Originally Posted by ap72
You're talking about taking advantage of volume pricing. Which is why shome shops specialize in certain heads, they can distribute the r&d costs among more customers and get each a better deal. However if its a one off application that advantage goes away. My olds heads were checked by a shop that specializes in fords, that doesn't mean he would have been any worse than if I sent them to mondello. It does mean it may take him a little longer. Since I ported them already on my own he just touched them up and the extra cost of shipping would have been greater.
What I stated above holds true regardless. If you want to take a head to a shop with no prior experience working that particular head- and pay for the learning curve, R&D, the endless hours of trial and error, the many castings that will be required to get to a point where there is an actual reproducible
across the board improvement- then that's fine w/me. Bring a big fat wallet and plan to be there for a long time.
There is just no valid reason to not take advantage of prior experience! I build a lot of carbs. Q-jets and Holleys in particular. If someone handed me a Dellorto, I could- eventually- come up w/a few things I'm sure would help it. After all, it's a carb, right? Has the same circuits, uses the same physics, etc. Given a couple dozen I would be better. After a hundred I might even be called something of an expert. Maybe. But would it compare to a Ducati specialist who's been using and reworking those carbs for years? I seriously doubt it, not in the performance, price or time required- unless those last two criteria were unlimited.
OT- Anyone who home ports
a head- by eye- w/no way of putting numbers to what is REALLY occurring is only fooling themselves. Good looks does not a good flowing port make. If you are going to pay to have a head ported, do all concerned a favor and supply them a good, unmolested casting and pay to have them do the work hopefully right the first time, instead of paying them to undo what has been done "because it looks right".
Taking an Olds head- first to a Ford expert, THEN follow that up w/a trip to Mondello- illustrates my point exactly. By your theory, the head should have been just as good coming back from the Ford shop as it will be coming back from Mondello. But obviously it didn't work out that way for you. So why recommend someone else do as you did and take that same chance of doubling the time and expense?
It just seems such a no brainer to take a head to an expert on that head instead of a generic shop or a specialist on another head.