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Engine Power: Stealth Crate 427: Heads or Tales?

Cylinder head secrets by Pro Stock engine guru Pat Topolinski unlocks the potential of a big block Chevy crate motor.

(COURTNEY)>> OUR BLOCK OFALL NEW POWERNATION TECH

CONTINUES NOW WITH ANEPISODE OF ENGINE POWER.

(MIKE)>> LUCKILY YEAH,EVERY ONCE IN A WHILE.

(PAT)>> SOMETHING LIKETHIS, THESE ARE FEW AND

FAR BETWEEN, ESPECIALLYIF SOMETHING'S

NOT WRONG WITH IT.

(MIKE)>> I HOPETHIS ONE WORKS OUT.

(PAT)>> NO, THISLOOKS TO BE GOOD.

EVERYTHING ELSE IS GOODTO THIS POINT, WHY

WOULDN'T THIS ONE BE?

(MIKE)>> WE'RE BACK INYOUR LIVING ROOM AGAIN,

WELCOME TO ENGINE POWER.

(PAT)>> THERE'S NOTHINGQUITE LIKE SEEING A BIG

BLOCK FIRE UP ON THE DYNO.

THIS Z-Z- 427 FROM CHEVYPERFORMANCE IS ONE OF

THOUSANDS PRODUCED THATMAKES 480 HORSEPOWER.

NOW WE PICKED THISONE UP USED AT A SWAP

MEET FOR $3,500 BUCKS.

NOW SO FAR IT CHECKS OUTOKAY BUT WE'RE NOT GONNA

KNOW UNTIL WE FIRE IT UP.

(MIKE)>> NOW THEY CAMEWITH A GREAT WARRANTY AND

AWESOME PERFORMANCE RIGHTOUT OF THE BOX, BUT THAT

ALSO MEANS CONSERVATIVESTEPS WERE TAKEN ON THE

ORIGINAL PART SELECTION.

NOW WE WANT TO PULL EVERYBIT OF HORSEPOWER WE CAN

OUT OF THIS ENGINE.

SO SOME CHANGES NEED TO BEMADE, LIKE THE CAM SHAFT,

BUMPING UP THECOMPRESSION, AND CHANGING

THE AIR FLOW CHARACTERISTICSOF THESE HEADS.

NOW FOR THAT WE'RE GONNASHOW YOU AN EASY WAY

TO PORT THEM AT HOME.

NOW IT'S EVENTUALLY GONNAFIND ITS WAY BETWEEN THE

FRAME RAILS OF A WICKEDLITTLE S-10 PROJECT

WE HAVE PLANNED.

FOR NOW WE NEED TO SEE HOWWELL WE SPENT OUR MONEY.

(PAT)>> WE'RE TESTING ITTHE SAME AS THE BOW TIE

BOYS DID WITH A 770 C-F-MCARB, PREMIUM FUEL, AND

WITH THE HAT IN PLACEWE'LL LIGHT IT OFF.

[ engine firing ]

(PAT)>> CRITICAL THINGS TOLOOK FOR ON INITIAL FIRE

UP IS SUFFICIENT OILPRESSURE, NO EXTERNAL LEAKS,

AND OBVIOUSLY NOAUDIBLE WARNING SIGNS.

THE TIMING IS SIMPLE.

10 DEGREES OF BASETIMING AT IDLE.

26 DEGREES OF CENTRIFUGALADVANCE IS BUILT INTO THE

DISTRIBUTOR, AND THATWILL GIVE US A TOTAL OF

36 DEGREES, EXACTLYWHAT CHEVY SPECIFIES.

SINCE EVERYTHING STILLLOOKS GOOD AT OPERATING

TEMPERATURE, WE'VEGOT THE GREEN LIGHT

TO FLOG THIS RAT.

(MIKE)>> ACTIVATED!

(PAT)>> ALRIGHT, LETSSEE WHAT OUR MONEY

BOUGHT US HERE.

(MIKE)>> HERE WE GO.

(PAT)>> FROM 3,000TO 6,000 R-P-M.

[ engine revving ]

(MIKE)>> 468, 475.

