What Plugs for TF 240

Getting ready to fire up the 512 to break in the cam. Whats a good plug to start with for the TF 240s. 512 pump gas 10.3 comp.

I'm using Autolite 3924 in my 448 (.040 over 440) that has 10.9:1 compression with TF 240. I'm running a mixture of 2:3 race gas (110) to pump gas (93).

A 7 or 8 heat range NGK should work fine. Street use a 7 and strip the 8.

For a street car on pump gas I'd use NGK 6987. That is a #6 plug with extra extended tip and an extra wide gap. It is an OEM plug used in new cars.

Thanks for the replies. I appreciate it.