--- title: Pump Gas Monster: CNC Motorsports Builds a 582ci BBC (PT 2) description: The big-block Chevy keeps getting bigger. Aftermarket blocks, dedicated stroker cranks, and array of piston sizes are pushing the good ol’ Rat to unprecedented stature–and horsepower. --- [Blog | JE Pistons](https://info.jepistons.com) # [Pump Gas Monster: CNC Motorsports Builds a 582ci BBC (PT 2)](https://info.jepistons.com/pump-gas-monster-cnc-motorsports-builds-a-582ci-bbc-bottom-end-pt-2) Written by [Mike Magda](https://info.jepistons.com/author/mike-magda) | Jul 9, 2018 10:00:00 AM *The big-block Chevy keeps getting bigger. Aftermarket blocks, dedicated stroker cranks, and array of piston sizes are pushing the good ol’ Rat to unprecedented stature–and horsepower.* In the last installment of our big-block build, CNC Motorsports in Brookings, South Dakota, assembled the bottom end of a 582ci low-deck big-block Chevy. As a quick refresher, the engine is based on a Dart Big M Sportsman block with a standard (9.800in) deck height. The reason for keeping the deck height as short as possible is the engine’s intended destination: under the hood of a ’57 Chevy pickup, where clearance is king. **There was also plenty of valve-to-piston clearance as far as the lift; however, the large 2.350-inch intake valves in the Brodix heads came very close to the valve-pocket walls.** **The pockets were flycut for safe clearance.** A K1 Technologies 4.3875in stroker crank, 6.385in K1 connecting rods and 4.600in bore forged JE pistons complete the rotating assembly, and compression checks out at a pump-friendly 10.66:1. With the bottom end complete, it was time to finish up the engine and get it on the dyno.  **The Comp Cams custom hydraulic roller camshaft was lubricated and installed.** **The remainder of the Cloyes timing set is installed.** The first step was to install the camshaft. A hydraulic roller camshaft from Comp Cams with a custom, dual-profile grind was selected to maximize power and minimize maintenance. It came with the following specs: 254/262 @ .050 duration, .647-inch total valve lift, and 112 degrees lobe separation. The cam was mated to Lunati Street Performance lifters (PN 72331-16) and custom Trend Performance 1-piece, 3/8-inch pushrods made from .135in wall 4130 chromoly steel. The pushrods were measured and ordered at 7.800in and 8.700in long. **The cam was dialed in with a 108-degree intake centerline.** **Camshaft endplay was checked.** Spinning the cam is a Cloyes street billet roller timing set (PN 9-3510TX9). The 9-keyway crank sprocket allows versatile cam installation, and this cam was set with a 108-degree centerline. Protecting the timing set is a Comp Cams 2-piece billet aluminum cover (PN 212). Finishing up the short block is a 7-inch diameter Pro Race harmonic balancer (PN 34263). **The Melling oil pump is installed.** **The Kevko pickup has a handy tab to help installation without damaging the tube.** The Brodix oval-port heads (PN 2030002) feature 335cc intake ports. The intake valves are angled at 24 degrees with a 4-degree cant, and the exhaust is 15 and 4 degrees, respectively. Combustion chamber size was measured at 117cc. The heads also feature manganese bronze guides and ductile iron valve seats. **CNC Motorsports checked the pan-to-pickup clearance by placing a dab of modeling clay on the pickup and positioning the Kevko pan on the block without the gaskets.** **Note how the pickup was protected with painter’s tape, and that there is plenty of clearance.** The heads were assembled with Ferrea 2.350-inch stainless steel intake valves (PN F1225P) and 1.880-inch exhaust valves (PN F6157). Both have 11/32-inch stems and are secured with Comp Cams 10-degree tool-steel retainers (PN 1731-16) and locks (PN 611-16). Total valvetrain weight is 185.8 grams on the intake side and 156.4 grams on the exhaust. **The ARP head studs and Fel-Pro head gaskets are installed.** **The assembled Brodix heads are positioned and torqued to 80 ft-lb in three steps: 30-60-80.** CNC Motorsports opted for Comp Cams valve springs (PN 953-16) that were installed at a height of 1.850-inch with seat pressure of 170 pounds. Open pressure was 488 pounds at 1.203 inch. Finishing off the cylinder head assemblies were Comp Cams spring locators (4778-16), Comp Cams guide plates (PN 4806-8), ARP 7/16-inch rocker studs (PN 135-7101), and Lunati 1.7:1 aluminum roller rocker arms (PN 15350-16). **The Lunati hydraulic roller lifters are lubricated before installation in their bores.** **The lifters and Trend pushrods are installed in the block.** **The Lunati rocker arms are placed then installed with the proper preload. Next, the Brodix intake manifold is lowered into place.** The heads were installed using Fel Pro .390-inch thick steel wire-ring gaskets (PN 1057) and ARP head studs (PN 235-4702). The top end was completed with a Brodix intake manifold (BM2017-O), and an AED custom Holley Dominator carburetor. Spark is provided by MSD. Final beauty bling comes from the chrome CNC valve covers and a March Style Track CNC-machined aluminum serpentine accessory drive (PN 21255). **The Pro Race balancer slid onto the crank snout and pressed on using an installer tool.** **The completed engine with a March serpentine drive system is ready to take on the engine dyno.** On the dyno, the engine topped out at 800.5 horsepower at 6,200 rpm, while a peak torque of 739.5 lb-ft arrived at 5,000 rpm. The engine delivered more than 600 lb-ft from 2,700 rpm well past the pull’s safety cutoff of 6,600 rpm. **The 582ci pump gas BBC pulled a best of 800.5 horsepower at 6,200 rpm with peak torque of 739.5 lb-ft arriving at 5,000 rpm.** Massive torque, pump-gas-capacity, and an entirely usable powerband ensures two things: a happy customer, and plenty of smokey rubber. **Sources:** CNC Motorsports; 800-341-1528; [Cnc-motorsports.com](http://cnc-motorsports.com) JE Pistons; 714-898-9763; [JEPistons.com](http://jepistons.com) K1 Technologies; 440-497-3100; [K1technologies.com](http://k1technologies.com)   [View full post](https://info.jepistons.com/pump-gas-monster-cnc-motorsports-builds-a-582ci-bbc-bottom-end-pt-2) ```json { "@context" : "http://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Mike Magda" }, "dateModified" : "2018-04-09T16:52:56.298Z", "datePublished" : "2018-07-09T10:00:00Z", "headline" : "Pump Gas Monster: CNC Motorsports Builds a 582ci BBC (PT 2)", "image" : { "@type" : "ImageObject", "height" : 3648, "url" : "https://cdn2.hubspot.net/hubfs/2297913/001-je-pistons-582ci-big-block-build.jpg", "width" : 5472 }, "mainEntityOfPage" : "https://info.jepistons.com/pump-gas-monster-cnc-motorsports-builds-a-582ci-bbc-bottom-end-pt-2", "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "height" : 60, "url" : "/hs/hsstatic/content_shared_assets/static-1.4092/img/default-amp-logo.png", "width" : 60 }, "name" : "JE Pistons" } } ```