Re: 1986 crate motor
The 86 was a transition year as mentioned.
1 piece rear seal but old style intake mount..and mech fuel pump.
We used lots of the 86 GM service replacement motors because you would get the 1 pc rear seal....no more rear oil seal leaks ...but could use the old style intake and a mechanical pump.
All you have to do is use the i pc flywheel/flex plate and it fits back to 1955.
The part # in my files is 12568759 for a brand new long block.
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