The heads are cast with throat sizes that will accept 2.09 and 1.600 minimum valve sizes.  I have different programs for various valve sizes.  We run the cnc through all intake ports, on every head that is sold, just to touch up the port and keep the product consistent.  There is no worry of “core shift” when we do that.  There are areas that do not need to get any bigger, or be shaped any different.  Making the hole bigger isn’t necessarily better.  All of the transitions from cast to milled are blended nicely.  The places that need to be bigger, are such.  A lot of testing went into the port shape and design.  The cnc work that is done is done with results in mind. Making it bigger just so the program cleaned up completely would actually hurt more than help.  The poster might want to put those heads on an engine and test them before he gets too bent out of shape.  Might be surprised by the results if the rest of the engine is up to it.  He failed to mention that the valve job is perfect, and the blending from the seat insert to the cnc milling is also blended perfectly. 

To the poster:  If you are not happy, and you want to return the heads directly to me, I will refund your money in full, provided they are unscathed.  You will not be able to buy a better head for the price paid with better quality hardware, with a Medium Riser port location, than the head you just received.  I’ve been doing this a long time, with some modest success here and there.  That is high quality stuff you have there, whether it is obvious to you or not.  There is $800 worth of tool steel retainers, machined 10 degree locks, PAC solid roller springs, locators, blue Viton seals, shims, etc. included in that price you referenced. Again, if you want to return them, get in touch with me directly.

BP

The real question is, why are we just hearing about these bosses and why no pictures and dyno videos?😂😂

I guess I should have looked down the list before posting. Thanks again. good read by the way

Blunt statement. I WILL NEVER USE A CARBURETOR AGAIN.

My first car started life with a 2 barrel carb. ('53 Merc). As I started hot-rodding, I converted to 3 Stromberg 97s on an Offenhauser manifold. I learned a lot.

The next car was a '54 Customline, into which I installed a rebuilt '57 312. Over a period of time I went from a single 2 barrel to 3 2s, and then a factory race manifold with a pair of 4 barrels. Then I went to a Paxton VS 59 with a pair of bonnets on the carbs.

My next car was a new '64 Custom with a 427-T engine with a pair of Holleys.

A year later I got a new Mustang with the 'K' engine, and before long I'd installed the Paxton VS59 in an enclosure which required a Holley re-done by H. Droste who worked at Triple-E but was a Holley employee.

All of the above is to say that I've had LOTS of experience with carbs. I won't bother to detail my side excursions with DCOE Webers on a couple of occasions.

I've even had experience with mechanical FI, including one that was a daily driver for a couple of years.

And then, when Holley first came out with EFI designed to retrofit on a carbureted engine, I was Tech Editor-At-Large for Super Ford Magazine. I talked to their new EFI group, asking when they'd be coming out with a package for a fit on a dual-quad application. After saying it'd be several months, at least, they admitted the idea was on the back burner. I offered to be the guinea pig in putting things together---and write about the adventure.

We used Brother Lon's '67 Mustang as the test bed. It got a 427 TP engine when only a few months old, with components sourced from the LeMans GT 40 program. We received a surplus-to-requirements upper end that included a pair of heads, a dual-plane manifold, and a pair of well-tuned 652 mechanical-secondary Holley carbs designed for the combination.

Prior to the foray into EFI-land, we'd tried about as many pairs of different configuration Holleys on that car as possible. The ultimate arrangement of EFI throttle-bodies we tested and reported on was enough better in so many ways as to persuade me that the age of carburetion was past. How long has it been since a car came from a factory with a carb? Please see my opening statement.

KS

more parts added