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As I upgrade my 88 I am using the parts to build for my 69 do I need a new block to build another engine?
 

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88 heads will bolt to a '69 302 block, but not a 351 block. The head bolts are bigger on the 351.
 

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They'll bolt right on, you don't need another block.

If you're wanting to put them onto a 351, you'd have to drill out the holes to 1/2 inch but that's all it'd require.
 
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