a motor my proffeser refered to as a fordhemi

[FFR428]

I also heard shorty after MT unveiled his hemi heads Ford then came out with the sohc cammer which put quite a damper on the spotlight from Mickeys newly develpoed heads. They really never caught on after that. If indeed the cammer production had been stalled I'd bet you'd see a lot more of those heads in circulation. That ebay auction was pretty cool tho and interesting to see those heads. Still all in all really rare to have.

G.

[olddog]

Originally Posted by Power Surge

Also, Ford's 4.6 DOHC (DUAL overhead cam) motor is a hemi. It's a modern version, with 4 vales per cylinder, and a central plug. You could use that for your paper to tie old technology vs new.

Although the 4.6 DOHC reminds you of a hemi, it is not. I believe the technical term is PENTROOF, but I would have to pull a book to be certain. A hemi head is shaped like a ball (top half) except where the valves are flat. That is to say there are no flat surfaces on a hemi head. The 4.6 DOHC has all flat surfaces (except the curve to match the cylinder wall). The valves are not nearly as canted as a hemi either. However the flow is excellent, and from an emissions/performance point of view it is superior to the hemi in many ways.

[Excaliber]

Superior to the Hemi? Impossible! And nothing is faster than a Cobra, NOTHING!

...got that straightened out.

[Woodz428]

Originally Posted by wboss429

Boss 429 Is A Hemi,......... But At The Time Ford Never Called It One,, Ford Did Not Want It Confused With The 426 Dodge,and The Cammer Is A Hemi,the Simi Hemi Is The Quench Boss Head,but Still A Hemi,if You Search Ford Arkives You Will Find All Of This Info,

Hate to break your delusion, BUT the Boss 429 was a twisted and clipped Hemi, not a true Hemi as you indicate. As, I believe Excalibur said, a true Hemi is designated by combustion chammber shape. As in HEMIsphere, meaning half a sphere. So there is no way that a Boss, while a nice engine, is considered a Hemi, except in the very broadest of terms. I also think that the 426, is not a full Hemi either, if you placed to chambers together they woul make less than a full sphere. Regardless of what Ford may have said/do say, the definition was not created by them. There have been Hemi heads in lots of appplications though, including such varied beasts as the Fiat,Alfa,Jaguar and Triumph motorcycles. There are many more but these are just a few off the top of my head...TRUE Hemi's.
An I hate to be so picky...but PROFESSOR is spelled just as I spelled it not proffeser as the questioner did. Your proffeser may be impressed, but your Professor would probably not.

[Woodz428]

Originally Posted by olddog

Although the 4.6 DOHC reminds you of a hemi, it is not. I believe the technical term is PENTROOF,

I think that you are correct. Pentroof is probably what the 4 valve Mod motor is, as were the DOHC indy engines and literally every new sportbike engine.

[wboss429]

Originally Posted by Woodz428

Hate to break your delusion, BUT the Boss 429 was a twisted and clipped Hemi, not a true Hemi as you indicate. As, I believe Excalibur said, a true Hemi is designated by combustion chammber shape. As in HEMIsphere, meaning half a sphere. So there is no way that a Boss, while a nice engine, is considered a Hemi, except in the very broadest of terms. I also think that the 426, is not a full Hemi either, if you placed to chambers together they woul make less than a full sphere. Regardless of what Ford may have said/do say, the definition was not created by them. There have been Hemi heads in lots of appplications though, including such varied beasts as the Fiat,Alfa,Jaguar and Triumph motorcycles. There are many more but these are just a few off the top of my head...TRUE Hemi's.
An I hate to be so picky...but PROFESSOR is spelled just as I spelled it not proffeser as the questioner did. Your proffeser may be impressed, but your Professor would probably not.

the boss nine head could be either way, i have owned more than a few,and 1 of the things i do for a living is rebuild,and restore boss 429 engines,please do R & D ON THIS,THERE IS FULL HEMI,AND SEMI QUENCH ,AND THE AR HEAD IS FULL HEMI,DOESNT COME ANY OTHERE WAY,THANKS, A441,A442 <HARDEST TO FIND,OR NOW THE B441 HEAD, THIS IS NOTHING TO DO WITH WHAT FORD SAID,IT IS A HEMI..

[Woodz428]

Originally Posted by wboss429

,THERE IS FULL HEMI,AND SEMI QUENCH ,AND THE AR HEAD IS FULL HEMI,DOESNT COME ANY OTHERE WAY,THANKS, A441,A442 <HARDEST TO FIND,OR NOW THE B441 HEAD, THIS IS NOTHING TO DO WITH WHAT FORD SAID,IT IS A HEMI..

Yes,yes,yes, however the discussion originated around production engines of which the Boss 429 production engine WAS NOT a Hemi.If you RESTORE Boss 429s, as you imply, you would never put Hemi heads on one because you would screw up a Restoration.Might want to check out what "restore" means. The reasons those later AFTERMARKET heads became Hemis was because the Boss 429 ones didn't work as well.Plain and simple. Did my research when they were new and when those late ones came out, it's easier to keep up than to catch up. So, unless there are some unknown Production Boss 429 Hemi head in the 1000(est.) combined total production Mustangs, that they only came in. You made my point for me..Thanks.