Question of the day? 307sb, timing chain and valves

[93redsled]

The timing chain on my 307 sb broke today! What are the chances I hurt the valves????
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[dlh760]

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.
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[truckster]

I've never seen a stock SBC that damaged valves when the timing chain let loose.

[hugger6933]

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

[93redsled]

It is a stocker 307...I feel a lot better now! Thanks guys
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[Wrenchbender Ret]

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.

[93redsled]

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!!!!