Dart’s new LS Next block in production:

Written by Moore Good Ink Earlier interview with Richard Maskin • 9.240in deck height • Cylinders extended by .375in (effective deck height 9.615in) • Stock & aftermarket LS components utilized • Available in standard 4.000in & 4.125in bore sizes (4.200in maximum) • Manufactured on homeland soil using premium cast iron   In Dart’s dyno room on April 4, their new LS Next block was undergoing its final stages of testing before making its production debut.  “It produced 740hp @ 7,000rpm,” said its creator Richard Maskin “and it sustained 700hp for a long way.” Configured with 4.155in bore and 4in stroke the 434cu in test engine made 600ft lbs of torque. See original story here →  Introduced by General Motors in 1997, the purpose of Dart’s LS replacement block is to exploit greater potential from the engine, particularly in the reduction of windage and improved lubrication. To keep the tests simple and meaningful Dart used a distributor and a carburetor. In so doing they isolated the effects of modern ignition, fuel injection, and electronics from the equation. “It’s got a mechanical roller camshaft in it,” said Richard, “because I wanted to be able to rev it to 8,000rpm with the existing springs. It makes over 690hp @ 8,000rpm. It has a real flat power curve emphasizing its suitability for street use. It’s got a small cam in it, 255/265. It’s got our Cathedral-port heads, GM intake manifold, and a conventional-looking oil pan. It has, however, 12:1 compression ratio.” To monitor the oil level during testing, a sight gauge was installed on the side of the engine. Because the lubrication system...