427CI TWIN-TURBO LS EN­GINE

> MPW PER­FOR­MANCE, DAN­DE­NONG

Street Machine - - Mill Of The Month - STORY SCOTT TAY­LOR PHO­TOS NATHAN JA­COBS

AC­TIONS speak louder than words in the per­for­mance scene. Adam Ro­gash from MPW Per­for­mance knows this bet­ter than most, which is why he’s built his own seven-sec­ond street ma­chine, an HSV VT Club­sport called NOSHOW. And here’s the en­gine.

At the heart of the pack­age is a Dart LS Next block that they’ve built with the help of Johnny Pilla at Pow­er­house En­gines. Adam likes the LS Next with its thicker bores, pri­or­ity oil­ing and splayed main cap de­sign, rather than try­ing to con­tain all that grunt within a fac­tory block. It mea­sures up at 427ci thanks to a bul­let­proof combo fea­tur­ing a Lu­nati Sig­na­ture Se­ries crank, Cal­lies Ul­tra H-beam rods and JE pis­tons, and the whole she­bang is topped by a pair of Johnny’s own LS Power Heads. They’re six-bolt items based on an LS3 rec­tan­gu­lar-port de­sign; they start as blanks and then Johnny ports and ma­chines them to his own spec­i­fi­ca­tions. Fill­ing the gap be­tween them is a Hol­ley Hi-ram EFI in­take with a 90mm throt­tle­body.

It’s a solid pack­age, but as with any en­gine it’s all about air­flow, and the twin Tur­bo­net­ics 69mm tur­bos pro­vide plenty of that. They hang off a pair of cus­tom four-into-one steampipe man­i­folds, which were fab­ri­cated in-house at MPW, and there’s a pair of Tur­bosmart 45mm waste­gates to keep the boost un­der con­trol.

At just un­der 24psi, the en­gine maxed out its in­jec­tors and pro­duced 1615hp on Pow­er­house’s en­gine dyno, run­ning pump E85 and a Hal­tech Elite ECU.

It’s a stout com­bi­na­tion by any­one’s mea­sure, and sur­pris­ingly streetable. The guys fin­ished third over­all at Street Ma­chine Drag Chal­lenge 2015 with­out a prob­lem, and man­aged a 7.99@171mph on the last day of com­pe­ti­tion.

“We’re go­ing to switch to methanol for the strip and turn this thing up,” Adam reck­ons. “The aim is to get it into the mid-sev­ensec­ond zone. Even­tu­ally we’ll look at step­ping up the tur­bos, but es­sen­tially it’s still a street car, so for what we’re do­ing, it’s per­fect.”

BE­LOW: The en­gine was a col­lab­o­ra­tive ef­fort be­tween MPW Per­for­mance and Pow­er­house En­gines; both com­pa­nies bring years of ex­pe­ri­ence to the ta­ble. They’re look­ing to step things up, but at the mo­ment the Bosch 2200cc in­jec­tors are tapped out

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