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Opinion on this 350

hunterguy86

hunterguy86

1/2 ton status
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Jan 10, 2005
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I'm thinking about picking up a 4 bolt main 350 that has been bored .30 over. The block and everthing seems ok except for one cylinder. The valve spring broke allowing the valve to fall down into the cylinder and make contact with the piston. Even though that cylinder was not working properly, the engine still ran great. Pics of the piston are below.

Also I would guess that since the valve spring broke I need to go through the heads. Would it be cheaper to rebuild the heads or get a set of new ones?

I found these heads on summit. Would they be good for a mudder/DD?

How about this for an intake?

I'm sure the cam got trashed when the valve spring broke. How about this for a replacement cam?

Here are some pics of the piston.
DSC01957.jpg


DSC01956.jpg
 
so it would be ok to run it with the piston like that? I know the damage isnt that bad but would it weaken the piston any?
 
i'd say if you're pulling the heads, anyway, replace at least that one piston while you're in there. it would just be more hassle later, when it had to be done anyway. it's hard to see just how bad the damage is from that pic, but it could cause stress risers or allow uneven heating on the metal.
 
Where did the broken valve head go? Into the head?
The heads, intake and CompCam look good.
I would recommend dis-assemble the whole engine, clean, inspect and reassemble with old parts that are serviceable = replacements and new gaskets, etc.
 
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