Differences between 305 and 350 engines
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Joined: Jan 2011
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Engine: 305 5.0 L
Differences between 305 and 350 engines
Hi I have a 1989 Camaro RS that I purchase a year ago. My question I believe the engine s a 350 How can I till the diffrent between the two engine 305 and 350? 
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Joined: Feb 2010
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From: Wichita, Kansas
Car: !991 RS Camaro
Engine: LS1
Transmission: 4L60E
Axle/Gears: 4.10 4th gen
re: Differences between 305 and 350 engines
They should say 5.0 or 5.7 in the back along the top of the bellhousing. If I remember correctly the 305 has a small diameter balancer that is close to 3 inches thick. A 350 balancer is larger in diameter and only about 2 inches thick. Someone correct me if I'm wrong about the balancers. Its been a while since I've had either one and I've had alot of 400's in that mix, lol. Good Luck
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From: morrow, ga
Car: 82 S10, 83 280ZX, 84 Z28
Engine: 355 smallblocks..na, 2.8 turbo
Transmission: 85:th350, 84:700R4
Axle/Gears: 85:ford9 4.85, 84:stock 3.24
re: Differences between 305 and 350 engines
The block casting number also...
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From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
re: Differences between 305 and 350 engines
Easiest way is the block casting number. Since the 305 and 350 have completely different bore diameters, they won't share the same casting. Visually looking at the engine, they look the same. If you're lucky, you can find a 5.0L or 5.7L cast into the block.
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
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Axle/Gears: 12B-3.73/9"-3.89
The last three digits of the casting number, which are sufficient to identify the casting, are usually cast into the side of the block in large numbers. Often easier to see than those on the back of the engine.
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Mar 5, 2017 06:37 PM
