Intake Manifold Thickness?

[Terry Cain]

Got a friend who runs a business restoring 67 Corvettes. 67's only.
He takes small block cars and does a retro to the 427/435 hp cars. Well, the 435 cars have a tri-power setup on them. He tried a Chinese made intake because the oem intakes are hard to find and very expensive. It took four Chinese intakes and going back through the motor because of a bad intake before he came across a good. JUNK nothing but JUNK.