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If I take a 350 .30 over and use a crank with a 3.75 stroke and 5.7 rods what cubic inch does that give me?
By my calcs its a 383 right?
What piston specs would I need to have an 8.5 or 9.0 CR?
 

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If I take a 350 .30 over and use a crank with a 3.75 stroke and 5.7 rods what cubic inch does that give me?
By my calcs its a 383 right?
What piston specs would I need to have an 8.5 or 9.0 CR?

You need to know what the chamber volume is of the cylinder head you are going to use, piston crown design (flat top, dish, or dome) in addition to the stroke to arrive at the static compression ratio.

Your math is correct.
When you order your crank and pistons, be sure to spec both for use with 5.7" rods.
 

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It doesn't matter which rod you use. Except that the more dish you need the better the 5.700 rod works.

Assuming a 64cc head and .010 deck you need about 25cc for 8.5 and 20ccs for 8.5.

Horndog...if you know the desired C/R you can solve for net cc's.
 

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Too tired last night to break out the calculator ...
 
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