![]() ![]() ![]() There are essentially two different grinds used with two different snouts, depending on which distributor was used on the engine.ģ50 – The crank for the LT1 looks just like the one in the late 350 and has the same casting number 14088526, but it’s balanced for the lightweight pistons that were installed in the LT1. Getting the right cam in the right engine can be a little bit tricky because there were several variations over the years. It’s real easy to spot if the heads are off because of the small 3.74″ bore. It’s a 10168588 casting that had the numbers “4.3” cast on the side, too. GM used the two-bolt block for everything but the Corvette because it had plenty of strength and it weighed a little bit less.Ģ65 – There was only one block used for the 265 cid version of the LT1. However, if it came out of a Corvette, it should be a four-bolt block, and if it came out of anything else, it was supposed to be a two-bolt. They both have the same 10125327 casting number, so there’s no sure way to know which one you have until you get the pan off. With all that in mind, let’s take a look at this family of engines and see what goes where.ģ50 – There are two blocks, one with two-bolt mains and one with four-bolt mains. There was also the “Baby LT1,” the 265 cid version that was the standard engine in the Caprice from 1994-‘96. cams that came with long and short dowels, and three different front covers. Īlthough the LT1 was only around for five years, there were two-bolt and four-bolt blocks, aluminum and cast iron heads, regular and H.O. This combination gave the LT1 300 hp in 1992 and ultimately led to the 1996 LT4 that used better heads, more cam timing, roller rockers and sequential fuel injection to make 330 hp. GM Powertrain accomplished all of this by reverse cooling the engine so they could bump the compression ratio up to 10.5 to 1, tweaking the airflow in and out of the engine, and using sophisticated electronic controls for both fuel and ignition. ![]() Compared to the 1991 Chevy 350 L98 with TPI, the LT1 made 20% more horsepower, got better fuel mileage, and had a much broader torque band with 90% of it’s peak torque available from just over 1,000 rpm all the way up to nearly 6,000 rpm. ![]()
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