Page 124 of 2009 Performance Parts by GM Parts Direct

chevy big-block v-8 drce pro stock cylinder heads gmperformancepartsdrcedragracingcompetitionengine prostockcylinderheadsarethechoiceofnhraprostock champions,soyouknowthesearethebestheadsavailable.when races are won by thousandths of a second there s no room for second-bestparts.thegmperformancepartsdrcealuminum cylinderheadswerespecificallydesignedforthedrce2engine blockp/n24502572andintendedfornhradragracingprostock competition applications special features of these heads include high-capacity water jackets symmetrical-port layout ample wall material for custom porting,thickdecksurfaces7/8 tofacilitateanglemillingand reducedweightcastingtominimizecnc-machiningtime.atypical cnc-preppedcylinderheadwithoutvalvesorvalvetrainweighs approximately40pounds drce pro stock heads continued b 25534404 drce 3 aluminum cylinder head casting · rawaluminumcasting,notmachined · newestdesigndrce rockerarmmountingpads andvalvespringseatpadsallowgreaterflexibility withvalveanglesandlocationsthandrce2 · madetoworkondrce3blockanddrce2 p/n24502572 chevy big-block v-8 25534387 drce 3 water jacket plug not shown · · · · drce 3 aluminum cylinder head casting exhaust b forendsofdrce3cylinderheadcastingp/n25534404 aluminuman-16withinternalhexforallenwrench includeso-ring soldindividually;use2perhead drce pro stock race cylinder head technical notes · t355-t7maluminumconstruction · complieswithnhraprostock500-cid,4.900 bore spacing rules · symmetricalintakeportlayout · intakeandexhaustportsareextremelysmall peanutports · 7/8 thickdecksallowforanglemillingorheavyflatmilling · requiresprofessionalportingandmachining · high-capacityself-purgingwaterjackets · customaftermarketrockerarmassembliesrequired 25534388 drce 3 water jacket plug not shown a drce 2 raw aluminum cylinder head exhaust · forwaterjacketaccessholesofdrce3cylinderhead castingp/n25534404 · aluminuman-08withinternalhexforallenwrench · includeso-ring · soldindividually;use8perhead 1988 camaro 1le a 24502585 drce 2 raw aluminum cylinder head · rawaluminumcasting,notmachined · accommodates10°­14°x5°intakeand5°­9°x2.5° exhaust valve angles · madetoworkondrce2blockp/n24502572 drce 3 aluminum cylinder head casting intake b 1985 camaro iroc-z when camaro engineers learned that the camaro was in need of more braking to run competitively in the sports car club of america s emerging showroom stock class they began by looking into larger brakes and finished by homologating a complete package thus was born the infamous 1le option a drce 2 raw aluminum cylinder head intake born to celebrate the camaro z28 s selection as the race car of choice for the international race of champions this race car tribute took the handling of the previous z28 deeper into the corner with a lower center of gravity specially valved springs and shocks and 16 aluminum wheels with goodyear gatorbacks the iroc z was good for 0.92g on the skidpad irocs weren t all about the handling though as the top-dog 305-cube small-block pumped out 215 horsepower and 275 lb-ft of torque through a four-speed automatic transmission if you wanted a manual transmission you had to step back to a 190-hp carbureted 305 choosing the fuel-injected automatic combo netted the then-new tuned port injection tpi which featured a dual-bore throttle body and long torque-producing runners from the lt1 engines that followed to the ls7 crate engine found in this catalog the induction concept pioneered on the tpi lives today drce 3 aluminum cylinder head casting combustion chamber b a best-kept secret when introduced a 1le wasn t a simple order you had to begin by ordering the g92 performance axle which featured a limited-slip diff by ordering g92 and no air you headed full speed into turn one with two-piston pbr brakes an aluminum driveshaft a baffled fuel tank and few creature comforts only four racers in the know snatched up 1le camaros that first year but the package would continue on for 11 years it didn t take long for racers packing the 1le to dominate the scca escort endurance championship in 1989 cylinder heads additional required components part number 12562920 12562926 12562925 12363390 12363392 12363399 88961160 12499255 gaskets quantity 140970012or125557282 140970012or125557282 140970012or125557282 123634112 125557282 125557282 889615612 889615612 bolts quantity 1014120424 101412058 1014120424 101412058 1014120424 101412058 123677791kit 1255572816 889603348 8896033316 889603348 8896033316 889603348 8896033316 889603348 spark plug 5613438 5613438 5613438 19145286 19145286 19145286 5613100 5613878 engine application 24502620,12568778,24502618,12568774 24502620,12568778,24502618,12568774 24502620,12568778,24502618,12568774 12499121,12496962,12371204,12497323,12496963,12371171 12498777 12498777 12498827,12498826 12498792 a drce 2 raw aluminum cylinder head combustion chamber 244 buy online at www.gmperformanceparts.com available for purchase online at gmperformanceparts.com 245

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