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General Motors has produced two different engines called LT4: 1996–1997 LT4 – GM Generation II Small-Block; 2015-(current) LT4 - GM Generation V Small-Block – Used in the Z06 Corvette & Cadillac CTS-V & Camaro ZL1 for years 2017–2019.
The firing order of older big-block engines is 1-8-4-3-6-5-7-2 [62] while Vortec 8100's firing order is 1-8-7-2-6-5-4-3. Other upgrades of Vortec 8100 include a new 18-bolt head bolt pattern, longer connecting rods, different symmetrical intake ports, different oil pan rails, and the use of metric threads throughout the engine.
Vortec is a trademarked name for a line of gasoline engines for General Motors trucks. The name first appeared in an advertisement for the 1985 model year 4.3 L V6 that used "vortex technology" to create a vortex inside the combustion chamber , creating a better air / fuel atomization. [ 1 ]
For 1996, the four gasoline engines underwent a series of design upgrades, becoming the Vortec 4300, 5000, 5700, and 7400, respectively. [14] To meet OBD-II compliance, the Vortec engines replaced throttle-body fuel injection with sequential fuel injection, redesigned engine camshaft and cylinder heads, along with longer-life engine coolant and ...
The engines were also sold for marine and stationary applications. In a 1938 reorganization, Winton Engine Corporation became the GM Cleveland Diesel Engine Division, and GM's Detroit Diesel Engine Division began production of smaller (50–149 cu in (0.8–2.4 L) per cylinder) diesel engines. Locomotive engines were moved under the GM Electro ...
Also the fuel pump boss is still present but undrilled (which dates back to the 1992 model year for production engines without a fuel pump block-off plate - some marine/industrial blocks and crate motors sold over the counter via GM dealerships e.g. Goodwrench, ZZ6, 350 H.O. retain the use of a mechanical fuel pump).