There are 4 different Vortec engines for that year. Stock horsepower at the crank are: The 4.3L (262ci) Vortec V6 has 190hp The 5.0L (305ci) Vortec V8 has 230hp The 5.7L (350ci) Vortec V8 has 255hp The 7.4L (454ci) Vortec V8 has 290hp
5.7L 350 Vortec engine.
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Under the upper intake assembly
The cylinder heads are diffrent. Intake from 1998 truck will not bolt up to 1990 heads.
If you are sure that it did not freeze and crack the block, Then the intake manifold gasket is leaking. That is a common problem with the vortec Chevy engines. You need to replace the gasket with a factory Chevy gasket from the dealer.
Right in front of the engine below the throttle cable. It has two 10 MM bolts and an electrical plug.
What transmission does a 1998 Chevy silverado 4x4 with vortec 350 in it have...it has a 4L60E OR 4L80E...60 HAS 17 BOATS AND 80 HAS 18
.060 in inches.
1998 - 1989 most Chevy gmc parts are the same,.. lmctrucks.com
98 chevy lddle control valve
The Factory5.7(350) V8 Vortec was rated at 255 net hp @4600rpm and 330 net torque @2800rpm
It is behind the engine and you can see it clearly in the middle its got your spark plug wires going to it and it has numbers on it if your looking at your engine from the front its directly in the middle at the back of your motor