Re: 350 GM Crate Motor questions for a 66 C10
There is no reason to not use your original engine mounts and the frame brackets. The L31 is still a Gen I small block. It is physically exactly the same as the old engine you had. You also do not have to buy ARP bolts. You can also simply go to your local hardware store and buy the correct size of grade 8 bolts, washers and nuts if needed.
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