I agree with Kenyon. I have a high-speed ND starter on my '71 Imperial, but this engine was rebuilt with higher compression than stock, so I like the fast spin of the ND starter.I put a ND on my 66 to see. Its' high-pitched sound reminds me of the starter on my motorcycle and other small cars. To be fair, that's its lineage, but it doesn't sound like a real imperial.