Howdy folks
Im Currently running my LNF on E50 and 25 psi on the stock turbo. I’m planning to run some autocross events in spring-fall 2025 and then either LS swap ( ideal but expensive) or swap in a built LNF and efr turbo. If I can’t swing the LS and go the built LNF route what engine builder is the overall best option for these motors?

car is a 09 Solstice GXP

 

You can run a 7163 and make 500hp+ on a LNF with a stock bottom end. For autocross you'd probably be better sticking with the K04 for the faster spool. I plan on racing my LNF with a 71 but will be taking it to a track not auto cross.

 

LS would be quite a lot of work, and additional weight. Although obviously they can make lots of power for very cheap

What do you need from the car in terms of power ? rpm range ? etc etc Can that be achieved with the 4cyl engine ? ( I would say likely yes ). Would additional weight up front hurt the car much for your usage ?

How much power are you currently making and where is it lacking ?

I guess ZZP would have to be an obvious first choice ?

I see these guys recently on FB too, BK Racing Inc, ( forum might block the FB page ), they seem mostly n/a racers, but offer some good parts https://www.facebook.com/BKracinginc/
But no doubt there are many many other builders