404CI LS2 Carburetor Engine Build - High Winder

While this isn't pertinent to the build, we wanted to emphasize that being organized during any build will eliminate potential headaches. Everything from the Comp solid-roller tappets to fasteners is within arms reach and easily accountable for.

In the center of the beast is this custom built Comp solid-roller camshaft. This cam isn't for the weakhearted and specs in on a 113 lobe separation and 0.834/0.800-inch intake/exhaust lift. Duration is rather stout at 0.050 with 277 degrees on the intake and 288 on the exhaust side.

Since we outfitted our TFS heads with Comp 947 springs, which feature a 1.650 diameter and 338 lbs on the seat with a 2.00-inch installed height and 850 lbs open, we needed a robust pushrod to prevent any potential deflection; our choice was Comps 3/8-inch chrome-moly Hi-Tech pushrod with a 0.080-inch wall.

To seal the cylinder heads onto the short-block, we used Fel-Pro's line of PermaTorque MLS gaskets. We've used the 1161s in the past and have had great success with them, even with big hits of nitrous. When you order them, it's important to note that they are sold individually and numbered 1161L and 1161R, for left and right. With the heads in place, Nathan Hall then torqued them to 70 ft-lb with moly.

Along with Comp's serious-duty triple springs, we added their line of titanium retainers and 1.7:1 aluminum shaft rockers. These full roller arms are just what we needed for valvetrain stability in the upper rpm range. If you're using factory valve covers, you will have to modify them slightly to fit. We're planning to reuse our Moroso sheetmetal valve covers and they cleared without any fitment issues.
Our biggest change was modifying the Trick Flow 235cc cylinder heads by swapping out the 2.08-inch valves for larger 2.10-inch valves from Si Valves. While we wanted to improve the already impressive flow figures, the 2.10 valve on the intake side also added 0.070 install height, allowing us to properly match the necessary Comp 947 triple valvesprings for the aggressive solid roller camshaft. We did the same on the exhaust side, but maintained the 1.60-inch diameter valve.

The other change was swapping over from the Edelbrock Victor Jr. manifold that's rated up to 600 horsepower for the Super Victor. This manifold stands an inch taller, has larger exit ports, and an has operating range up to 8,000 rpm.

For the oiling system, we decided to forgo the factory oil pump for an external wet sump assembly. We'll talk more about that next month, but we found that Moroso offers an affordable 7-quart oil pan with the necessary fitting, making it a very simple conversion.

To feed the fire, we're using Quick Fuel Technology's all new three-circuit 1,050-cfm carburetor. If you're looking for a carb with all the bells and whistles, then this is something you need to check out. The throttle-body is CNC machined and comes with a CNC metering block with four stages of emulsion, giving you the ability to tune for maximum performance.