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1/28/10 10:36pm - Original Message: 'SBC / What's the difference?'
KDADDY79
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Dutchess County, NY - USA

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White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484
I'm really going to show all you nice folks here at C3VR how little I know about motors Embarrassed. Here goze;
In fairly simple terms (if possible) can you explain the difference of the Small Block Chevy motors?
305 vs. 327 vs 350 vs. 355 vs. 383 vs. 400.
The blocks seem the same.
Is the difference in cam size, head/valve size, piston size?
Can you all 'splain it to me?
 
Thanks for any input here.
Kevin
 
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1/28/10 11:10pm - Reply: 'SBC / What's the difference?'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

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The difference in size is due to different bore sizes, as well as different stroke lengths on the crankshaft. The size on an engine is rated in cubic inches(or liters on newer engines). This is a combination of how many cubic inches measured in the bore, including the diameter of one cylinder bore, and the length of the piston stroke. That figure is multiplied by 8(on a V8 engine) to arrive at the final cubic inch rating.
(I don't have any specific figures handy, nor am I intelligent enough to have them stored in my pea brain)
The bore size is the diameter of the piston(plus a little for clearance), and the stroke is how far up/down in the bore the piston moves, which is a function of the crank.
A 355 is a 350 that has been bored(oversized) .030".
A 383 is a 350 that has been bored, and has a special crank that gives it a longer stroke. This requires a special rod length, as well as some minor block grinding to clear the longer throws of the crankshaft.
The heads, valve size, and cam, have nothing to do with the cubic displacement of the engine.
Hope this helps some...


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Joel Adams
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1/29/10 10:29am - Reply: 'SBC / What's the difference?'
MikeMc71
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Tucson, AZ - USA

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1970 White L-46 Air Roadster, 1971 White LT1 Coupe, 1971 Red Auto Air Coupe, 383 stroker, 430 HP, 2002 Millennium Yellow Auto Coupe

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383s rule. If you want a hot rod!

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1/29/10 12:50pm - Reply: 'SBC / What's the difference?'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

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#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

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I heard that! I've driven a few cars with 383s in them, and they were screamers!

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Joel Adams
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1/29/10 3:39pm - Reply: 'SBC / What's the difference?'
KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484
Thanks for the info!
From time to time I read the descriptions of different SBC motors for sale. It's a place to start.
Kevin


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1/29/10 11:26pm - Reply: 'SBC / What's the difference?'
dwright Gold Member
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Victor, NY - USA

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2004 Commemorative Edition Coupe, Auto w/HUD. 13K miles in 2015. Sold 1982 Red Coupe

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So can I have my 350 bored and stroked to 427, or is that a big block?

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1/29/10 11:55pm - Reply: 'SBC / What's the difference?'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

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#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
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Well...that's just sillly!
Actually, there are physical limits as to how far you can go on a small block. I'mma thinking the 383 is all she'll do....think about that for a second. You've added 30+ cubic inches!
You CAN go 427 using a bored 400 block, and a stroker crank, but from what I've heard, those are not very bulletproof. The cylinder walls of the 400 are pretty thin to start with.



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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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