I just got my Nitto 421's put on on Friday and broke them in by towing a 6000lb travel trailer to a place 150 miles away. I'm trying to find the time to install my Walbro 400 and then do some more dyno tuning for the top end, maybe I'll get a race tune done for 94 octane plus a couple of gallons of 100LL avgas as well.

At the moment I just have a stock tank pump and the Walbro inline 255. My race weight is around 5300lbs.

 

Does your fuel pressure drop at the top end?

I'm curious to see what you think of the new tires