“CHEVROLET 7.4 LITER 454 -L29 COMPLETE ENGINE AND 4L80E TRANSMISSION.

Also known as the Vortec 7400, the L29 was the final and most modern iteration of the venerable big block Chevy. It was available from 1996 to 2000 in 2500/3500/3500HD trucks and 2500 Suburbans. Factory power rating was 290 HP at 4000rpm and torque was 410 ft-lbs at 3200rpm.

The L29 is considered the Gen 6 big block, with 4 bolt mains and a 1 piece rear-main seal. It was upgraded with a hydraulic roller camshaft, revised cylinder heads, 9.4:1 compression ratio, and a long runner multi-port fuel injection system.

The cylinder heads are unique to the L29/L21, featuring small oval ports with a swirl inducing “ski ramp”. The small 100cc combustion chambers allow a decent 9.4:1 compression ratio with flat top pistons, quite an improvement over the 7.9:1 compression of the previous generation L19. The valve train consists of non-adjustable, bolt down 1.70:1 rocker arms. The stock valve-springs are weak and barely adequate for the stock camshaft. While not as high flow as the large ovals and rectangle port heads of older big blocks, they are a marked improvement over the previous peanut port heads.

All engines were in running vehicles, we don’t know the history, sold as rebuildable.”