LS1 chamber. LS1 intake ports. All except L92 and LS7 feature cathedral style intake ports. Cathedral intake ports measure approximately 3 1/8″ in height. Cathedral intake ports measure approximately 1″ in width. Exhaust ports are D-shaped. The LS6 heads feature a casting number of 243. A view of LS6 intake ports. Heads feature pushrod clearance [...]
In addition to four vertical main cap bolts, each main cap also features one side-entry bolt per side. The Gen III and Gen IV blocks feature the thrust bearing located at the No. 3 main. The center valley on this LS6 block features two knock sensor bung locations. The LS7 blocks feature an easy-to-find cast-in [...]
CAMSHAFTS All LS series camshafts are of the roller style. The LS series of engines utilize a camshaft timing sensor. To provide a signal to the sensor, 1997-2004 LS engines feature a machined reluctor on the camshaft, located immediately in front of the No. 5 main cam journal. Camshafts from 2005 and later eliminate this [...]
LS ENGINE TECH The current new generations of GM engines are here to stay and represent the hot ticket for today’s and tomorrow’s hot-dog smallblocks for both street performance and racing applications. It’s time to get up to speed. by Mike Mavrigian photos by author LS6 aluminum 5.7L block. LS2 aluminum 6.0L block. The Gen [...]
The vacuum pump and alternator setup hangs low, leaving the head area clean. Belt tension adjustment on radius tooth setups don’t require much tension at all, which removes a bit of stress from the crank. The tooth engagement alone provides a positive pulley drive. Routing the -12 plumbing from the vacuum pump to the valve [...]
Even though the drive hub system will be clamped to the crank snout with the 6-inch long center bolt to prevent the possibility of independent hub rotation, two roll pins are installed to the hub. The countersunk inside face of the ATI Super Damper was then drilled to accept these roll pins. Plumbing the vacuum [...]
The BG fuel log is adjustable for length, allowing bowl-to-bowl spacing to be set by simply slipping the male tube inside the female tube. The male tube section of the BG fuel log features three sealing O-rings. Fitting the BG fuel rail to our Dominator was a piece of cake. I installed the Race Pumps [...]
Our initial distributor offered a very neat low profile, but the large diameter of the head made installation impossible due to a lack of intake plenum clearance, so I switched out to a smaller-diameter-head MSD. The MSD Pro-Billet distributor (P/N 85501) provided the intake manifold plenum clearance that we needed. Our MSD distributor features a [...]
CARBURETOR/FUEL PLUMBING Our big-gulp carb is Holley’s Ultra Dominator (P/N 0-80673), an 1,150 cfm race carb that features billet metering blocks, three-circuit metering, mechanical secondaries and oversized sight windows for easy float adjustment. Recommended fuel pressure is 5-7.5 psi. The anodized billet metering blocks feature changeable idle feed restrictors for easier tuning of the idle [...]
VALVE COVERS The 1/4-inch x 20 x 3.5-inch socket head cap screws supplied with the Moroso valve covers are fine, and function perfectly. But, being the anal dolt that I am, I wanted to dress things up a bit more. I installed stainless-steel 1/4-inch x 20 x 4-inch studs into the heads (purchased from McMaster-Carr [...]
Subscribe to Precision Engine
Sign up for our E-newsletter