I am so confused, i just want a high(er) performance HEI in my 1984 L69 Vin code G camaro. Right now im running a stock HEI with an accel coil. I have been tryin to buy an MSD upgrade, but I dont even know what to buy because I dont know what type of HEI module I have. Is it a 4,5, or 7 PIN? and how do i check... whats a pin? Most of these upgrades are for 4 pin, and some five pin. PLEASE help, thank you.

 

They're refering to the number of pins on the ignition module. Not sure what your car came with stock, you could tell pretty easy by popin the dist cap off and countin the num of connections on the module.

 

4 pin:



7 pin:



etc.

 

Don't the external coil dizzys use an 8 pin module?

 

Hey z28cmr83,

If you want a 4 or 7 PIN Accell Module let me know. Gotta couple for sale.

 

The coil-in-cap CC HEI uses the 7 pin type as pictured above.

 

What makes it a upgrade froma 7 pin to a 4 or 5 pin why is this better and does it change anything else. Just a couple of questions that poped in my head

 

??? where'd ya get that from? The diff num of pins are for different dists over the years, CC dist, vac advance dist, etc.

 

4 pin = original coil-in-cap HEI (no computer)

7 pin = computer-controlled coil-in-cap HEI

8 pin = external-coil small-cap HEI (87 up)

You don't "upgrade" by changing the number of pins. You get one with the number of pins that your system requires, and an "upgrade" would consist of one that has superior electrical properties in some way (usually lower "on" resistance and wider pulse width).