Comp Cams unveils Gen V LT-1 grinds and RHS unveils two new heads, including one for small-bore, high-flow LS engines.
The folks from the Comp Group (Comp Cams, RHS, TCI Automotive, FAST, etc., unveiled a host of interesting new parts at the 2013 SEMA Show to enhance the performance of your new or old Bow Tie.
The new 2014 Corvette Stingray and Chevy trucks with the Gen V small-block are just hitting showrooms, but Comp Cams already has a line of camshafts for them that work with their advanced engine features (direct injection, variable valve time and active fuel management. These XFITM-series hydraulic roller cams allow users to leverage the OE technology for performance gains. Designed for the new LT1/L83/L86 V-8s, they feature four different lobe profiles to both create AFM compatibility and optimize intake and exhaust valve opening/closing events. They also increase torque and horsepower throughout the entire rpmrange, according to Comp, providing excellent responsiveness and mid-range power over stock. With a couple of C7 Corvettes already running in the 10s as we write this, there no doubt the need for this grinds exists!
With all this tech used by these engines, the cams must be used with Comp’s Phaser Limiter Kit (Part No. 5456), which limits the range of camshaft movement from 62 to 22 crank degrees, thus requiring VVT program tuning. The grinds are available for stock to highly modified applications. The smaller cams were developed for the L83 and L86 truck engines, while the larger versions are better suited to high-performance LT-1 applications. There are four off-the-shelf cams available, all with .572-inch lift (with a 1.8 ratio rocker). Duration at .050 varies from 212/224 (intake/exhaust) to 224/236. Custom grinds are also available.
On the cylinder head from RHS unveiled a CNC-ported LS7-design cylinder head to use with Chevy’s 5.7- and 6.0-liter LS engines. The Pro Elite 3.900-inch bore LS7 headsare said to boost horsepower by up to 100 over stock and feature all of the benefits of other RHS LS7 heads. These cylinder heads fit all LS applications down to the stock 3.900-inch bore and utilize LS7 intake manifolds.
They also come with unfinished P-Port (unfinished runner) versions, the heads’ intake ports are raised .220-inch from the stock location for a straight line of sight into the cylinder, and utilize the LS 6-bolt head design compatible with both the RHS LS Race Block and GM LSX Block. They can also be used with OEM, 4-bolt blocks. Additionally, a .750-inch- thick deck surface and reinforced rocker rails make for more rigidity in high horsepower and boosted applications. According to RHS, these heads are designed to use eight standard, LS1- style exhaust rockers and eight offset LS3-style intake rockers and stands, so there’s no need to order a full set of less common 1.8 ratio LS7 rockers.
If you’ve got between 454 and 502 cubes from yourstreet/race LS, Comp unveiled its Pro Elite 307cc Big-Port LS7 CNC-ported cylinder heads. According to RHS, theseare the only raised runner aftermarket LS7 heads with the runner volume to support large cubic inch applications, yet are still able to utilize both production and aftermarket intake manifolds and valve trains. Like the Pro Elite 3.900 heads, the intake ports are raised .220-inch from the stock location and the heads feature a .750-inch thick deck surface They work with all existing LS7 parts but have bigger intake ports and valves than the standard RHS Pro Elite LS7 heads.
These aluminum, CNC-ported heads feature a 307cc intake runner, 98cc exhaust runner and 69cc chamber vol- ume. The intake valve is 2.250-inch x 5/16-inch, while the exhaust valve is 1.615-inch x 8mm.