Chevy 305

What is the bore range for a 1984 Chevy 305?

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2009-03-18 20:11:21
2009-03-18 20:11:21

.030 is the max you can bore a 92 305 i dont belive you can bore more then .030 over Some blocks you can go .40 over but the cylinders start getting thin and if you are building a H.P. engine you will have problems with overheating

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BORE is 3.740 and the stroke is 3.480

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Primarily the bore size. The 305 has a bore of 3.74 and the 350 is a 4.0 bore. They share the same stroke on the crank. And no, you can't bore a 305 to a 4.0 bore.

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No. The bore size is different between a 305 and 350. The 350 bore size is larger.

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The bore and stroke is---3.740 bore and 3.480 stroke. STOCK 305

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Subtract 305 from 350 and that will give you the difference (or interval) between the two numbers:- the answer is 45. However, if you mean what is the difference between a Chevy 305 and a Chevy 350, then it is the difference between the engine bore (the cylinder) sizes. The 305 bore is 3.740 inches. And the 350 bore is 4.000 inches, giving the Chevy 350 20HP more then the Chevy 305.

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No. There isn't enough material in a 305 to bore that far oversize without hitting water.

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NO The bore and stroke is different.

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No. You would need to bore the block to 4 inches, which is too much for a 305.

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A 305 chevy engine has a bore diameter of 3.736". Check the diameter of your L2256 piston to see if it is that size.

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The bore and piston size are the only real difference between the two.The 350 has a bigger bore and piston and so puts out more horsepower, the305 = 3.75" bore and the 350 = 4" bore. Both have the same stroke.Also the starters are different because of the smaller flywheel but other wise the external parts are interchangeable.

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3.740 x 3.480 / inches. Stock factory bore.

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I have an 84 305 and everything says 45, and uses r45ts plugs

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a Chevy 350 crank is a Chevy 305 crank. they have the same stroke, 3.48 inches, and are interchangable. swapping between the two cranks does not change the engines displacement

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Check the head casting numbers and reference a book that details what casting belongs to what. The best way to tell is measure the cylinder bore. Chevy 350 has a 4.00 inch bore, whereas the 305 has a 3.736 inch bore. You can't tell from the crank, they have the same crank with the same 3.480 inch stroke.

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the fireing order for a Chevy 305 is 18436572 with #1 being the drivers side plug closest to the radiator.

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any Chevy 305 block can be safely bored .060 over. if you have a good block, with thicker cylinder walls, it might be .080 borable.

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Hi It should be close to 3.75. A 350 eng. is 4.0 inchs. Hope that helped?

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the biggest difference is obviously the stroke and bore of the engine and the size of the engine

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A 305 had a 3.75 bore with 3.48 stroke. Adding .030 to the bore and using the formula pi times the radius squared times the stroke times the number of cylinders equals 312.

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307 pistons are 3.875" diameter. 305 pistons are 3.736". It might be possible to bore a 305 large enough to accept the 307 pistons, but the wrist pin location would be .230" off because of the different stroke. In short, no.

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no. the bore and stroke are as follow the 305 3.736''x 3.48" and the 350 4.000"x 3.48"

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If it's a carburetor version, there probably isn't a regulator.

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As far as I understand the only difference between a 305 and a 350 is the cylinder bore and piston size so a cam from a 305 should work in a 350 This person is correct in that the measurements of the bore and stroke the only difference is the bore. where they are wrong is that the internal balance weight is different and usually the journal size is different. As for a direct replacement, no it will not work, but with the help of a machine shop and some money it will work. However your money is better spent getting the right crank.


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