Difference between a Chevy 305 and a 350?
Thread Starter
Senior Member since 1492
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From: Just because I'm paranoid doesn't mean people aren't out to get me...
St. Jude Donor '09
Difference between a Chevy 305 and a 350?
Isn't a 305 just a de-stroked 350? Are the heads interchangeable? Or does it depend on the year?
Burning Brakes
Joined: Nov 2001
Posts: 1,189
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From: Austin TX
Actually, the stroke is the same (3.48) and the bore size on the 305 is much smaller. The 305 has different heads with smaller combustion chambers and smaller intake valves so as to not overhang the smaller bore.
Racer
Joined: Oct 2006
Posts: 353
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From: Glendale AZ
A Chevy 305 has a 3.74" Bore with a 3.48" Stroke. A Chevy 350 has a 4.00" Bore and a 3.48" Stroke. So technically its just a smaller bore. The 305 heads are 53cc chambers and can be put on a 350 to increase compression, but at the minor expense of flow. Plus the 305 heads crack easily. The 350 heads come in either 64cc or 76cc chambers and would reduce compression if put on a 305, not a good combo for an already weak motor.
