Brodix/Lunati Cam Combo - Top-End Swap, Version 2

We changed out the cam in our Brodix/Lunati combo and got more respectable numbers.

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Back in the February '11 issue, we upgraded a GM Performance Parts 330hp crate motor with a Brodix Top End Kit and valvetrain stuff from Lunati. When we got all the parts installed and ran the engine on the dyno, the results were lackluster to say the least. We only added 27 hp and 11 lb-ft to the crate motor's baseline. Those numbers were not enough to justify the money or work that was invested. We realized our cam choice was not right to support the parts we had, so we picked up a different cam and stuffed it in.

Speed-O-Motive was our first dyno place, but we relocated to Vrbancic Bros. Racing, which is much closer to our shop. Both places use the same DTS model dyno with the same correction parameters, so the differences between the two facilities were minimal. As a footnote, the Vrbancic brothers also own The Carb Shop, which happens to be right next door to the dyno, but they only have one website, which is directed to The Carb Shop.

The new cam (after a bit of tuning from Bob and George Vrbancic) produced more respectable numbers, and here is how it all went down. We'll give you a small refresher on the previous story, but you should go to www.superchevy.com and check out the entire article.

Stock GMPP Crate Motor

RPMHPTQ
3500239359
3600252367
3700261371
3800269372
3900276372
4000284373
4100290372
4200295368
4300299366
4400305364
4500311363
4600316361
4700319357
4800323353
4900326349
5000331347
5100330340
5200335338
5300332329
5400332324
5500331316

Top-End Swap V1

RPMHPTQ
3500248373
3600261381
3700268381
3800278384
3900284383
4000291383
4100294377
4200300375
4300301368
4400306365
4500310362
4600317362
4700324363
4800330361
4900338362
5000343360
5100346356
5200349352
5300350347
5400352342
5500356340
5600355333
5700359331
5800359325
5900359320
6000362316

Top-End Swap V2.0, No Spacer

RPMHPTQ
3500271406
3600280409
3700287407
3800294406
3900299403
4000304400
4100311398
4200317397
4300325397
4400333398
4500342400
4600350399
4700358400
4800364398
4900367394
5000371389
5100373384
5200376380
5300380377
5400385375
5500391373
5600394370
5700399368
5800404366
5900406362
6000410359

Top-End Swap V2.2, 1-inch Open Spacer

RPMHPTQ
3500266400
3600275402
3700281398
3800286395
3900292393
4000300394
4100310398
4200321402
4300331405
4400342408
4500352411
4600360411
4700365408
4800369404
4900375402
5000380399
5100383395
5200387391
5300391387
5400397386
5500401383
5600405379
5700407375
5800409371
5900411366
6000412360
6100412355
6200416353

Top-End Swap V2.2, 1.5-inch Spacer

RPMHPTQ
3500269404
3600278405
3700285404
3800291402
3900296399
4000302397
4100309396
4200318398
4300328400
4400339404
4500349408
4600359410
4700367410
4800373408
4900378405
5000382401
5100386397
5200390394
5300395391
5400401390
5500405387
5600409383
5700412379
5800415376
5900417371
6000419366
6100402362
6200420356

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