Q&A / Tech

Monday Mailbag: Troubleshooting Distributor Cap Meltdowns

Q: I have a 1976 Chevy Blazer with a 320 hp small block. It has a 600 cfm carburetor, MSD 6A ignition with an HEI adapter kit, and a heavy duty distributor cap and rotor. I keep melting a hole through the distributor cap, plus the center terminal (spring included) and the arc seal.

I swapped in an ACCEL Super Coil, but I still melted things.

What can I do to fix this? Also, what should the rpm at idle be?

A: There is an easy fix for your cap melting problem. MSD makes a low-resistance distributor bushing, part number MSD-8412. This little part should help keep things well below the meltdown point.

As for your rpm at idle, it should be around 700 or 800 rpm.

This is another in a series of weekly Q&A Mailbag sessions with Summit Racing‘s tech department, in which there are hundreds more. Click here to see them all

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