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View Full Version : Why do 383 stroker's cost so much?

12-24-2011, 06:26:28 PM
What is it about a 383 that puts them in the 2000$ range all day long? You can pick up bbc's and 350's for alot less exspensive. Is it just that people think they are worth that kinda money? Or do they actually sell?

12-24-2011, 06:45:31 PM
gm never actually produced a 383 from the factory so essentially a 383 is a custom build, requiring machining work etc

12-24-2011, 06:48:55 PM
A 383 is actually a 350 sbc .30 over isn't it? Also aren't 383's actually a factory mopar engine?

12-24-2011, 06:55:31 PM
The 383 small block Chevy is a .030 over 350 with a 3.75" stroke crank. The factory 350 crank was 3.48". 383 Mopar is a completely different animal, and are really a dime a dozen compared to 440s.

12-24-2011, 06:56:48 PM
A 383 is normally a 350 block bored .030" over, then the crank is changed from a 3.48" stroke to one with a 3.75" stroke.

GM does make a crate motor that is a 4.00" bore (no overbore) with a 3.80" stroke they call an HT383 made for truck applications.

12-24-2011, 07:44:39 PM
I was under the impression they cost 3 or 4k? I wish I could find one for 2k! haha or were you talking about used motors?

12-24-2011, 07:48:15 PM
Yep, looking on Craigslist all day long you can find them in the 1500-3000 range used.

12-24-2011, 07:56:34 PM
Build one http://www.superchevy.com/technical/engines_drivetrain/completebuilds_testing/sucp_0706_small_block_chevy_stroker_kit/viewall.html

12-24-2011, 08:03:17 PM
Factory blocks almost always require clearancing to fit that long a stroke inside them. That takes time and can't be done by a machine. Best comment from above: "because they are a custom build." Try one yourself from a junkyard block and you'll see how true that is.

Led Zep
12-24-2011, 08:12:24 PM
383 is a modification.If you bore a 350 say 30 over,you need to buy new pistons regardless.Back in the day getting a 350 iron crank reground at the machine shop was 100 bucks.Now you can buy a steel 383 crank(Scat,Eagle.etc.) for 200 bucks.You can get a good set of rods for under 200 bucks.New flexplate and balancer another 150 bucks.

When you rebuild a 350,the 383 is a good bang for buck project.

12-24-2011, 08:40:04 PM
What kind of money does it take to turn a running 350 into a 383? With decent cam, etc..

Led Zep
12-24-2011, 08:59:09 PM
Less than a 1000 easy.

12-24-2011, 10:45:26 PM
Factory blocks almost always require clearancing to fit that long a stroke inside them. That takes time and can't be done by a machine. Best comment from above: "because they are a custom build." Try one yourself from a junkyard block and you'll see how true that is.

That funny I have been stroker clearancing blocks for 11 years now in my CNC machine, Seems to be very accurate.

You can buy cheap kits on ebay but most do not have rods that will clear the cam and pan rail like a real stroker rod.

12-25-2011, 01:36:51 AM
Less than a 1000 easy.

Wow how is this possible unless you used old used parts you had laying around? Most anyone here would want to run a nice roller cam setup. That alone is about 850 bucks...for the whole setup. Then decent heads are going to cost a pretty penny too. I guess how much it costs depends on what you have laying around. If someone has a stockpile of parts, getting the block itself to a 383 wouldn't cost alot but to have a motor ready to go would. This is what I'm trying to decide for myself right now, whether to just pony up 3 or 4k for a good 383 crate motor such as a derebery etc or whether to try to piece something together.

12-25-2011, 02:48:46 AM
Buy a 383 rotating assembly, have the machine work done on your block. All the other parts, heads, cam, intake ect. you're going to have to buy whether you build a 302, 327, 350 or a 383 stroker. Internal engine parts cost about the same for a 350 or a 383 stroker.

It's not like 20 years ago when you had to find a SBC 400 crank and have the mains ground down to fit a 350 block or buy a custom racing crank. Now 3.75" stroke cranks come to fit in a 350 block at no additional cost. Might as well go with the larger displacement engine, especially if it's a street car. Torque makes street cars a lot more fun!

I built a mild 385 stroker (.040" over) for my Camaro. My Scat Stroker Kit cost about $1000. It came with their internally balanced 9000 series Cast Crank, Forged "I" beam Stroker Rods, KB Forged Pistons, Total Seal Rings and bearings. I had the machine work done and did the block clearance work, fit the rings and assembled it myself, piece of cake.


night rider
12-25-2011, 03:40:37 AM
Because 383's are custom stroker engines.

Its a 350 block bored .030" over and a 3.75" stroke crank added (400 small block)

You have to have pistons that has the correct compression height for a 3.75" stroke and what ever rod lenght you run, plus fit bore size

Then you have to stroker clearance (grind) the rod bolt shoulders or buy stroker clearanced rods

Then you have to stroker clearance the block, grind on block's oil pan rails and bottom of cylinder bores to fit the larger crank

Then factory oil pan won't fit so you have to clearance it or use aftermarket pan

You may have rod to cam clearance probs even with the stroker clearanced rods, depending on size cam you use, so if thats the case you need a small base circle camshaft.

You got to have it all balanced at machine shop

Depending on the crank you buy you may need a 400 small block damper and flex plate/flywheel