[Ajram78]

I'm doing a first time tune up on my 78. It has a big block. Can anyone tell me what should gap the spark plugs at? Are there any contributing factors that I need to know in order to determine this?

 

[Philip]

The type of ignition and the casting numbers on the heads will be needed to know the gap and type of plug, gasket seat or tapered seat.
After that the commissioner ratio and cam profile will help but not needed.
What number and brand of plug are installed now and how do they look?

 

[balljoint]

The type of ignition and the casting numbers on the heads will be needed to know the gap and type of plug, gasket seat or tapered seat.
After that the commissioner ratio and cam profile will help but not needed.
What number and brand of plug are installed now and how do they look?

commissioner ratio

 

[Pandora's Box]

The type of ignition and the casting numbers on the heads will be needed to know the gap and type of plug, gasket seat or tapered seat.
After that the commissioner ratio and cam profile will help but not needed.
What number and brand of plug are installed now and how do they look?

commissioner ratio

:rotfl: :rotfl: :rotfl:

Okay Philip... you've got some 'splainin to do!

 

[Philip]

commissioner ratio

Stupid autocorrect

COMPRESSION RATIO

 

[Pandora's Box]

Stupid autocorrect

 

[Philip]

hey it was ...don't give me those eyes

 

[Pandora's Box]

hey it was ...don't give me those eyes

I suppose it beats blamin' the wife, the kids or the dog!

 

[mud.man.rj]

plug gap

All big blocks are gapped @ .045 and have a tappered seat plug.