i wa sjust wondering if a guy had a 350 whta do you have to buy, and what has to be done to the block to make it work. Also what kind of power can you get?
any help is appreciated!
thanx

 

The basic priciple is putting a crank from a 400 small block into a 350. The rods also have to be changed to match the crank and some machining may also be done to the block. I know there is more to it than this, but at least you have a basic idea.

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'86 IROC-Z, 305 LG-4, T-5, T-Tops, 50k Original Miles, K&N Air Filter, Jet chip, KYB Shocks/Struts, Centerforce Dual Friction, B&M Ripper Shifter, Hooker Super Comp Shorties and Y-pipe, Catco Converter, Flowmaster 80 series, 3 inch custom exhaust

 

You need to buy a new crankshaft and pistons. The block needs to be bored and stroked at a machine shop. The power you'd get should put you around 400 horse though. I don't know what other things need to be done to do this but I'm sure someone with more experience than me will respond.

Matt

 

To make a 383, you need a 400 damper,400 flywheel. Then you can use 350 pistons if you use 400 rods, the 5.565" ones. 350 pistons will work fine. But for better geometry, use 5.7" rods. Then you'll need to order special pistons for that application.
The block will need to be bored .030 over, and you'll need to do some grinding in the oil valley, or the crank during roation will hit. If you set the 400 crank down in the bottom, you'll see what I mean.
Then I would have a machine shop clearance the rods. They need to have that done or they might hit the cam. Then have it all balanced.
Get a cam like the Lunati 230@.050 with .480 lift, or the Comp XE268. Both are great cams for 383's.

383's like to breathe, so be sure you have a good set of heads to support it, as well as exhaust to help it.

Once you do a 383,compared to a 350, you'll never go back.

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350 4 bolt main, Speed-O-Motive 383 stroker kit, re-sized rods ground for clearance,TRW Forged pistons,10.7:1 compression,HPC Coated RPM intake, Holley 750 cfm carb,World Products Sportsman II heads,2.02/1.60 valves, Comp Cam 1.6 roller rockers, Comp Xtreme 284 cam,240/246@.050 with .540 lift,Crane pushrods,ATI damper,Proform HEI and MSD6A box,HPC coated 1 5/8 headers, 2.5" exhaust with 40 series mufflers,TH350 with Hughes 3000 stall, Powertrax NoSlip Locker, 4.11 gears.