(PAT)>> ACTUALLYI'M VERY HAPPY.

(MIKE)>> PLUGS ARE CLEANEDOFF NOW, LETS BACK THAT UP.

469, 486, SMOKING,SMOKING GOOD.

(PAT)>> THERE COULDBE BIRD'S NESTS, DIRT

DAUBERS, THERE COULD BEANYTHING INSIDE THAT THING.

WE HAVE NO IDEAWHAT'S IN THERE.

(MIKE)>> THERE'S ONLY ONEWAY TO FIND OUT AND THAT'S

WHAT WE'RE GONNA DO.

(PAT)>> TO THEOPERATING ROOM.

(MIKE)>> ON THE WAY.

THIS TEAR DOWN IS NOTGOING TO BE A THRASH TO

SEE HOW FAST WECAN GET IT APART.

NOW THIS ENGINE MADEAWESOME POWER BACK ON THE

DYNO, WHICH TELLSUS THERE WILL BE

MINIMAL WEAR IF ANY.

NOW WE'RE GONNA INSPECTSEVERAL COMPONENTS, TAKE

MEASUREMENTS, AND EVENLAY EVERYTHING OUT IN

ORDER AS IT'S REMOVED.

PLUS WE'LL SHOW YOU SIDEBY SIDE COMPARISONS OF THE

PARTS COMING OUT VERSUSTHE NEW PARTS WE'RE GONNA

PUT IN IT JUSTSO IT'S EASY FOR

YOU TO FOLLOW ALONG.

THE DISTRIBUTOR ISAN H-E-I, WHICH IS

A ONE WIRE HOOK UP.

NOW THIS THING HAS AREALLY LARGE CAP BUT IT

ELIMINATES THE NEEDFOR AN IGNITION BOX

OR EXTERNAL COIL.

CHEVY EQUIPS THIS ENGINEWITH A DUAL PLANE ALUMINUM

INTAKE MANIFOLD SETUP FOR A 4150 FLANGE.

NOW THEY ALSO CAST A HALFINCH RELIEF HERE IN THE

MANIFOLD'S DIVIDER, ANDTHAT ALLOWS THE CARBURETOR

TO SEE SIGNAL FROMALL EIGHT CYLINDERS.

THE VALVE COVERS HAVEA TALL PROFILE TO CLEAR

ROLLER VALVETRAIN.

AND THE FACTORY SCRIPT ISPROOF POSITIVE THIS IS

OUR STEALTH 427 PROJECT.

THE FACTORY ROCKER ARMSLOOK TO BE IN GOOD SHAPE,

BUT WE'RE NOTTAKING ANY CHANCES.

NOW HERE'S A QUICK TIP.

WHEN REMOVING ROCKER ARMS,ALWAYS DO THEM IN PAIRS

WHEN THERE IS NO SPRINGPRESSURE ON THEM.

THIS WILL ELIMINATE THECHANCE OF STRIPPING OR

GALLING ANY THREADS ONYOUR POLY LOCKS OR STUDS.

(PAT)>> LUNATI SUPPLIED USWITH THEIR BEEFIER VOODOO

SERIES ROCK ARMS THAT HAVEA ONE-SEVEN RATIO AND

A SINISTER BLACKANODIZED FINISH.

THIS AREA WAS DESIGNEDWITH EXTRA CLEARANCE FOR

HIGHER LIFT ANDBIGGER SPRINGS.

PLUS THE PRECISION SORTEDTRUNION NEEDLE BEARINGS

WITHSTAND HIGHER PRESSURESFOR BETTER LONGEVITY.

(MIKE)>> BACK AT THERAT THE PUSHRODS ARE

THREE-EIGHTHS OF ANINCH IN DIAMETER AND

A ONE PIECE DESIGN.

NOW THERE'S A SLIGHTCHANCE WE MAY BE ABLE TO

REUSE THEM WHEN WE PUT THEENGINE BACK TOGETHER, AND

THAT'S DUE TO IT BEING AHYDRAULIC ROLLER SETUP.

