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Old 09-08-2002, 09:50 AM
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Post SBC block grinding?

3970010 4-bolt

If you look down the bores to the top of the main webbing, there are small holes (the largest is about .25) where the tops of the inner main bolt holes are - I can barely see the ends of the inner main bolts. It's like this on 4 bolt holes and my machine shops says it's common and no big deal. Do I leave them alone or grind them smooth to eliminate possible cracks in the future? Of course if I grind I make the holes bigger and the block is fully machined and ready to go so I would hate to introduce all those metal particles to it. The engine will be 388 CI. Goal HP is 400 in a 1970 Chevelle street car. Thanks guys - you rule.

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Old 09-15-2002, 05:15 AM
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bump - it's been a week and I'm sure someone here can answer this...........

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Old 09-15-2002, 07:10 AM
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I would go ahead and debur this hole, just radius the edges and polish it smooth. At the 400 hp level, especially on the street, you won't have a problem if you don't do this, but deburring a sharp edge is always a good idea. You can always tell if a customer's car hooks up and makes good power when he brings the engine into freshen it up, hot ones that hook will form cracks in the bottom end. Usually where the main webbing meets the pan rail right in the corner, I used to radius this area and polish it smooth.I don't really remember the inner bolts cracking, but it doesn't hurt to smooth out jagged edges.
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Old 09-15-2002, 09:10 AM
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You can leave it if you want, deburring is a good idea so don't worry about enlarging the hole. Either way you can't hurt anything, I would just leave it if it meant I would have to clean the block again.
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