383

[VileZambonie]

If the engine was bored .060 over you would have 388 CID

(½ bore)² x π x stroke x # of cylinders = CID

example 4.030 bore ÷ 2 = 2.015 to the second power = 2.015 x 2.015 = 4.060225

4.060225 x 3.14 (pi) = 12.749106

12.749106 x stroke 3.75 = 47.809147

47.809147 x 8 cylinders = 382.47317

383 CID

[hotrod24]

i know it is suppost to be a 383 from a 350 but i dont know what it was bored so i am just going to tear it down and see what the shop thinks because i have no idea

[VileZambonie]

standard bore is 4"

typical oversizes are .030", .040", .060"

.030" = 383 with 3.75 stroke

[hotrod24]

so could i build a 396?

[frogman68]

so could i build a 396?

396 is a big block 383 is a small block

[hotrod24]

thats what i thought just giving it try so how high could i go?

[frogman68]

at .060 it would be (I think) a 388

[hotrod24]

ok i will just wait and stick with the 383 and then put a big block in a 2wd drive

[eventhorizon66]

Both 3.875" and 4" stroke cranks are available for the SBC.  With a 4.03" bore they would give you 395 cid and 408 cid, respectively.  But, I believe, at this level, stroker-profiled cap-screw type rods and a small-base circle cam become mandatory for clearance.  Also, rod/stroke ratios become quite low (for an SBC) with these strokes, which really doesn't mean much for a mild street engine other than marginally increased piston side-loading and bore wear.

[hotrod24]

what is the differents in a 350 and 383 what parts would i need for the 383?

[frogman68]

what is the differents in a 350 and 383 what parts would i need for the 383?

350 has 4.000 piston's 383 has 4.030 pistons
350 has a 350 crank
383 has a 400 crank

Think that about covers it. Some internal work needs to be done for rod clearance too

[hotrod24]

ok i was just wanting to know because i am going to get a rebuild book and i did not know if i should get it for a 350 or a 383

[VileZambonie]

It's the same thing. you may have to clearance grind the connecting rods and everything will be a test fit assembly. Once you have it all together you may want to rip it all apart and have everything balanced. If you're gonna build a 383 do it right or don't do it at all imo

[hotrod24]

i agree vile if you are not going to do something right the first time dont do it at all

[Lt.Del]

since a 383 stroker uses a 400 ci crank, the flywheel/flex plate will have to be for a 400 crank, and the harmonic balancer, since that goes with the crank.

www.delbridge.net/install