARB, FUEL PUMP, AND IGNITION AT AN UPCHARGE.

I OWN A FULL ENGINE MACHINE SHOP AND DYNO TEST FACILITY SO I CAN OFFER THIS ENGINE IN ANY LEVEL OF COMPLETENESS YOU MAY WANT. I CAN ALSO INSTALL THIS ENGINE IN YOUR CAR OR DYNO TEST IT FOR YOU FOR AN ADDITIONAL UPGRADE CHARGE. THIS ENGINE WOULD BE GREAT FOR ANY STREET OR STRIP CAR, OR MUSCLE CAR.  IF YOU CHECK YOUTUBE, YOU WILL SEE THE LS7 454 IT IS A VERY POPULAR ENGINE PACKAGE FOR 1970 CHEVELLE AS AN UPGRADE TO LS6 WITHOUT CAUSING A DRASTIC DEVALUING OF THE CAR. ALSO, THIS ENGINE WOULD BE A GREAT CHOICE FOR A CORVETTE OWNER WHO WANTS TO BUILD AN LS7 CORVETTE. THESE EARLY BIG BLOCK CORVETTES WITH LS7 ENGINES INSTALLED AND BUILT TO BIG BLOCK OR L88 SPEC ARE HIGHLY VALUABLE WITH LS7 ENGINE. FURTHERMORE, THIS BIG BLOCK LS7 ENGINE IS A GOOD INVESTMENT FOR MANY CHEVELLE BIG BLOCK CARS OR CHEVELLES BEING BUILT AS BIG BLOCK CARS. IF YOU OWN A CHEVELLE OR CORVETTE OR OTHER GM VINTAGE MUSCLE CAR AND IT NO LONGER HAS ORIGINAL ENGINE OR YOU WANT TO UPGRADE THE POWER OUTPUT OF YOUR ENGINE, THIS IS LIKELY ONE OF YOUR BEST CHOICES FOR RESALE VALUE AND/OR TO RAISE THE VALUE OF YOUR CAR.

YOUTUBE VIDEOS TO HEAR LS7 ENGINE RUN AND HOW POWERFUL THEY ARE:

https://www.youtube.com/watch?v=2Kl-NUdIbx4

https://www.youtube.com/watch?v=gXvN3z7IRp0

https://www.youtube.com/watch?v=Zck-KxOs_24

https://www.youtube.com/watch?v=n7E6ZAYKyYc

https://www.youtube.com/watch?v=6LUnvEmeb98

FROM MIKE OF TEAM CHEVELLE:
"The HP rating of the LS7 was 465. Like other High perfs of the era this was under rated and reports say that the LS7 would dyno at around 550 HP. I have never seen torque ratings published. The LS7 has the ZL1 cam, swirl polished valves, open chamber heads, etc. 12.25 compression. One sure way to identify this as a LS7 is to look on the smalled milled area in the center of the block right behind the water pump. You should find the letters XCH stamped there.  This engine is pretty radical but will idle fine at 900 rpm but the power brakes like 1000 rpm idle.  Enjoy."

CALL JERRY AT (785) 408-2911 OR MESSAGE THROUGH E-MAY WITH QUESTIONS.  I WOULD ALSO BE WILLING TO OFFER THIS ENGINE IN A VEHICLE FOR A POTENTIAL BUYER WHO MAY BE IN THE MARKET FOR NOT ONLY A LS6 OR LS7 ENGINE BUT ALSO A CAR.  STARTING PRICE FOR A NICE CORVETTE OR CHEVELLE OR OTHER WITH THIS ENGINE INSTALLED WOULD START AT $25K.

EBAY LISTING IS FOR THE ENGINE ONLY, NOT THE CAR!