jtmustang

what he said above for me too

stang8689

Thanks guys what what is different between 3924, and 764?

mjr46

not sure..you'd have to see if they cross and reference to the same plug

94StinkinLincoln

edelbrock rpms use stock plugs, which i believe is the 24's or 25's

AdderMk2

The specs on the Autolight 3924's is as follows:

Heat Range Chart Location D11
Hex 5/8"
Reach 3/4"
Resistor/Non-Resistor/Suppressor Suppressor
Seat Gasket
Thread Diameter 14MM
Tip Power


While the Autolite 764's specs are

Heat Range Chart Location D15
Hex 5/8"
Reach .708"
Resistor/Non-Resistor/Suppressor Suppressor
Seat Tapered
Thread Diameter 14MM
Tip Power

So as you can see, the major differences are the seat style, heat range, and a ever so slight (.042") difference in the reach.

PJC Racing

Stinkin, you should be running #3924's with those heads. Edelbrock actualy recommends Champion (total junk) and the the part number they say to use crosses over to Autolite #3924.