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Old 07-25-2012, 01:23 PM
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383 kit w/blower

Im new to building from the ground up , I purchased a 78 vette project I'm planing on turning it into a 383 with a 177 blower I was qurious of what anyone had to say about the kit I'm planing on purchasing here are the specs. As well as your thoughts on the blower I'm going with as a combo thanks.

Scat nodular cast steel crankshaft.
H-beam 5.7 Full floating Bushed rods with 7/16 12 Point cap screws.
Probe low expansion Fully forged 12cc dish pistons 4.030 bore size
Hastings plasma Moly rings
king bearings
Pro street damper
168 tooth flex plate

Thanks,

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Old 07-27-2012, 04:46 PM
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NO.
Forged is the way to go with forced induction. What are you planning for cr? Make sure the kit will work with the heads you want, deck hight, etc...
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Old 07-27-2012, 06:56 PM
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I think BigDog is right. The scat cast cranks are pretty good to 500 HP. But I think you'll be pushing, or exceeding that.

PatM
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Old 07-27-2012, 07:11 PM
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automatic?
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Old 07-28-2012, 02:52 PM
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What crank would do the best ? and I'm torn on cams I'm not sure the way to go for the build I'm thinking I want to go with a mid sized cam and let the blower make most the power
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Old 07-28-2012, 02:53 PM
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Yes it's an auto manual was to hard to find for any good price
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Old 07-28-2012, 04:10 PM
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What I do for the cam is either to pick a cam and build the engine based of of it. Or build the engine how you want it to perform and pick a cam that works with what you want.
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Old 07-28-2012, 04:12 PM
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You have picked the wrong pistons. The compression ratio will end up way too high.

You want a low low compression ratio 7.5:1 ~ 8:1

its is much easier to build a 355 based blower motor with the correct low compression ratio using of the shelf parts.

A 355 build correctly with 7.5:1 cr will allow much more boost and timing and make more horsepower than a 383 buildt wrong with the wrong compression ratio
that will be limited/crippled by limited boost on pump gas.

Build a 355 SBC with 70-75+cc heads (EG: AFR #1036 w/valve spring upgrade) and -22CC dished forged blower/turbo pistons. This allows serious 10-12# boost and big RELIABLE horsepower on 92+ octane pump gas.

Use a mechanical street roller cam and a 850-950cfm carb
Crane Cam # 118521 or #118531 is a good example of the cam to run.

2.10 to 2.28:1 blower drive ratio, good premium.pump gas

A similar build 383 with low compression requires a -30 to -35cc dished piston.

Low engine compression ratio is key to making big street power with this 177 blower on pump gas.

Last edited by F-BIRD'88; 07-28-2012 at 04:26 PM.
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Old 07-28-2012, 04:36 PM
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SMALL BLOCK CHEVY - EXTREME DUTY 23 INV. DOME - JE Pistons

JE has the right inverse dome (dished) blower pistons to build either a 355 or 383
Usubg 75+cc heads

The 355 uses their -22cc piston and the 383 uses their -31cc piston
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Old 07-28-2012, 05:01 PM
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I actually noticed that and I can get the -22 dish pistons for the same price I'm trying not to spend a ton but want good horsepower I found the kit for 850 block after machine work around 650 and 2500 for the 177 supercharger and I figure with about another 1500 I can pick up a good set of heads and cam
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Old 07-28-2012, 05:09 PM
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[IMG]<a href="http://s1113.photobucket.com/albums/k520/jldirectdfw1/?action=view&amp;current=1b3ebea1.jpg" target="_blank"><img src="http://i1113.photobucket.com/albums/k520/jldirectdfw1/1b3ebea1.jpg" border="0" alt="Uploaded from the Photobucket iPhone App"></a>[/IMG]<br>here's the new project
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Old 07-28-2012, 05:22 PM
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Quote:
Originally Posted by 78vette View Post
I actually noticed that and I can get the -22 dish pistons for the same price I'm trying not to spend a ton but want good horsepower I found the kit for 850 block after machine work around 650 and 2500 for the 177 supercharger and I figure with about another 1500 I can pick up a good set of heads and cam
if you are on a strict budget build the 355 version using -22cc pistons and 75cc heads and use this Crane F-280-2 mechanical flat tappet cam
Crane #114681 ( I would set the lash "cold" at .020 to .022" on this street friendly, blower friendly cam.)

The low compression 355 built for high boost on pump gas
will outperform a 383 that will be limited to lower boost
because the compression ratio is too high

The blower make the power, the low compression ratio allows
more aggressive blower boost and power on pump gas for max street
performance.

A Brodix IK200 head (70cc version) with the chambers opened up a bit by hand
gets it done. (75cc finished chamber volume )

A $1500 AFR 195 eliminator #1036 (75cc chambers) is pretty much ready out of the box
for this.

You can expect serious, reliable street power on 92+ octane gas.
600+ HP (2.10 to 2.28 drive ratio)
The compression ratios are based on a 0 decked block and .041" head gasket.
The nice thing about doing it right is you only have to do it once.

Last edited by F-BIRD'88; 07-28-2012 at 05:33 PM.
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Old 07-28-2012, 06:08 PM
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You will want to boost reference the power valve on the Holley carb for this setup.
This is a straight forward drilling operation/modification on the carb body. You can DIY.
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Old 07-30-2012, 02:00 PM
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I think Im gonna go with the 355 now that I looked into it and looks like I'll save a lot of money going that route thanks guys for the advice
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Old 07-30-2012, 02:59 PM
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Quote:
Originally Posted by 78vette View Post
I think Im gonna go with the 355 now that I looked into it and looks like I'll save a lot of money going that route thanks guys for the advice
I have come to the same conclusion after doing my own cost/benefit analysis 355 vs 383 street blower motor.

The 355 is much cheaper and simplier to build and allows you to invest in much better cylinder heads as well as get the cr just right, easily .

More street power with better reliability on pump gas ,, for less money in the end.

Your only problem will be keeping tread on the tires. And keeping it out of the ditch
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