spark plug options
 

Time to put a fresh set of plugs in the 70 TH400 L78 car...stock motor, good fuel.

Just wondering what you folks like for this...

Thanks, wilma

could be wrong -- was'nt 70 a transition year from gasket to taperseat ? so becareful

Spark Plugs..
 

Yes...the small 5/8" peanut plugs with tapered seat are the ones in this car. 291 rectangular port heads...

What does the owner's manual call for

NGK is what I use in my L78.

I use: NGK 2635 GR4 V-Power Spark Plug
for my 1968 L78
Not a tapered set up.
There must be a tapered version.

I used recommended brands like AC, Autolite, Champion. All would foul after a short time of use. Changed to NGK and no problem.

What is the AC spark plug number that is listed in the owner's manual

Just bought a fresh set of NGK’s for my 291-head’ed LS6 last week so here ‘ya go.

Spark plugs..
 

That's great...just the info I needed. Will hit the parts store tomorrow.

Thanks :beers: