There are new cranks from the aftermarket for this. Check with Summit, Jeg's, or similar.
You can also use a crank from a 400, but the main journals will need to be modified to fit the block.
The stroke is 3.75".
Chevy did not use a crank sensor on that year.
They did not use a crank sensor in 1984, There was no need for 1
install 3.8 Chevy impala crank sensor passenger side , remove wheel and use pully to pull out crank shaft
That year did not use a crank sensor.
That year model did not use are have a crank sensor.
That year did not use a crankshaft sensor. It used an ignition module.
Chevrolet never built a 383 for production use. Many aftermarket suppliers have produced a 383 Chevy. It was originally built by taking a 400 crankshaft and having the main journals reground to fit a 350 block. The combination of the 400 crank and rods with the 350 block and pistons yields a reciprocating assembly with correct compression height. In standard bore, this would make 377 cubic inches. The 383 would be a .030" overbore. Since most of those parts have been used up, the aftermarket now produces all new parts to build a 383. It could be noted that Chrysler produced a 383 for many years during the 60's and 70's. It has nothing in common with the Chevrolet.
No the diameter of the crank journals are different.
Use the Square end of the jank crank rod. I had the same problem
105 amp.
the lt1 is a 350 but if the engine has ever had any work done to it the guy probably have had .030 shaved off the cylinder walls and installed .030 larger pistons this gives you a 383 ABOVE STATEMENT IN INCORRECT A Chevy 350 is 4.000" bore with 3.48" stroke. Engine rebored .030" oversize is 355. A Chevy 383 is 4.030" with 3.75" stroke. To answer the original question, racing sanctioning bodies have a device that screws into a spark plug hole and measures displacement. Without that device, you cannot tell a 350 from a 383 without pulling off a head and measuring the distance the piston travels from top dead center to bottom dead center and the diameters of the cylinders. ABOVE STATEMENT IS GOOD BUT DOES NOT ANSWER QUESTION To get a 383 you use the crank out of a 400 small block or an after market crank. Because of limited space it can't be internaly balanced, so it uses the harmonic balancer specifically balanced for a 400 motor, which is not uniformaly round to balance the 400. You can tell a 400 balancer by watching the harmonic balancer when running at low idle to see if it looks like a chunk is missing from the back side of it. This is a sure sign of a 383 stroker.Some of the newer after market 383 cranks could be internaly balanced, then they would use a regular 350 balancer. I haven't seen one yet,but I build old school 400's and 383's. Check the balancer first.
One-piece cranks use 1/2" thread