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Old 03-07-2004, 03:11 PM
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Chevy 305 bad cylinders

Well I ran a compression test on the monte carlo cause I was curious and all the cylinders had between 145-155 psi except two. One had 60 and the other 80.

Want some opinions to what could cause this on a 305 with 212,000 miles on it. I'm pretty sure it's bad valves/seats, or adjusting, but want some opinions.

There is also no, or little blow-by. so the rings should still be in good shape. Saw some exhaust in the intake as well, but could have been vaporized gas I guess.

Thanks.

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Old 03-07-2004, 04:28 PM
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Are the 2 cylinders side by side?....if so, I would guess a bad head gasket.

Does it seem to have a miss?
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Old 03-07-2004, 04:38 PM
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no, they are on oppisite sides of the block. No water or coolant in oil.

I think it was cyl. number 6 and 7. Also got a 305 I just might pick up for $25.00 with 120,000 miles on it. I just dont want to drive 120 miles to pick it up I think my isuzu has had enough abuse.
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Old 03-07-2004, 05:58 PM
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put a 350 in it.
hell i got a 350 block you can have
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Old 03-07-2004, 06:09 PM
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It is probably bad rings as well as the valve guides. Don't assume that rebuilding the heads will fix the problem. I almost guarantee the compression will still be low after a head rebuild.
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Old 03-07-2004, 06:10 PM
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after that many miles why just do the heads?
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Old 03-07-2004, 06:47 PM
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Whew, 212,000 miles? I think I'd bend over and kiss that motor and send it to small block Heaven! You be on borrowed time my friend. Timing chain was stretched too far by 100,000 miles,valve/seats/guides gone about 25,000-75,000 miles further,bearing and cam getting "thin"....treat it like a girlfriend that got really fat....walk away on good terms.
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Old 03-07-2004, 07:18 PM
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haha well put
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Old 03-07-2004, 07:43 PM
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why is it always good terms with the fat ones and bad terms with the skinny ones??
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Old 03-07-2004, 08:16 PM
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I know the car seems to need some work, but I for what you bought the thing for, its worth it. If that car has a strait body, throw a shift kit in the tranny, build a 350 (or better yet a 383 or 400) for it and do the little stuff that it needs!

Forget the 305, if you want one really bad you can buy mine off me! Its got a bigger cam, later heads, a bigger cam and a nice intake!

K
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Old 03-07-2004, 08:25 PM
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i'll keep that in mind my boat does need an anchor.
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