I’m thinking factory gap on the rings and it’s boosted. It has the Roush tune so it’s conservative. Funny it happen only a couple thousand miles after the warranty ended
So I always had trust issue with mechanics, and not being able to do things, right. I’ve been working on vehicles with my dad since I was about eight. So I bought the car off my brother-in-law and about two months later check engine light came on low compression cylinder five. About the build...