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This is kind of a dumb question but what is stoke stroke on a lt1 I've heard 3.48 and 3.75
 

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The stroke for a 3.75 is the strock for the 400 block, its also the stroke used in a 350 block, and that is what a 383 is! I hope that helps.
 

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I think what he means is:

400 block(4.125" bore based) with 3.75 stoke= 400 engine
350 block (4" bore based) with 3.75 stroke = 383 engine (using a 4.030 bore actually)
350 block (4" bore based) with 3.48 stroke = 350
400 block with 3.48 stroke = 377
400 block with 3.25 stroke = 352 (generally this is the NASCAR based combination)
350 block with 3.25 stroke = 327
350 block with 3" stroke = 302
 
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