NOW BECAUSE OF OUR NEWCAM SHAFT HAVING SUCH AN

AGGRESSIVE PROFILE,THAT IS GONNA

BE THE DECIDING FACTOR.

AT THIS TIME, NO BIRD EGGSOR ANY EVIDENCE OF WILD

LIFE, BUT WE STILLHAVE A WAYS TO GO.

WE'LL BE RIGHT BACK.

(ANNOUNCER)>> THEINVESTIGATION CONTINUES

AND HOW TO DETERMINECOMPRESSION RATIOS.

(MIKE)>> THAT VALLEYLOOKS REALLY CLEAN.

(PAT)>> YEAH, THAT'SA GOOD INDICATION.

(MIKE)>> EVEN THE CAM LOBESLOOKS GOOD FROM HERE.

(PAT)>> YEP,YEP, SURE DOES.

(MIKE)>> BACK IN THE SHOPTHE TEAR DOWN CONTINUES.

NOW THE DEEPER WE GET THEMORE ANXIOUS WE ARE TO

SEE THE FINAL OUTCOME.

WE STILL HAVE A WAYS TOGO BEFORE THAT HAPPENS.

TO GAIN ACCESS TOSEVERAL HEAD BOLTS THE

SEVEN-SIXTEENTHS OF ANINCH ROCKER ARM STUDS NEED

TO GO, FOLLOWED BYTHE GUIDE PLATES.

NOW THEY'RE ON THE LISTFOR ITEMS WE'RE REUSING,

SO ON THE TRAYIN ORDER THEY GO.

SINCE THIS ENGINE HAS SOMERUN TIME ON IT, THERE'S A

SIMPLE RULE OF THUMB FORTAKING OUT THE HEAD BOLTS.

IT'S IN THE REVERSEORDER OF HOW THE

HEAD WAS INSTALLED.

THIS PRACTICE ENSURES NOHEAD WARPAGE WHETHER THE

ENGINE IS HOT OR COLD.

CRACKING THE EGG.

(PAT)>> OH, THATWENT OFF NICE.

(MIKE)>> MAN THISTHING HARDLY HAS

ANY RUN TIME ON IT.

TOP OF THE PISTON'S CLEAN,CROSS HATCH IS STILL GOOD

IN THE CYLINDER,LOOKS GOOD.

LET'S SEE WHAT THEOTHER SIDE DOES.

MAYBE CLEANER!

(PAT)>> IT LOOKS GREAT.

(MIKE)>> WHAT WE'RE HOPINGTO SEE IS A GASKET THAT

LOOKS UNIFORM ANDFREE OF DARK SPOTS.

IF THOSE ARE PRESENT,IT'S A SIGN OF COMPRESSION

LEAKAGE AND A MAJORCONTRIBUTOR TO POWER LOSS.

(PAT)>> SO SAVE OVER $500BUCKS WHEN WE PUT IT BACK

TOGETHER WE'RE GONNA REUSETHE TIE BAR LIFTERS SINCE

THE ENGINE WASN'TRAN THAT MUCH.

THIS IS WHERE OURFIRST MEASUREMENT

COMES INTO PLAY.

WE WANT TO KNOW THE EXACTTHICKNESS OF THE GASKET

BECAUSE WE'LL BE USINGTHAT INFORMATION TO HELP

DETERMINE OUR COMPRESSIONRATIO, WHICH WE'LL SHOW

YOU HOW TO DO LATER ON.

FEL PRO ADVERTISEDTHIS ONE TO HAVE A

39 THOUSANDTHSCOMPRESSED THICKNESS.

USING A MICROMETER TO GETAN ACCURATE READING, IT

MEASURES RIGHT AT39 THOUSANDTHS.

(MIKE)>> USING A BRIDGEAND DIAL INDICATOR ON THE

DECK, WE WANT TO SEE IFTHE PISTON IS PROTRUDING,

EVEN, OR RECESSEDIN THE CYLINDER.

THIS MEASUREMENT MUSTBE TAKEN SINCE IT'S AN

IMPORTANT FACTORIN THE COMPRESSION

RATIO CALCULATION.

