Is the Chevy LT1 engine the same as the Chevy L99?
Is the Chevy LT1 engine the same as the Chevy L99?
The engine was first introduced in 1994 and available in the Chevy Caprice. It is almost the same as the LT1 except for the bore of 3.736 inches and the stroke. Also like the LT1, the L99 features a sequential fuel injection system and reverse-flow cooling as well as an optical ignition pickup.
What kind of intake does a 4.3L L99 have?
The 4.3L L99 was first run with the stock LT1 intake, stock throttle body and 1-3/4 inch long-tube headers. Smaller 1-5/8 inch headers were run in a later test and improved the power and torque by five to six horsepower and a like amount of torque through the whole curve.
How does reverse flow cooling work on the LT1?
The LT1 has a “reverse flow cooling” system that enables the cylinder heads to be cooled first. This results in keeping cylinder temperature lower and letting the engine run at a high compression.
What is the casting number on a Chevy LT1 engine?
The block casting number on the smaller engine is 10168588 and it also has “4.3” cast on the side. The block has smaller 3.74” connecting rods. ports and better flow.
What’s the difference between the LT1 and the L99?
Also like the LT1, the L99 features a sequential fuel injection system and reverse-flow cooling as well as an optical ignition pickup. The output on the L99 is 200 or 245 horsepower. It has better fuel economy but less power. The engines are virtually identical except for the bore and stroke. The L99 also uses pistons from the Vortec 5000.
The 4.3L L99 was first run with the stock LT1 intake, stock throttle body and 1-3/4 inch long-tube headers. Smaller 1-5/8 inch headers were run in a later test and improved the power and torque by five to six horsepower and a like amount of torque through the whole curve.
The LT1 has a “reverse flow cooling” system that enables the cylinder heads to be cooled first. This results in keeping cylinder temperature lower and letting the engine run at a high compression.
How much torque does a TPI L99 have?
Because the LT1 heads featured a different intake bolt pattern (with no intake water passages), this required modifications to the TPI intake. TPIS performed the required mods to facilitate the swap. Run with the LT1 intake, the mild (small cam) L99 produced 277 hp and 279 lb.-ft. of torque.
