I just replaced a point type distributor into a 307 CI. which has 13mm plugs, what type, gap, and brand is everyone using. This is a stock 307 chevy with a 3 sp. in a 61 Bel-air

I ran AC R45TS plugs in my '72 307 motor. If your heads have tapered spark plug seats you can use the above plugs. I don't see a problem with running them with the HEI. Maybe the gap can be slightly larger w/ HEI.

Open your plug gap to .045 for the HEI.

You made sure that your HEI had 12 volrs going to it, right?

__________________
Home Handyman Forum I Shade Tree Mechanic Forum

For lower compression you can probably run up to .055", but there is no need. Voltage will be fine anywhere from .040 to .055. I personally gap mine to .045"

10-4 on the 14 AWG from the distributor to the switched side of the fuse block
.
I will be off to Pimp Boys tomorrow to look for some AC R45TS or maybe some Dinso U-Grove or anything i can fine that is in the heat range of a R45.
By the way is a 43 hotter or colder plug?

The higher the number, the hotter it is.

__________________
Home Handyman Forum I Shade Tree Mechanic Forum

Doc here,

Don't forget to upgrade your Plug wires to an 8 or 8.5 Spiral core wires from the stock wires..or you'll have misfires, cross fires and RFI like a big Dawg..


Also assuming you removed the Ballast wire / Resistor from the circuit..else it will run like a muni bus if at all


Doc

__________________
Aftermarket Solutions
Electronic & Electrical
Innovations

Thanks all , yes I have rewired the HEI straight to the fuse box (Switched) and the wires were off of a running Camaro the same place I removed the distributor from.