.460 vs .708 spark plugs in vortec heads

[fowjacob]

I'm asking because I have flat top pistons and don't want to the piston to hit the spark plugs

 

[Jims86]

I'm asking because I have flat top pistons and don't want to the piston to hit the spark plugs

Why flat tops?

 

[fowjacob]

Why flat tops?

More compression

 

[Jims86]

More compression

Hmmm....
Whats the primary use of the truck?

 

[fowjacob]

Hmmm....
Whats the primary use of the truck?

Daily driver

But a vortec head calls for a .708 and a stock head calls for a .460 but I have flat top pistons and don't want a hole in my piston if the plug is to long

 

[Jims86]

Daily driver

But a vortec head calls for a .708 and a stock head calls for a .460 but I have flat top pistons and don't want a hole in my piston if the plug is to long

If your valves clear, a standard plug should. Pligs usually dont protrude out of the combustion chamber. Did you have the heads milled?

 

[fowjacob]

If your valves clear, a standard plug should. Pligs usually dont protrude out of the combustion chamber. Did you have the heads milled?

no because they were brand new when i put them on

 

[Jims86]

no because they were brand new when i put them on

I think the valves would hit the piston before the plug. Did you put clay on the piston to check clearance before you put the heads on?

 

[fowjacob]

I think the valves would hit the piston before the plug. Did you put clay on the piston to check clearance before you put the heads on?

no i think im just going to go with the .708 plugs sense that what the vortec calls for

forum.73-87chevytrucks.com/smforum/index.php?topic=17803.0

 

[Jims86]

no i think im just going to go with the .708 plugs sense that what the vortec calls for

forum.73-87chevytrucks.com/smforum/index.php?topic=17803.0

You shouldnt have a problem. I have not seen stock Vortec plugs protrude passsed the inside combustion chamber surface.

 

[fowjacob]

You shouldnt have a problem. I have not seen stock Vortec plugs protrude passsed the inside combustion chamber surface.

Thanks Jim

 

[1low4x4]

Any feedback on this fowjacob?

 

[1984dually]

Tried the short plugs in a set and it didn't run very good. Use the plugs for the vortec heads