1927 Pontiac 6 tune up specs

[boler76]

Could some one supply me with engine tune up specs,,, timing, point and plug gap, plug make and # and any other data that is available would be greatly appreciated Thanks

[mlander]

Quote from :boler76

Could some one supply me with engine tune up specs,,, timing, point and plug gap, plug make and # and any other data that is available would be greatly appreciated Thanks

1927 Pontiac 6, sparkplug GM AC-78 .025? Distributor gap .022?

The sparkplug above is listed as original equipment and is a 7/8?-18 threads per inch with a heat range number of 6.

One source for Champion numbers is at;

http://www.antiquetractors.com/Research/Spark_Plug_List.htm

They list the Champion number as W-20. I just bought a Champion # W-18 and it is one BIG sparkplug it must weight twice as much as an ordinary 14mm plug.

It has an extended skirt and a reach of 9/16? measured at the thread run out area.

I have never seen a W-20 nor an AC-78

The Autolite book claims the number is 3076

I will on Tuesday get an AC-78 just to see how much difference it is from the other two! I am very curious.

Yours M. L. Anderson

[Guest]

If you cannost find plugs locally I have a couple of sets of Autolite plugs on hand.

[boler76]

I thank you for the info, will see what I can find here in Thessalon On Can or the extended neighbourhood

[mlander]

Just got back from my local friendly NAPA dealer and found that the GM AC-78 may not be available but the AC 78S which is an extended tip plug is available ( I think).

[mlander]

Just got back from my local friendly NAPA dealer and found that the GM AC-78 may not be available but the AC 78S which is an extended tip plug is available ( I think). M.L. Anderson