The difference between 305 and 350? - Chevy Impala SS Forum
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post #1 of 14 (permalink) Old 12-28-2012, 11:56 PM Thread Starter
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The difference between 305 and 350?

How can you tell the difference between a 305 and 350?
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post #2 of 14 (permalink) Old 12-29-2012, 12:50 AM
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Quote:
Originally Posted by gatorcity313 View Post
How can you tell the difference between a 305 and 350?

If the heads are off measure the bore, a 305 is 3.736" and a 350 is 4", they both use a 3.48" stroke crank but a 305 crank is about 50 grams lighter than a 350 crank.

If the engine is 1986 and newer it will be cast into the driver side bell housing with either 5.0 (305) or 5.7 (350)
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post #3 of 14 (permalink) Old 12-29-2012, 01:03 AM
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YEA LOOK AT THE NUMBER ON THE BACK OF THE MOTOR,I HATE 305s I RATHER GET A 327 OR 283 LOL
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post #4 of 14 (permalink) Old 12-29-2012, 01:57 AM Thread Starter
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Ok ill try that, I was told I have a 350 but it feels like a 305
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post #5 of 14 (permalink) Old 01-01-2013, 09:02 AM
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Quote:
Originally Posted by gatorcity313 View Post
Ok ill try that, I was told I have a 350 but it feels like a 305
What kind of car?
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post #6 of 14 (permalink) Old 01-01-2013, 11:08 AM Thread Starter
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93 caprice
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post #7 of 14 (permalink) Old 01-01-2013, 03:17 PM
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93 caprice
If still running the factory-equipped engine, you can tell by the 8th letter of the VIN. 'E' = 305, '7' = 350. Also, on the SPID label on the trunk will be 'L03' if it's a 305 or 'L05' if 350. If the engine has been swapped, you'll have to check the bellhousing, which is difficult to do with the engine in the car, but can be done with an inspection mirror.

On Caprice sedans, only 9C1 police cars or cars with the LTZ package had 350's available from the factory.

2005 Pontiac GTO
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post #8 of 14 (permalink) Old 01-01-2013, 05:42 PM
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What is the 8th digit in your serial number. You can also check your SPID for LO3 or LO5.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, custom fender skirts, stainless full moons, Recaros, Blazer console, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check http://www.impalassforum.com/vBullet...1#post11691762
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post #9 of 14 (permalink) Old 01-01-2013, 10:02 PM Thread Starter
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the vin says its a 305 but the guy said it was a 350 in it, didnt bother to check it out because of the great deal I was getting
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post #10 of 14 (permalink) Old 01-01-2013, 11:22 PM
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The difference between 305 and 350?

So,it didn't matter before. But,somehow it matters now?
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