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Old 10-05-2008, 03:07 PM
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questions for the guys who built 383s

what exactly has to be done to a 350 block in order to build a 383?

and if i bought a rotating assembly kit for a 383 it comes with the pistions and rods, crank, flexplate, rings, and whatever else does all that come ready to go or do i need to have that crank machined as well? if i bought this kit would the block need any more machine work? or does buying the kit cancel all that out except for the cylinder boring? im a little lost on the stroker subject, its my first one.

if i bought a forged steel crank for a chevy 400 small block and the rods as well would i be better off just taking them to the machine shop with the 350 block and tell them what i want to build and let them machine it?

ill be honest i dont know a lot about the 383 stroker, i have a basic idea but im a perfectionist with my truck and im not touching this block or ordering one part until i know exactly what i need for it.

if anyone has any top end suggestions that would be cool too, id like to have roughly 450 - 475 horsepower. from what i understand the 383 can be a torque monster, which is good because its going in a all steel body 62 c-10 longbed...maybe. a mini tub may be done so i can get more rubber underneath the back end. id like to run it on pump gas too, but that is not a big deal.

thanks in advance for any information.


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Old 10-05-2008, 04:34 PM
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Installing a 3.75 stroke crank in a 350 block normally requires clearancing at the bottom of the cylinders and in some cases the pan rails. How much depends on the connecting rods used.

Clearancing the the rods/bolts is required to clear the camshaft if using 5.7 or longer rods. Scat and others make a rod that is profiled to clear the cam right out of the box.

You need at least .050 clearance everywhere throughout the cycle.

Best bet is preassemble the short block with the componets being used and slowly rotate the crankshaft with cam and timing set installed. Mark areas of contact or low clearance with a sharpie. These areas can now be relieved with a carbide bit on an air or electric tool of choice. DO NOT GET CARRIED AWAY can hit a water jacket. Be sure to reclean everything before final assembly.

I have had good luck with the Scat 9000 series cast steel cranks.

The rotating assembly should come ready to go except for balancing.

Lots and lots of info here...a search of this topic will turn up lots of reading.
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Old 10-05-2008, 05:00 PM
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I hope nobody takes offense to this.

A quick inquiry of, '383 stroker' in the "Search" function, would have given you more to read. It is getting to be more like an 'Encyclopedia' size of information.

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Old 10-05-2008, 05:07 PM
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thanks for the info guys...i tottaly spaced the search option. im gonna go check that out and prepare to read my *** off lol. thanks again
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