did an engine swap in my 91 bird. dropped in a 350 with some vortec 305 heads casting 520. its gonna be running about 10.5-11:1 compression just wanted to see what kind of plugs i should get and what to gap them at....im running an hei dizzy with a 65k coil if that matters.

 

AC Delco Rapidfires or AC Delco Platinums for a 1996-2000 fullsize 1 ton van (G3500 or P3500). They are a slightly cooler plug than what is used in say a 1/2 ton truck with the same engine.

 

guess ill be using the ngk tr55 plugs they seem to be favored in my local car circle on high compression engines.

 

as long as they're the vortec reach, and a bit cooler. That's a pretty high compression ratio. I'd measure it if possible.

 

heatrange on them is 5 i think stock was 6 so they are a little cooler. and they are listed as a replacement plug on the orielly's website.