Which spark plugs ???

[BLACK MAGIC RACING]

I just aquired an off-center 274 cid stage 2 engine, and am not sure which plugs to use. please advise. Using stock coil pack and module, if that makes a difference...

 

[STP]

If you are using the Champions, the plug you need is a NGK TR5

 

[BLACK MAGIC RACING]

yeah, using alum. champions. thanks!!

 

[BLACK MAGIC RACING]

is there a delco equivalent? or do all stage motors run these plugs?