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 [...]
Three custom engines will be on display at the Hot Rod & Restoration booth at the 2013 trade show in Indianapolis, March 14-16. The engines, built by Hot Rod & Restoration contributing tech writer Mike Mavrigian, include three distinctly different examples that befit the street rod and resto market.
Fel-Pro has expanded its range of MLS cylinder head gaskets for the GM LSX family of competition engines. Each of the new PermaTorque MLS head gaskets features Fel-Pro’s exclusive LaserWeld stopper layer technology currently in use in NASCAR, NHRA and IHRA competition.
MAHLE’S GM LS3/L92 4.100″ stroke engine PowerPak piston assemblies are available in both high and low compression applications. Machined from MAHLE’s exclusive stronger, lighter, low drag slipper skirt forgings, each of MAHLE’s PowerPak pistons are made in America. Additionally, the ring grooves are machined on MAHLE-manufactured machinery resulting in the flattest, best sealing ring grooves [...]
THE FINAL ASSEMBLY by Mike Mavrigian Our intent with this build is to illustrate how you can take advantage of current LS (mechanical) technology, and still create a somewhat old school traditional appearance, grabbing in the range of 450 HP, all without breaking the bank. In terms of exterior finish, we intentionally “relaxed” [...]
The Pontiac is being completed today, getting ready for display. . Both current project engines, including the “Retro” LS engine and the Pontiac 455 will be on display at the upcoming Hot Rod & Restoration show in Indianapolis. This year’s show is held at the Lucas Stadium complex, adjacent to the Indianapolis Convention Center, March [...]
This installment in our LS 5.3L “retro build” covers installation of our hydraulic roller lifters, cylinder heads, pushrods and rocker arms, completing the valvetrain. . Build, text and photos by Mike Mavrigian . CYLINDER HEADS While there’s nothing to complain about with the original casting number 862 aluminum heads (GM P/N 12559862), making them flow [...]