ford hemi heads

I've been reading all day long about the hemi heads lots of good info my question is I have yeaht to find some flow#'s or any specific info about them? What cubic inch is the a-441 heads recommended for? Are all the c-441 heads 5" bore space? Do they still offer a b-441? I'm wanting to start gathering info to possibly start a new build. Need 1400hp with single carb with a cast block is it even possible or am I better off with a Thor or e- head? Thanks guys I'm starting to see crossed eyed from looking on the computer lol....

Eric, I remember a couple of truck pull guys that did some A441 640 cube deals that were over 1300hp, but it's been a couple years ago. I don't think the Thor's or E's will get to that 1400 mark either. The B441's are a lot of head and need a lot of cubes under them to perform. Not sure of exact numbers on flow, but IIRC the A441's will go over 600 cfm on the intake side when done by a competent shop. How large of an engine are you thinking?

How big of a crank can I get in a premier block..lol definitely putting deck plates on it so the rod ratio will work and keep the piston speed down.

I was looking around on jons page he offers the a-441 but I was talking to a guy via text mess earlier today and he said the Thor will out perform the a-441 head??

fatal addiction wrote:How big of a crank can I get in a premier block..lol definitely putting deck plates on it so the rod ratio will work and keep the piston speed down.

5.35 with an aluminum rod. Lots of surgery...
With deck plates and 8 sleeves...727"
Scary...but is on season 2 and winning races.
Keith

Cool that's some incouragement..what heads? I'm thinking about using 2"thick aluminum for deck plates what u use?

fatal addiction wrote:Cool that's some incouragement..what heads? I'm thinking about using 2"thick aluminum for deck plates what u use?

A real nice pair of GenII Thors....too many PBRs to recall plate thickness. Maybe 1.2 to 1.5". Not 2.
The ESI deal was cast iron plates.
I was sure that it would be a leaker....it is dry as a bone. This is a full boogie BBF for sure, but still very basic.
Has over 1.00" lift...idles like a street rod engine.
A hair over 1320 HP with a real big $$ single gas carb.
I kinda borrowed the carb for a pull on the old KFM 618 Interceptor.
Keith

My dad has a 632 gen ll we are running now but the thors are hard to get and I've always wanted a hemi..lol anyways the reason I said 2" deck plates is so the machine shop can clean up the deck to 12" hopefully I can find a eliminator block with a split cylinder wall or 2 hate to buy a new block and put 8 sleeves in it..lol

fatal addiction wrote:My dad has a 632 gen ll we are running now but the thors are hard to get and I've always wanted a hemi..lol anyways the reason I said 2" deck plates is so the machine shop can clean up the deck to 12" hopefully I can find a eliminator block with a split cylinder wall or 2 hate to buy a new block and put 8 sleeves in it..lol

Where you located?

contact Boss429 on here he makes north of that mark na with A441s and has a lot of experience with the ford hemis.

Northwest Ohio

Does anybody know if the idt 1600 series head is available yeaht?

fatal addiction wrote:Does anybody know if the idt 1600 series head is available yeaht?

I've had my hands on a set of the 1500 series and done some work to them. To the best of my knowledge 3 sets have been made and are out there in the hands of customers. The special valve covers still have not been made, although there are CAD drawings for them.

As for the 1600 series, I do not know of any guys who have them.

Charlie

Steve Vance just told me he done a set. Waiting to hear some results from him!! Thanks charlie..

Im no expert, but will share what I do know.

The A-441 heads are not nearly the same as the B/C heads. The A heads are noticeably smaller, and seem to be used with blower application.

The B/C heads are in fact 5" bore space heads, and are used on the mountain motors. All numbers I have heard, have been between 650-700 CFM. They are physically huge in comparison to most other heads. They will make lots of power, but are extremely expensive.

The B/C heads flow big numbers, but as mentioned earlier, you can only build so many cubic inches with an iron block.

Thanks I was under the impression that the b heads was much bigger than the a but was still 4.9 bore space? Thanks again...

Does anybody know where to find some pics of the b441 head I've been looking all over the internet and can't find a single pic..lol Thanks

These are B-441 heads. 5" BS, on our 816" motor.

Awesome bullet Thanks for the pics..

From what I've seen, A441 heads are 4.9 BS low port heads while the B441(4.9 BS) and C441(5.0 BS) are the Roberts designed heads and are way taller. From everything I've heard is the 4.9 BS Roberts heads (B441) are very very rare to find used but for a LOT of $ you can get new ones from C&C.

I'm pretty sure both B and C heads are 5" BS. The C's are somewhat of a "revision" of the B's if I understand correctly.
As mentioned, the A heads are MUCH thinner from block surface to valve cover rail...probably half as thick as the B/C heads.
They are under very expensive....$30k plus for a new set. Used set can be had for $20-24k if you can find anyone who has them. We just went through the headache of finding heads and being shocked at the price. Gotta do what ya gotta do though.

Filucky wrote:From what I've seen, A441 heads are 4.9 BS low port heads while the B441(4.9 BS) and C441(5.0 BS) are the Roberts designed heads and are way taller. From everything I've heard is the 4.9 BS Roberts heads (B441) are very very rare to find used but for a LOT of $ you can get new ones from C&C.

This is correct.

What about Indy Boss Hemi Heads? Anyone know anything about them? There is someone down the road from me that upgraded from iron CJ stuff to billet Indy heads, probably around 1998 or so. At the time he told me his were the 1st or 2nd set on the East coast. They are in a rail chassis mudrunner with a 10 or 12-71 blower, injector hat, lenco(I think 2 speed) mag. ignition set up, A460 block, etc. Supposed to be over 600".
 Anyway every time I see him he tells me he wants to sell it, it's just setting on the ceiling joists in his shop, over his office(the whole car) .
I honestly think he is a little scared of it after the switch from his previous set up, he had this get away from him once at the end of a pass and hit some crushed cars some monster trucks had ran over, (stuck throttle) launched him airborne and hasn't used it too much since.
Sheldon G.

fatal addiction wrote:Steve Vance just told me he done a set. Waiting to hear some results from him!! Thanks charlie..

Steve Vance also did a E head 600 cube . IRC , it was in the mid 1300HP .
 
that engine had a C460 intake , more mods or a sheet metal might have got him 1400 .
 
ask him about it

My 4.9 bore space motor has B441s on it[just a little guy at 650 cu in]
Far as I've read in the Ford Motorsports catalog   A441 were 4.9 BS for smaller cu in, B441 4.9 BS for larger cu in
C441 5.0 BS for large cu in
Altho not much of port from factory in any of the 3 castings and will need lots of portwork, seats and guides installed.
Will probly triple the $5500 bare casting price to get a new pair of bare ported heads.
And I think C and C wanted double that for a complete pair of heads.
As far as Thor vs Hemi heads, the difference is the Hemi heads make easy power[the combo doesn't have to be dead on]
For a thor head to make 1400+ hp the combo has got to be dead on[ie right cam, right port for cu in, right carbs or inj, etc]