RHS LS Aluminum Block - Bigger On The Inside Part 2

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In the last issue we began this engine journey by crafting together the short-block for our 461ci LS engine. For those who might have missed part one you can catch it on our website (www.camaroperformers.com). In short, we combined an RHS LS aluminum block, 4.250-inch Lunati rotating assembly, Wiseco slugs, and a ton of meticulous machine work to end up with a very stout short-block. And while a rock-solid bottom end is critical, the parts bolted on top are equally important if the goal is big, reliable power.

Camp 1109 03 Rhs Ls Aluminum Block 461ci Ls 2/27

Engines are nothing more than big air pumps. As such, power is a factor of how much air can be efficiently moved through it. So, the top end of any engine can make or break it in terms of power output, no matter how nice the bottom end is. For this reason, we sourced a pair of Mast Motorsports Black Label heads topped with a voluminous 102mm FAST intake. This combination proved quite capable of feeding atmosphere to the cylinders, and in a non-boosted application, this is even more critical.

As for the dyno results, Tom Nelson remarked, “I was impressed with the power output and the extended power range. It had a very broad and long torque curve for such a short hydraulic-cammed motor. The heads flowed great, and I feel with a solid roller and individual-runner set up, this same motor would very easily make 825 hp without sacrificing torque. Which when you think about it, is pretty amazing. In the end, 720 hp and 662 lb-ft from a naturally aspirated pump-gas hydraulic-roller motor that can be putted around town is pretty awesome. These are 540ci big-block power numbers out of a 461ci LS platform.” On the road, the engine has all the manners one would expect an LS engine to have. And while gas mileage may have taken a hit, the performance gain was well worth it. On the track, the engine pulls hard all the way to its rev limiter of 6,900 rpm and, the low-end torque really helps pull the car out of the corner even if you’re in one gear higher than you should be. Even though we stuck with the wet-sump oil system, we have zero pressure fluctuation even in 1.2g-plus turns. Overall, it’s a lightweight engine that shows you can fit a lot of displacement in a relatively diminutive package.

 camp 1109 01 Rhs Ls Aluminum Block Project Bad 3/27

CFM As Shipped W/ Back Cut
100 76 76
150 108 111
200 144 154
250 184 1 93
300 219 231
350 260 266
400 294 291
450 323 318
500 341 334
550 355 348
600 368 360
650 377 372
700 382 377
750 390 383
CFM As Shipped W/ Back Cut
100 76 76
150 108 111
200 144 154
250 184 1 93
300 219 231
350 260 266
400 294 291
450 323 318
500 341 334
550 355 348
600 368 360
650 377 372
700 382 377
750 390 383

Sources

Automotive Racing Products
Ventura , CA 93003
800-826-3045
www.arp-bolts.com
Lunati
662-892-1500
www.lunatipower.com
Wiseco Performance Products
Mentor, OH 44060
440-951-6600
www.wiseco.com
Westech Performance
Mira Loma, CA 91752
951-685-4767
www.westechperformance.com
Racing Head Service
Memphis, TN 38118
877-776-4323
http://www.racingheadservice.com
Mast Motorsports
Nagodoches, TX 75964
866-551-4916
http://www.mastmotorsports.com
Nelson Racing Engines
Chattsworth, CA 91311
818-998-5593
http://www.nelsonracingengines.com
Meziere Enterprises
Escondido, CA 92029
800-208-1755
meziere
Autokraft
715.874.5921
www.autokraft.org
FAST
Memphis, TN 38118
877-334-8355
http://www.fuelairspark.com
CHE Precision
805.499.8885
www.cheprecision.com
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