420a 110lsa?
 

At least with V8s, 114 seems to be the popular LSA with boosted apps, so that youre not blowing boost out of the exhaust.

But the only turbo cams with decent lift and duration we can find for my friends I4 Avenger have a 110LSA. And it even says in the desc. that these cams reduce overlap for boosted apps. So what gives? Is 114 not a universal truth for boosted apps?

You can use a 110 LSA. The old E303 cam I had in the Cobra with the 302 had a 110 LSA and it ran great. Though a 114 LSA will have a smoother idle, cleaner emissions and pull more vacuum. The new cam I'm installing in the Cobra now has a 114 LSA but the .050 duration is only 212/218. However that's about as much as I can go now and still pass tailpipe emissions.

Tell us more about the engine and what he plans to do with it.

My cam is a 110 LSA too, but the consensus seemed to be that it was costing me a lot of hp. You dont think its so substantial?

In my opinion a 110 is not giving up that much over a 114. Where he will feel it the most is in the lower RPM torque.

For forced induction the closer to 114 lsa the better.

The theory is that the 110 LSA bleeds off the boost but I can tell you that on my Cobra the boost didn't change going from the 302 with the 110 to the 347 with the 114. They both hit 11-12psi.

It could be argued that the 110 was bleeding off boost with the 302 as the 347 should show less boost because of the increased displacement.

sbc and sbf guys have been running 110 boosted applications for decades. Shit, tons of mustang guys running 117-119 on turbo applications.

Ya, so then... all motors the same when it comes to LSA?

He is planning to buy adjustable cam gears to compensate. It must suck having limited options.

Port velocity, quench, efficiency etc etc etc Is motor stuff, not brand stuff.

Is this a single cam engine or dual cams? If it's dual cams then I believe he can adjust the LSA.