WHEN THE DIAL REACHES ITSSTOPPING POINT, THE PISTON

IS AT ITS HIGHEST POINT,WHICH IS TRUE T-D-C.

NOW WE'LL ROCK THE PISTONIN THE BORE AND FIND

THE SPLIT BETWEENTHOSE TWO NUMBERS

MEASURED AT THE EDGE.

THIS IS WHERE THE PISTONFLATS ARE LEVEL, AND THIS

WILL BE THE ADDITIONALDATA NEEDED FOR OUR

FORMULA, CALLEDDECK HEIGHT.

WITH THE PISTON AND RODASSEMBLY STILL IN THE

BLOCK, WE NEED TO KNOWEXACTLY HOW MUCH VOLUME

THE DOME OF THE PISTONTAKES UP IN THE CYLINDER.

NOW SINCE WE'RE KEEPINGTHESE PISTONS IN SERVICE,

FINDING THAT EFFECTIVEDOME VOLUME WILL GET US

ONE STEP CLOSER TO THEEQUATION, AND LET US KNOW

WHAT OTHER AREAS WECAN ADJUST TO REACH OUR

TARGETED COMPRESSIONRATIO OF 10.75 TO ONE.

(PAT)>> RUNNING THE PISTONABOUT HALF WAY DOWN THE

BORE IS ENOUGH TO PUTSOME ASSEMBLY GREASE

IN THE CYLINDER.

THEN RUN THE PISTONBACK UP TO EXACTLY ONE

INCH FROM THE DECK.

THE GREASE'S JOB IS TOSEAL THE RINGS SO NO FLUID

CAN BYPASS THEM, MAKINGSURE TO REMOVE AS MUCH

EXCESS AS POSSIBLESO IT DOES NOT

TAKE UP FLUID VOLUME.

NOW APPLY A SMALL RING OFGREASE AROUND THE BORE TO

SEAL IT TO THE CLEARPLATE, AND POUR COLORED

ALCOHOL IN USING ABARRETTE TO PRECISELY

MEASURE THE AMOUNT USED.

FACTORING IN THATTINY BUBBLE IS 197.

BUT WE'RE NOT DONE YET.

WE NEED MORE TOFIGURE THIS VOLUME.

POINTSEVEN-EIGHT-FIVE-FOUR IS A

DERIVATIVE OF PI, WHICHSHORTENS THE EQUATION.

MULTIPLY IT BY THE BORETIMES THE BORE AGAIN TIMES

ONE, WHICH IS WHERE WE PUTTHE PISTON IN THE HOLE,

TIMES 16.39 WHICH CONVERTSCUBIC INCHES TO C-C'S.

THAT EQUALS A VOLUMEOF 232.51cc'S MINUS THE

MEASURED VOLUME OF197cc'S, GIVES US THE

PISTON'S EFFECTIVEDOME VOLUME OF

35.51 POSITIVE C-C'S.

THAT'S ONE OF FIVE VOLUMESNEEDED TO FIGURE OUR

COMPRESSION RATIO.

VOLUME OF THE CYLINDER,COMBUSTION CHAMBER, HEAD

GASKET, DECK HEIGHTMEANING PISTON IN OR OUT

OF THE HOLE, AND THEEFFECTIVE DOME VOLUME

WE JUST FIGURED,35.51 POSITIVE C-C'S.

SINCE WE KNOW THE BOREAND STROKE, WE'LL USE THAT

INFORMATION AND THE SAMEFORMULA AS V-FIVE, WHICH

GIVES US 875.64 C-C'S.

WE PHYSICALLY MEASUREDTHE COMBUSTION

CHAMBER AT 113 C-C'S.

THE FEL PRO GASKET IS WORTHNINE POINT SEVEN C-C'S.

THE PISTON WAS 27THOUSANDTHS IN THE HOLE,

MEASURING ITWITH THE BRIDGE.

USING OUR FORMULAIT COMES OUT AT

SIX POINT TWO-EIGHT C-C'S.

SINCE OUR EFFECTIVE DOMEVOLUME WAS A POSITIVE

NUMBER, IT NEEDSTO BE SUBTRACTED.

