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Quick Summary

Product:  RHS® LS Race Block
Part Number:  #54900 (9.750” Tall Deck, 4.165” Bore); #54901 (9.750” Tall Deck, 4.125” Bore); #54902 (9.240” Std. Deck, 4.165” Bore); #54903 (9.240” Std. Deck; 4.125” Bore)

Features & Benefits 

  • Designed from heavy-duty A357-T6 aluminum material
  • Available in standard (9.240”) & tall (9.750”) deck heights with beefy .750” deck thickness
  • Accommodates up to 4.6” stroke with standard rod pins (2.100”) & oversized 60mm camshaft
  • Raised cam centerline (.388”/9.86mm) to allow larger stroke; 2 extra links in the timing chain
  • 4.125”-4.165” Siamese cast bore walls with press-in spun cast iron liner
  • Priority main oiling, galley moved outboard for longer stroke clearance & minimal windage
  • Dry sump friendly with big front & rear AN-12 side feeds
  • GM Gen III/Gen IV compliant with race mounts for Gen I, Gen II, Gen III & Gen IV engines
  • Block weighs under 140lbs

Brian Reese poses with the stock EFI intake and holding one of the new tuned runners for that intake.

In developing the new LS block, the engineering folks at Comp Cams also are working on the EFI induction system predominately used on the motor. What they have done is to develop a fuel injection intake manifold with individual runners that can be changed and modified to tune each cylinder.

What engine tuners have known for some time is that an engine really consists of a bunch of engines trying to work together. In other words a V-8 engine is actually eight individual engines bolted together and in order for it to develop and deliver the most power, each one of the engines need to work at peak efficiency.

One of the issues in making peak power with a naturally aspirated engine is getting the right fuel/air mixture to the combustion chamber, and the length of the intake runner can be critical in doing that. For years street/strip racers have been limited to cast aluminum intake manifolds. The intake runner distances were not able to be changed.

Now the guys in the back room at Comp led by Brian Reese are working on an intake where you can adjust and tune the runner length as a tuning tool. We thought our readers would be interested in seeing the prototype of this new manifold. According to Reese this new manifold will be available in the near future.

(above) On the left is the original EFI intake shape for the LS engine.  On the right is the same intake with a runner with a different shape replacing the stock unit.

(right) The stock LS intake with a couple of different intake runners.

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