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Old 02-05-2008, 02:38 PM
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383 stroker clearence problems

Ok im sure you all get this asked alot but if building my first 383 stroker and my only problem so far is that the pistions are coming out of the cylinder bore a little bit i just want too make sure they wont hit the valves. the parts i have are....... 350 4-bolt main bored.30over, a egale 383 crankshaft, egale 5.7" i-beam rods, hypereutectic .30over pistons from keith black performance, gm performance fast burn aluminum cylinder heads. any advise welcome thank you!

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Old 02-05-2008, 04:44 PM
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How far out of the bore? if its too far you'll also have to worry about ring damage. Usually if its slightly out of the bore this can be corrected with a extra thick head gasket, but no matter, quench distance, piston to valve clearence will all have to be checked regardless.
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Old 02-05-2008, 06:06 PM
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well i ran outside measured it up and it .080 thousandths from the deck of the block to the top of the pistion. is that alot to be coming out of the bore? Is their a head gasket that would be thick enough? thanks again for the help!
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Old 02-05-2008, 06:22 PM
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400?

Somethings not right. What is the deck height? What rod lenth and what's the compression height on the pistons? Decked too far; unlikely. Wrong lenth of rod relative to piston compression height; most likely. Need more information. Hope you don't have to start over.
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Old 02-05-2008, 06:26 PM
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Quote:
Originally Posted by blazin_kustums
well i ran outside measured it up and it .080 thousandths from the deck of the block to the top of the pistion. is that alot to be coming out of the bore? Is their a head gasket that would be thick enough? thanks again for the help!
Not good, a little can be adjusted with head gasket selection, but this is too much.

What all was done, block decked, mains align bored?

What is the actual stroke of the crank? Not what they claim, what does it measure?

How long is the rod?

What piston are you using as in mfg and part number?

Bogie
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Old 02-05-2008, 06:33 PM
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This sounds like you are using off the shelf 350 pistons designed for a 3.48 stroke that have a 1.54-1.56 compression height.

You need the correct stroker pistons with a 1.425 compression height.
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Old 02-05-2008, 07:01 PM
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to gmc boogie that sounds like it may bee the issue i do have aftermarket factory 350 pistions any advise on who carrys the correct ones or a good brand??? thanks
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