dmracing

iTrader: (78)

This isnt a LS, but Im at a loss. I dont know if Im over looking something. Here's what going on. I built a 406 SBC gen 1 and its running. Sounds good, no smoking. I decided to pull the plugs just to look at them amd the outer 4 cylinder are running rich. They dark and dry, not wet. the inner 4 plugs are grayish. Look right, but the outers look rick. What do you guys think is going on?

ZONES89RS

iTrader: (25)

What intake? Common for some I takes to cause distribution problems. Especially the older intakes.

dmracing

iTrader: (78)

Its a copy of the Dart. The hurricane. It ran fine on the 383 it was on

LXguy

iTrader: (5)

Brand new motor? Was it started and run around the block a couple of times or just idled?

Did you get it fully warmed up?

Same fuel as you used before? Same plugs?

dmracing

iTrader: (78)

same fuel, same plugs. Idled in garage. It did get fully warm

LXguy

iTrader: (5)

I'm assuming you've tuned the idle screws in for the new motor. Does the carb have 4 corner idle?

It might want a little more initial timing.

If your A/F (or vacuum gauge if you set it up the old-timey way) looks good, and if they're not dripping wet or fouled I wouldn't worry about it until you can run it around a little bit.