That's a D4.

D4's are NASCAR heads. Never were used for much else because they are cast iron and drag race people want the light weight of aluminum. Tom Hoover said those were the dyno champs. That casting date makes you fantasize that your are in Petty's Superbird at Daytona.

Would you have a set for sale?

currently I've a old KB block going to the machine shop that need to get repaired and I was going to modify it as well to work with the D5 heads, but I'm wondering if I should forget it and take a less exotic path.

I've had several sets. I recently sold the last set that I had. They were NOS. If you decide to go that way I still have some plug tubes, intake gaskets and maybe some other small items.

I would suggest a less exotic path.

I went through a few sets of antique non street hemi heads until I smartened up and just ordered new Stage V's years ago. I found that repairing and reworking old Hemi heads was more expensive than just using new heads. JMHO.

thanks. I'll make my mind in the next days and if I follow my crazy idea and I might contact you to check what you'd have.



the thing is that I'd like to build a pro stock car the way they were back than, or as close as I can. I've a 70's KB alu block, a pair of D5 heads and a set of old dominators.

and when that is done that might go in the 1969 dart that I've.

I'm not in a hurry to finish, I'm just starting it, and because the block is going to the machine shop for repair, I've to decide if I modify it for the D5 or go for another set of heads.

I've contacted the guys at rockerarms.com and they said that they might be able to build a set of rocker arms for me.

but yeah, might end up using some different heads, at least for now.

It's not just rocker arms. You need the whole rocker assembly. D-5 rockers can be found. You just have to look hard. There are a lot of other parts too. It would be a lot of work if you were in the US. Worse where you are.

You convinced me, I'll put this idea aside, and probably go with a Stage V. I'll still keep hunting and collecting parts, maybe one day I'll be able to build it.

I am not sure of the age of your KB block and how the steam holes are placed. If they are they same as KB does it now you can tell Stage V that and they will drill the heads to that steam hole pattern and KB has Cometic head gaskets for that.

the block is from the mid 70's I believe, I'm not sure what are the differences to a more recent KB.

I was googling about the Stage V heads, and I've found that the have different models, like: replacement, and millennium.

I was checking where I could get those as well, I'm looking for a place where the can do some work on it as well.

do you guys have any preference, for any of those locations?
- Ray Barton
- Arruzza HP
- Modern Cylinder Head

I might get my rotating assembly from Ray Barton, mostly because if their camshaft and lifters.

Arruzza has closed. Millennium heads are too complicated for your application. Barton can make enough power without them. Lay a stock head gasket on your deck and see how the steam holes line up. If I were you I would buy all the stuff from Ray Barton.

By the way there is as good chance that a D-5 wouldn't even fit in the 69 Dart you are talking about. A D-5 is very wide.

Wonderful info from knowledgeable hemi Guys!

The D5 was a disaster for Harry Weslake indeed.
He had the idea that the hemi needed a smaller ‘round port’ intake design.
History has proved this to be ‘very wrong’...

But I am very interested in the Weslake story and would hope to one day...
Piece together a complete D5 for my Weslake ‘Mopar’ collection.

I have some iron hemi parts from his old ‘Rye’ Workshop.
But all the D5 hemi parts were scattered ‘far and wide’?

Best wishes from Limey John Kent UK