View single post by Esprit2
 Posted: 01-17-2021 08:52 pm
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Esprit2

 

Joined: 05-01-2005
Location: Minneapolis, Minnesota USA
Posts: 575
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 The 'heads' of the 23D4 & 25D4 are small in diameter, and that puts the spark plug terminals close together. If you upgrade to a higher voltage coil, then there's a very good chance that the extra voltage will just arc between the terminals inside the distributor cap. Those small distributors are simply not compatible with high-voltage coils... period.

If you're going to the trouble and expense of replacing the distributor, then consider upgrading to the later 43D4 or 45D4. They're larger in diameter, and can handle hotter coils.

Regards,
Tim Engel

Last edited on 01-18-2021 08:07 pm by Esprit2