Ok guys, I know I have read this question on here somewhere, but I can't find the answer. The question concerns engine blocks that were made either at Flint or Tonawanda. Which block had the large plugs in the front under the timing cover? Or did both plants have the plugs? What were the plugs for? I hope someone can answer...?
3892657 block plugs
67CruiseMasterCamaro
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Ok guys, I know I have read this question on here somewhere, but I can't find the answer. The question concerns engine blocks that were made either at Flint or Tonawanda. Which block had the large plugs in the front under the timing cover? Or did both plants have the plugs? What were the plugs for? I hope someone can answer...?
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No one knows the answers?
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The plugs are about 1" in diameter on the front of the block and are just like pipe threaded plugs. Also, did Los Angeles cars get a Flint or Tonawanda block?
Could you mean the oil drain-back holes? They're at about 10 and 2 o-clock (with the cam at the center). They shouldn't have any plugs in them.
Engines could have come from either plant. I think the majority of big blocks were Tonowanda, and small blocks were Flint.
Engines could have come from either plant. I think the majority of big blocks were Tonowanda, and small blocks were Flint.
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I know of the oil holes, which are plugged when using a solid lift cam. I am talking about the 1" plugs that are just to the right and left of where the cam sits in the block. There is a picture of the plugs I am talking about in the Chevrolet By the Numbers Book 1965-1969 page 72 top photo. The plugs can be seen on the front of the block there.
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Flint and Tonawanda small-blocks all had the same casting core plugs; the only difference is the square-head 1/8" NPT plug just above the timing cover at 11 o'clock on a Flint block; Tonawanda blocks didn't have it.
![Image]()
Both engine plants shipped small-blocks to both assembly plants, and Tonawanda was the sole source for big-block engines.
![Image]()
Both engine plants shipped small-blocks to both assembly plants, and Tonawanda was the sole source for big-block engines.
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