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I have an Chevy engine that I recently bought from a guy who had inherited it. He mentioned that the motor might be bored out to 383, but he wasn't sure. I have the heads off, and I am going to pull the motor here soon. How can I tell if its bored out or not?

2007-01-01 06:28:37 · 7 answers · asked by raven14058 2 in Cars & Transportation Maintenance & Repairs

7 answers

Freddyboy is right, measure it with the piston at the bottom of the stroke to the top of its travel. :)

Boring alone does not increase the volume very much.

2007-01-01 07:28:26 · answer #1 · answered by Anonymous · 1 0

gdwrch40 is correct, the block should be a sbc 350 that has been bored to a 355. then you must have a crank that was forged for a sbc400 and also the rods, this gives the 355 block a stroke to a 383. you can also d-stroke a sbc 400 to a 377 buy putting a sbc 350 crank and rods into it. To awnser your question on how to now weather or not your engine is bored, with the heads off you then measure the width of the cylinder walls. A 355 will be approx. .030 bigger than a standard bore 350.

2007-01-01 14:43:12 · answer #2 · answered by Big Tim 2 · 0 0

Haven't seen a bored engine yet that the pistons were not marked. They are stamped on the top. An old MOTORS manual will give block numbers that will tell ytou what the block actually is. Like the other guy's said, the crank may have been changed.I have no clue how tell one crank from another.The guys that I hang around with can tell by looking at them..Get hold of somebody who does a lot of Chevy work, they should know....

2007-01-01 16:03:29 · answer #3 · answered by buzzwaltz 4 · 0 0

tis hard to say. a 383 consists of boring the cylinder walls .30 over and stuffing a 400 crank in there. if its bored over without the crank its only a 355. and you have to make sure its a 350 block and not a 305 or 400. your best bet would be to befriend a mechanic or take it to a local shop.

2007-01-01 14:33:24 · answer #4 · answered by super_sport_ss_2002 2 · 0 0

It is easy to measure with the heads off. You need one of those six-inch steel rulers the machinists use (for accuracy). The widest part of the cylinder opening should be 4.000" or maybe 3.900" (see chart). If its a little over 4.000, its been bored. Rotate the engine with the crankshaft pulley to get a cylider at the bottom of its stroke and measure the depth. It should be 3.480" or maybe 3.660" for stock.
If it measures 3.750"...congratulations...!! You have a (legendary) 383...!!
Heres a bore and stroke chart for Chevy motors...
http://www.mortec.com/borstrok.htm

2007-01-01 14:45:57 · answer #5 · answered by FreddyBoy1 6 · 1 0

Take a piston to any competent machine shop. They can measure it and tell you what it is. 350 bored out to 20 over, what ever. Then you will know what rings to get for it. You might check and see if perhaps the crank has been modified too.

2007-01-01 14:38:37 · answer #6 · answered by oklatom 7 · 0 0

If it' a stroker,it has longer rods,different pistons,different crank and block machine work.

2007-01-01 14:33:01 · answer #7 · answered by gdwrnch40 6 · 0 1

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