Build, text and photos by Mike Mavrigian This final article installment covers the completion of the 408 LS build, along with the engine dyno results. Our radical-looking baby pulled a respectable 670.5 HP at 6500 rpm and 581/7 lb-ft of torque at 4900 rpm.
Build, text and photos by Mike Mavrigian Part 3 of the 408 LS series continues the build, discussing areas including sensors, oil pump, cylinder heads, valvetrain, front cover, water pump and crank damper installations. In Part 4 of the series, we’ll conclude assembly and provide a peak at our dyno [...]
Build, text and photos by Mike Mavrigian BLOCK PLUGS Using all new GM plugs, I installed the four threaded water jacket and oil plugs on the outside of the block (three steel 16mm plugs and one brass 30mm plug). These plugs feature straight metric threads. No NPT threads exist on the OE block. [...]
Build, photos and text by Mike Mavrigian This build features a GM LS platform, bored and stroked to 408 CID, with a 4.0305” bore and 4.000” stroke. A few of the notable elements include adapting Gen 1 smallblock Chevy valve covers to LS heads and a conversion to carburetion, this time using a [...]
Destructive crankshaft torsional vibration accelerates the wear of critical engine components. Honda® S2000 owners can now protect their engine, while gaining power, with the latest performance damper from Fluidampr® (part #530601, suggested retail $450). Fluidampr protects across a broad frequency band throughout the entire rpm range with a far greater lifespan compared to tuned rubber [...]
Build, text and photos by Mike Mavrigian Note: This engine, as well as all of our engine projects, is designed, test-fit and assembled by Mike Mavrigian’s Birchwood Automotive facility in Creston, OH. Now that the block, oil pan, valley cover plate and timing cover have been painted, we can begin final assembly. [...]
Ross Racing Engines’ Tony Lombardi cut the valve reliefs using an end mill and his adjustable piston vise. Build, text and photos by Mike Mavrigian The Pontiac bigblock build (starting with a 455 block and boring/stroking to 501 CID) is progressing. I apologize for the time delay, but this build has been [...]
King Engine Bearings will present “Race Engine Secrets: Bearing Clearance, Tolerances and Oils” during the upcoming technical seminars at two race industry trade shows. The seminars will be conducted by Ron Sledge, King’s new performance and technical manager.
Fluidampr has released a new catalog (vol. 11) featuring their popular SFI 18.1 spec performance harmonic dampers. The 20 page, full color layout is masterfully designed and includes valuable technical information for an appealing counter guide at any performance business retailer. Highlights include the Fluidampr performance damper for Chevy Camaro LS3 and L99 engines, [...]
Build, text and photos by Mike Mavrigian . I realize it’s been a while since my last posting of this project’s Part 1 article, but I’ve been tied up with multiple projects at the same time. Since the Part 1 article, I’ve obtained the crankshaft, had the heads finish-machined and assembled [...]