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Old 02-05-2007, 03:25 PM
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383 bore size question

Without knowing my exact bore size how do I go about buying head gaskets for my 383 stroker motor?

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Old 02-05-2007, 04:02 PM
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Same as stock 350. The added displacement comes by way of the longer stroke, usually from a 400 crank. The bore remains the same.
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Old 02-05-2007, 05:14 PM
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OK, thanks. I looked at Fel-Pro head gaskets on summit's site and they list several different bore sizes for the 350 chevy motor. What is the stock bore size?
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Old 02-05-2007, 05:31 PM
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A stock 350 bore size is 4.00". Most head gaskets available are usually larger I think 4.166 is a pretty standard size. A larger the diameter will decrease the compression ratio marginally and off course a smaller one increases it.
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Old 02-05-2007, 05:32 PM
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If you want to get technical about it:

#'s in Bore x Stoke Relationship

A stock 350 is 4.000 x 3.48

A 377 Can either be a stock 350 block with a 3.75 stoke crank 4.000 x 3.75, or it can be a 400 block bored .030 over with a 3.48 stroke crank 4.155 x 3.48

A 383 Can be either a 350 block bored .030 over with a 3.75 stroke crank 4.030 x 3.75, or it can be a 400 block bored .060 over with a 3.48 stroke crank 4.185 x 3.48

A 385 is a 350 block bored .040 over with a 3.75 stroke crank 4.040 x 3.75

A 388 is a 350 block bored .060 over with a 3.75 stroke crank 4.060 x 3.75

So if its a 350 block, and its in fact a 383 then the bore is 4.030.

Hope this clears things up and gives you some info for later on.
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Old 02-05-2007, 05:36 PM
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Thank you. That clears things up nicely.
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