Unbolt from the block & take the nuts off studs to exhaust flange. You will need a new gasket for the block & a new one for the flange.
it flows exhaust to the EGR value
it does not come with a block heater unless installed by a mechanic. if so, it will be in the engine block under the exhaust manifold. can see it from under the van
check for exhaust leaks around the manifold inlets and outlets.
Sounds like an exhaust leak.
Chevy does not cast the block size onto the block. once you see a big block compared small block you will know the difference. at a glance with nothing to compare it to id say look at the head. small block heads have one exhaust port close the ends and two exhaust ports real close together in the middle. the big blocks exhaust ports are evenly spaced and not close together at all. If it is a 350 or smaller it is a small block. If it is a 396 or larger it is a big block except for the 400 which was made in both small block and big block configuration.
When the center exhaust valves are side by side (siamese), it's a small block (EIIEEIIE). Big blocks are symmetrical (EIEIEIEI).
A 350 small block Chevy engine typically weighs around 500-575 pounds, including components like the intake manifold and exhaust manifolds.
It has 8 intakes and 8 exhaust if it's a V-8 engine.
The knock sensor is on the left side of the block below the exhaust manifold.
"SBC headers" typically refer to shorty headers for a Small Block Chevy engine. These headers are aftermarket performance parts that are designed to improve exhaust flow, increasing engine efficiency and power output. They are often used in high-performance applications or custom builds.
Nothing at all. A long block is the complete engine. A short block is just the engine with no intake, exhaust, or accessories installed.