Thread: common problems with log manifolds

X10! Very few would say/do this.....

We swapped a full de motor with bc stage 2 cams to a Vvl head (he misshifted and broke the rocker arms and valves) and gained only 27whp at 20 psi over the de head with bc cams.

That's going to be hard to do. Look up Coheed's build to get an idea.



Either 2.0 cams or VET cams, VET cams are much more log friendly (13* of overlap which is almost as low as regular SR20's).

De head with log isn't bad, ve head with log blows peen

Simple Solution! DE All the way

Great topic tubular vs log. What about the cracking that happens with these tubular manies? The cast iron manifolds never crack.

Tubulars if made with the proper Schedule Stainless and proper welds/bracing will hold up just fine

I've yet to see a "custom" tubular mani crack. The ebay tubular love to crack though...

what manifold and turbo?

Those gains were on a log manifold and 57mm Garrett turbo. Once he went with a tubular I made him he gained more power at less boost.vvl head swap gains are ridiculous when you have a good flowing setup.