Swapping X's for Trick Flows

That's theoretical on the lift at the valve. Remember with the small block, you lose .020" lift (give or take) due to the pushrod VS rocker arm angle. That's just a fact with the small block. Cain't get around it. Mike helped me set up the slant six head I never used. Got the rocker geometry just right with one of his shim kits. Great guy to deal with. I intend on using him again probably in the near future on my present slant six project.

I would "just guess" that Trick Flow probably "doesn't care" about whether the manifolds clear the heads. They probably figure anyone whose running aluminum heads also has headers.......but it would be kinda neat to have that option. I completely agree manifolds are way more permanent. They CAN be ported or extrude honed. So there's that.