IF IT WERE A DISH,IT WOULD ADD VOLUME.

NOW SUBTRACT THECYLINDER VOLUME.

OUR COMPRESSIONIS 10.37 TO ONE.

(MIKE)>> MEASURING ITYOURSELF IS THE MOST

ACCURATE WAY TO KNOWWHAT YOU'VE GOT.

NOW ADVERTISED NUMBERSARE EXACTLY THAT.

WE CAME UP WITH SLIGHTLYMORE COMPRESSION, BUT

THAT'S OKAY WITH US.

NOW IF ALL THOSE NUMBERS,OR MATH IN GENERAL,

INTIMIDATE YOU, SUMMITRACING HAS AN ONLINE

COMPRESSION CALCULATORTHAT'S EASY TO USE.

JUST GO TO THE MAINSITE, CLICK ON THE EXPERT

ADVICE AND NEWS TAB.

THEN SCROLL DOWN TOTOOLS AND CALCULATORS.

IT WORKS, WE'VE USEDIT, WE'LL SEE YOU

IN A FEW MINUTES.

COMPRESSION RATIOCALCULATION.

NOW IT'S TIME TO GETDIRTY DISASSEMBLING THE

REST OF THE ENGINE.

NOW TO THIS POINT IT'SIMPRESSED US WITH ITS

CONDITION, ESPECIALLYBECAUSE OF THE $3,500

PRICE TAG, WHICH ISUNDER HALF THE COST

OF A BRAND NEW ONE.

THE STOCK PAN IS A SIXQUART PIECE THAT HAS NO

BAFFLING, AND THIS IS THELAST TIME YOU'LL SEE IT SINCE

A NEW PAN IS IN ORDERFOR THE S-10 CHASSIS.

COMING OFF NEXT IS THEMELING HIGH VOLUME OIL PUMP.

WE'LL REUSE IT BUT GIVE ITA LITTLE MASSAGING BEFORE

IT GOES BACK ON.

WITH ACCESS WE CANREMOVE THE ROD

AND PISTON ASSEMBLIES.

THE RODS ARE A HEAVY DUTYFORGED I-BEAM DESIGN THAT

MEASURE IN AT SIX POINTFIVE-THIRTY FIVE INCHES.

THEY'RE BEING REUSED ANDSUFFICIENT FOR THE POWER

AND R-P-M WEPLAN ON RUNNING.

THIS IS THE GRAND FINALE.

(MIKE)>> GOT HER,MAN EVERYTHING LOOKS

SO GOOD ON THIS MOTOR.

THE FORGED ALUMINUMPISTONS SPORT A

SIXTEENTH-SIXTEENTH-THREE-SIXTEENTHS RING PACK THAT

WE'LL IMPROVE ON LATER ON.

PLUS THESE THINGS AREGONNA BE GOOD FOR A

LITTLE POWER ADDERWE HAVE PLANNED.

STANDARD SIZE CLEVITEBEARINGS THAT ARE UNCOATED

CAME IN THIS ENGINE.

NOW THERE'S MINIMAL WEAR,WHICH STAYS TRUE TO THE

LITTLE RUN TIMETHE TOP END SHOWED.

NOW WHEN IT GOES BACKTOGETHER, CLEVITE

TRI-ARMOR BEARINGS THATHAVE A FRICTION REDUCING

COATING WILL GIVE USADDITIONAL PROTECTION ON

DRY START UPS AND THEADDED STRESSES THE ENGINE

WILL SEE DUE TOITS HIGHER OUTPUT.

TO GO ALONG WITH THE HEAVYDUTY RODS, A FORGED STEEL

4340 INTERNALLY BALANCEDCRANK SHAFT IS THE BACK

BONE OF THIS 427.

NOW IT USES A THREE POINTSEVEN-SIX-SIX INCH STROKE

AND OUT BACK A ONEPIECE REAR MAIN SEAL.

NOW IT'S ALL HELD INWITH FOUR BOLT MAINS.

