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01-05-2013, 10:56 PM
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#1 |
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Registered User
 Join Date: Jun 2012
Location: farmington, nm
Posts: 80
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Question of the day? 307sb, timing chain and valves
The timing chain on my 307 sb broke today! What are the chances I hurt the valves????
Posted via Mobile Device Posted via Mobile Device |
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01-06-2013, 01:24 AM
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#2 |
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Registered User
Join Date: Oct 2012
Location: valley center,ca
Posts: 124
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Re: Question of the day? 307sb, timing chain and valves
Is it a stock motor or has the block been decked or heads milled or anything like that? If it is a stock type motor pretty good chance you didn't hurt the valves. If it a higher compression and parts have been modified for less clearance there is a possibility that you hurt them . I would at the very least do a leakdown test on the cylinders. But would be better off pulling the heads and actually looking at the valves and checking them out. Hth Dan.
Posted via Mobile Device
__________________
68 Chevy c10 longbed 307 with 305 H.O. heads,edelbrock performer intake,edelbrock performer plus cam,hei,Holley 650 double pumper and th400. Daily driver. It hauls butt,it hauls my butt where I need to go 
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01-06-2013, 01:44 AM
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#3 |
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Senior Member
Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,896
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Re: Question of the day? 307sb, timing chain and valves
I've never seen a stock SBC that damaged valves when the timing chain let loose.
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01-06-2013, 10:44 AM
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#4 |
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Registered User
Join Date: Oct 2008
Location: Marianna Arkansas
Posts: 7,269
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Re: Question of the day? 307sb, timing chain and valves
You asked for chances I'd say slim at best none at least. Time it up put a chain on it and fire it off for a 'nother couple hundred thou. Jim
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01-06-2013, 01:25 PM
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#5 |
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Registered User
Join Date: Jun 2012
Location: farmington, nm
Posts: 80
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Re: Question of the day? 307sb, timing chain and valves
It is a stocker 307...I feel a lot better now! Thanks guys
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01-06-2013, 01:31 PM
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#6 |
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Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,215
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Re: Question of the day? 307sb, timing chain and valves
I had a customers 307 that bent the valves one time. Ive had plenty that didnt. If it wiped out all the teeth on the plastic spocket you need to drop the pan & clean it out. I have seen them plug up the oil intake & ruin the engine.
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01-08-2013, 06:55 PM
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#7 |
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Registered User
Join Date: Jun 2012
Location: farmington, nm
Posts: 80
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Re: Question of the day? 307sb, timing chain and valves
well guys it was worse than i was expecting, nine total teeth broke and worse of all it hit the valves....sucks because i just got this truck a month ago! here's a picture and yes that is PICACHO!!!!
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