Originally Posted By RustyM
How much of what we see in these mismatches can be attributed to core shift and how much to manufacturers not matching intakes to heads?

Thanks for all the helpful info guys- appreciate all you share.


I consider it a missed opportunity by the mfgs to make extra money. If I sold CNC heads and I sold intake manifolds then the very least thing I would do is offer a CNC matching intake for an additional charge. The intake manifold already has to be in a machining center in order to surface the carb pad and drill and tap the bolts. Why not spend another 5 minutes of machine time and CNC the plenum for an extra $100 of revenue?

Indy will CNC their dual plan intake to MW size if you ask so they know how to do this work. No idea why they don't take the next step and provide a good port match on the rest of their intakes.