NOW I'M GONNA GO AHEAD ANDGET THE REST OF THE SHORT

BLOCK TORE DOWN WHILE PATSHOWS YOU SOME HOME BREW

MAGIC ON THE CYLINDERHEADS AND HAS A LITTLE

FUN ON THE FLOW BENCH.

(PAT)>> SINCE WE'RE ADDINGONE HUNDRED THOUSANDTHS

LIFT TO OUR CAM, ANEW SPRING PACKAGE

IS ON THE LIST.

WE'RE KEEPING THE VALVESIN ORDER SO THEY CAN GO

BACK IN THE SAME LOCATIONSINCE THE GUIDES ARE IN

GREAT CONDITION.

THEY HAVE TWO-TWO-50INTAKE AND A

ONE-EIGHT-80 EXHAUST.

THESE HEADS AREADVERTISED TO HAVE A

290cc INTAKE RUNNER.

AND OVER HERE ONTHE EXHAUST SIDE

THEY MEASURE 110cc.

AND REMEMBER, THECOMBUSTION CHAMBER

MEASURED AT 113.

WE'RE GONNA SURFACE THEDECK TO SHALLOW UP THE

COMBUSTION CHAMBERSSO WE CAN HELP

RAISE OUR COMPRESSION.

AND I'LL SHOW YOU SOMEEASY PORT WORK THAT'LL

INCREASE SOME AIR FLOW,WHICH TRANSLATES

TO MORE HORSEPOWER.

(MIKE)>> WE MOUNTED THEHEAD TO THE FLOW BENCH.

NOW WE'LL FLOW ONE INTAKERUNNER TO GET A BASE LINE

AT SIX DIFFERENTLIFT POINTS.

ALL THE WAY TO SEVENHUNDRED THOUSANDTHS.

AT TWO HUNDRED THOUSANDTHSWE GOT 138 C-F-M.

BUMPING IT UP TO THREEHUNDRED THOUSANDTHS,

203 C-F-M.

THE NEXT THREE LIFTPOINTS ARE RIGHT IN LINE

WITH THE FACTORY SPECS.

FINALLY WE'LLOPEN THE VALVE TO

SEVEN HUNDRED THOUSANDTHS.

NOW CHECKING IT HERE ISIMPORTANT SINCE OUR

NEW CAM HAS 626THOUSANDTHS OF LIFT.

SO JUST FLOWING IT TO600 WOULDN'T BE ENOUGH.

(PAT)>> TO DO THE PORTWORK YOU'LL NEED SOME SORT

OF DIE GRINDER AND APORTING KIT LIKE THIS

AVAILABLE FROMSUMMIT RACING.

NOW IT CONTAINS ALL THECARTRIDGE ROLLS, STONES,

CROSS BUFFS, AND SHANKSYOU'LL NEED TO GET

THE JOB DONE RIGHT.

AND LAST BUT NOT LEAST, AGOOD PAIR OF SAFETY GLASSES.

I'LL START BY USING ASTONE INSIDE THE POCKET

AREA REMOVINGCASTING FLASH.

WE'RE NOT TRYING TORESHAPE ANYTHING, JUST

GIVING IT A GOOD CLEAN UPBECAUSE IN THIS SCENARIO

BIGGER WON'T BE BETTER.

IT'S IMPORTANT TO LETTHE STONE DO THE WORK.

USE LIGHT PRESSUREAND KEEP IT MOVING.

OTHERWISE IT'S EASYTO DIG TOO DEEP AND DO

MORE HARM THAN GOOD.

HERE'S A TIP, TAKEYOUR TIME, AND DON'T

NICK THE VALVE SEAT.

THAT WILL JUST COMPLICATETHINGS LATER WHEN A VALVE

JOB HAS TO BE DONE.

USING LIGHT PRESSUREALLOWED ME TO REMOVE THE

CASTING FLASH, KEEPINGTHINGS THE SAME SIZE AND

CREATING A BETTER FINISH.

I'LL START BLENDING THEREST OF THE RUNNER UP TO

THE FACTORY C-N-C WORK.

THAT'S AN AREA WE DON'TWANT TO MESS WITH.

