My large streetport engine is done and 'almost' ready to fire up with the GT35R.

The question is should I break in the engine (no boost for first 500 miles) with a set of B9EGV's in the leading and B10EGV's in the trailing?

Since all the internal parts are new i think it may take about 1000 to 1500 miles for a good break in on dyno juice and then switch to synthetic...

 

stocks plugs

 

Anything will work for breakin. We use Platinum 9's all the way around.

Jason

 

7s leading and 9s trailing (stock setup) is probably your best bet for the sissy driving that engine breakin calls for

 

Don't use the 10s for break in. You'll just foul them. Stock 7s and 9s or just all 9s will work fine.

 

i use whatever's laying around in the used bullshit bucket, then change them when it's time to tune.