WITH ABOUT 20 MINUTESWORTH OF WORK BEHIND US,

THE PORT PROFILE WE'RELOOKING FOR IS FINISHED.

NOTICE HOW THE CASTINGLINE IS STILL THERE?

WELL IT'S MUCHSMOOTHER, WHICH IS

EXACTLY WHAT WE WANTED.

I'M ALSO GOING TOPOLISH THE CHAMBER.

DOING THIS REFLECTS MOREHEAT, WHICH RESULTS IN A

MUCH MORE EFFICIENT BURN.

I'M USING ALUMINUM WHEELPOLISH AND SMALL PIECE

OF PIG MAT TO GETTHE MIRROR FINISH.

BEFORE PEOPLE STARTEDUSING THERMAL BARRIER

COATINGS, THIS WASNORMAL PRACTICE IN

HIGH END RACE ENGINES.

SINCE WE NOW HAVE ACOMPLETED COMBUSTION

CHAMBER AND A PORT AS ANEXAMPLE, WE'LL SHIP THESE

HEADS OFF TO THE SCHOOL OFAUTOMOTIVE MACHINISTS SO

THEY CAN COMPLETETHE PORTING.

PLUS THEY'LL DO SOMETHINGS THAT WE CAN'T DO

HERE, LIKE A PRECISIONMULTI-ANGLE VALVE JOB AND

MILLING OF THE DECKSURFACE TO REDUCE OUR

CHAMBER SIZE TO 109cc.

NOW I'M GOING TO GET THESEHEADS BOXED UP, WE'LL SEE

YOU IN A FEW MINUTES.

(ANNOUNCER)>> UP NEXT SEEHOW MUCH TENSION STOCK OIL

RINGS HAVE OVER LOWTENSION ONES

WITH A FISH SCALE.

COMPLETE AUTO CARE.

MAINTAINANCE, REPAIR, TIRES.

(MIKE)>> WE'RE BACK ANDCONTINUING ON OUR STEALTH

427 BIG BLOCK CHEVY BUILD.

NOW SINCE THE HEADS AREHEADED WEST, WE'RE GONNA

GO AHEAD AND MOVE ON.

NOW EVERY ENGINE HASFREE POWER LOCKED INSIDE.

THE GOOD NEWS IS YOU CANFREE SOME OF IT UP BY

REDUCING THEPARASITIC DRAG.

DON'T BELIEVE US, WELLWE'RE GONNA SHOW YOU HOW

MUCH TENSION A SET OFSTANDARD OIL RINGS HAS

VERSUS A LOW TENSION SET.

FIRST WE'LL SLIDE THEPISTON AND ROD ASSEMBLY

INTO THE BORE UPSIDEDOWN WITH THE

ORIGINAL RINGS INTACT.

NOW WE CAN ATTACHA FISH SCALE TO THE

BIG END OF THE ROD.

KEEPING THE PISTONSQUARE AND PULLING IT

STRAIGHT UP THE BORE.

WE CAN GET A READINGON THE SCALE.

NOW THE STANDARD RINGSREPORT 27 POUNDS, WHICH IS

THE AMOUNT OF DRAG THE OILRING TENSION IS CREATING.

SWAPPING OUT FOR A SETOF TOTAL SEAL LOW TENSION

RINGS WILL FREE UP POWERBY REDUCING PARASITIC DRAG.

WHAT'S IT WORTH?

THE SCALE SHOWS 17 POUNDS.

THAT'S A 10 POUND REDUCTIONAT EACH CYLINDER.

NOW ANY TIME YOU CAN FREEUP PARASITIC DRAG LIKE

THIS, YOU'RE NOT MAKINGHORSEPOWER, YOU'RE JUST

FREEING UP WHAT'SALREADY THERE.

NOW WE'RE NOT DONE YET.

WE STILL HAVE A COOLLITTLE TIP TO SHOW YOU

BEFORE THIS THING GOESBACK TOGETHER, AND IT

INVOLVES THE TOPOF THE PISTONS.

(PAT)>> THAT TRICKINVOLVES POLISHING THE

PISTONS JUST LIKE THECOMBUSTION CHAMBERS.

FIRST WE NEED TOTAPE UP THE AREA

WE DON'T WANT POLISHED.

USING OUR THREE QUARTERHORSEPOWER BUFFER AND A

FINE POLISHING WHEEL, WECAN APPLY WHITE ROUGE,

WHICH WILL GIVETHEM A HIGH LUSTER

MIRROR LIKE FINISH.

THE SMOOTHER AND FINERTHAT FINISH IS, THE MORE

IT RESISTS HEAT SYNC.

PLUS IT ELIMINATES ANYPOTENTIAL HOT SPOTS, WHICH

ARE A BIG CAUSEOF PRE-IGNITION.

FINALLY USE SOME MORE MAGPOLISH, ANOTHER PIECE OF

PIG MAT, AND A SCOTT BLUESHOP TOWEL, A QUICK CLEAN

UP WILL EXPOSE THEMIRROR LIKE FINISH

WE'RE LOOKING FOR.

(MIKE)>> ROYAL PURPLE'SNEW ZERO W-40 A-P-I

LICENSED HIGH PERFORMANCEMOTOR OIL COMBINES PREMIUM

BASE OILS WITH PROPRIETARYADDITIVE TECHNOLOGIES,

WHICH CREATES A BLEND THATMAXIMIZES HORSEPOWER AND

MEETS THEIR 12,000MILE PLEDGE.

NOW THAT MEANS YOU CAN GO12,000 MILES BEFORE YOUR

NEXT OIL CHANGE.

COMPARE THAT TO ACONVENTIONAL MOTOR OIL

AND YOU WOULD HAVE TODO IT FOUR TIMES.

SO THE ROYAL PURPLE NOTONLY GIVES YOU ADDED

PROTECTION, BUT ITALSO SAVES YOU MONEY

IN THE LONG RUN.

SO IF YOU'RE LOOKINGFOR MORE POWER, BETTER

PROTECTION, JUST GO DOWNTO YOUR LOCAL AUTO PART

STORE WHERE YOUCAN FIND SEVERAL

ROYAL PURPLE PRODUCTS.

(PAT)>> TO SAY A-R-P HASYOU COVERED IN THE BOLT

DEPARTMENT IS ANUNDERSTATEMENT.

THE WORLD LEADER INFASTENER TECHNOLOGY MAKES

IT EASY FOR YOU TOCOMPLETE YOUR PROJECT

WITH THEIR ENGINE ANDACCESSORY FASTENER KITS.

NOW THESE ARE AVAILABLE INSEVERAL DIFFERENT FINISHES

AND CONTAIN ALL THE NUTS,BOLTS, AND WASHERS NEEDED

TO ATTACH YOUR CHOSENCOMPONENTS CORRECTLY.

PLUS WHAT THAT MEANS, NOMORE GOING TO THE HARDWARE

STORE TO PIECE TOGETHERA BAG FULL OF STUFF,

WHICH SAVES YOUVALUABLE SHOP TIME.

(MIKE)>> DEMON HAS SET ANEW STANDARD FOR CRISP OUT

OF THE BOX PERFORMANCEWITH THEIR NEW STREET

DEMON SERIES CARBS.

NOW INNOVATIONS AREEVERYWHERE IN THIS PIECE

THAT'LL BOLT DIRECTLYIN PLACE OF ANY STOCK OR

AFTERMARKET FOUR BARREL.

NOW THE AEROSPACECOMPOSITE FUEL BOWL AND

MAIN BODY HELPS ELIMINATELEAK PASS AND KEEPS FUEL

UP TO 20 DEGREES COOLER.

NOW IT'S AVAILABLE IN A625 AND 750 C-F-M VERSION

FROM SUMMIT RACING.

NOW ON THE NEXT EPISODEWE'LL HAVE OUR MASSAGED

CYLINDER HEADS BACKFROM SAM AND WE'LL BE

ASSEMBLING OUR STEALTH427 AND STRAPPING

IT ON THE DYNO.

AND WE CAN'T WAITTO SEE THE RESULTS,

WE'LL SEE YOU THEN.

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