[428RA4]

Just got an estimate on a quad intake.

4500 to 6500 complete finish like it was a factory piece. My ass hurts.

[higgenslake]

Take the pain out of your ass and make it yourself.

[428RA4]

I think that comment is easier said then done. Once you put a bead on the intake it warps like crazy. It's a constant battle to keep the flanges straight as you massage the part into position. I have done sheet metal welding but never aluminum. I don't think I want to learn on this project.

Thanks to others that verified the deck height on the V block.

[Ron H]

Hogans, Gaby, Marcella, many options and built as you need it to be, not as it was with more opportunities to deal with.

[Ron H]

Originally Posted by ho428

The 433 that I'd put these on already have 18cc dished to get 9.8 with the 72cc 48's
I'd have to go with 65cc chambers or get new flat top pistons and around 75cc to get me around 10.5 with the new heads.
Personally I'd prefer the FT piston and 75, but there's another $500+ piston adder to the bill, for street use the dish would probably be ok.

Now the question is, will the 72 chamber already be in it and can I mill it down to 65, or have chamber profiles for smaller to larger, and made to order?

* CNC machined 72cc and 85cc heart shaped combustion chambers for on the shelf
heads
* Heads will be cast without combustion chambers so custom combustion chambers
can be ordered to customers spec's

^^^ from the first post Don made.

[428RA4]

Originally Posted by Ron H

Hogans, Gaby, Marcella, many options and built as you need it to be, not as it was with more opportunities to deal with.

Yep - that be one artist that matches the quote.

[charlie66]

Would you ever consider making a bullet version of your heads for guys that are boosting there motors real high??

Thanks

Originally Posted by dci

Just curios why everyone is stuck on the larger chambers. You will need to get pistons made for a turbo or blower application any way, and smaller chambers make more power as well as unshroud the valves quicker improving flow. So I always tell my customers when building an engine from scratch to keep the chamber as small as possible. Doing so helps in so many area's like quench, timing, flow, spark plug position, just to name a few off the top of my head. I could understand if you have an engine already built and want to lower the compression, but starting from scratch it does not make sense to me. What are everyone's thoughts?


Don Johnston
DCI MOTORSPORTS INC.
330-850-5050 shop
330-628-3354 cell
Designer of the DCI Tiger Heads and the NEW DCI Ram Air V Heads !!!!!

[Jack Gifford]

Originally Posted by 428RA4

... Once you put a bead on the intake it warps like crazy. It's a constant battle to keep the flanges straight as you massage the part into position...

I guess my homemade hemi blower manifold could be called "sheet metal"; 3/8" aluminum sides/front/rear with 1/2" top and 1/4" bottom. Total cost was very low- I machined and formed the pieces and paid a local shop (not a race shop) to TIG it together. I provided him with a bare long block to use as a "jig". I only had to do minor milling of the flange and top surfaces after it was completed. I probably paid more to have it professionally polished than it cost to fabricate!

[Bill Bolin]

I have a 535 that will have a 8-71 on top of it. You asked why I or anybody would want a large chamber. If I use 85cc as the chamber volume, zero deck height and .041 gasket thickness, I would need a 50cc dish to get to 8.5:1 or keep the piston down in the hole. I don't like broken ring lands and would prefer a flat top piston or much smaller dish to achieve the desired compression. Maybe 85cc will be fine for a 400-462 but with a bigger cubic inch motor, it would be nice to have a larger chamber. On my old 474 I ran 6H heads (124cc) and I am currently building the 535 using 7F6 heads (111cc) and will run a thicker head gasket to get down to 9.5 with flat tops ( I bought the shortblock for a deal and it already had the flat tops in it). I know I am in the minority but I think there will be more 505-535 boosted Pontiacs running around soon and a larger chamber would be nice to have. I understand you have to make a business decision and appeal to the masses. Just my two cents

[dci]

I would definitely consider making billet heads, but the cost for most would probably keep production low. I will cast my heads without water jackets for anyone wanting to run them in a boosted application. I'm not sure if there will be any advantage in running a billet head over a casting without water. I know Sonny Leonard uses the same foundry I do, and he has heads for blown applications that are castings not billet for that application. I do know that having the separate exhaust port layout definitely helps on a blown engine as well as nitrous.

Thanks for the input Bill. I can understand why someone might need a bigger chamber in some situations, but for the normally aspirated I think the smaller the chamber the better. We are casting the heads without a chamber and cnc'ing the chambers in. My head definitely has the room to put a bigger chamber in and I can do that. I don't think that the bigger chambers will be what the majority would like. So that is why I did not right a program for them, but it can be done no problem. I am going to offer a custom combustion chamber option for anyone wanting something other than what I will consider off the shelf heads like Ron H pointed out.


Don Johnston
DCI MOTORSPORTS INC.
330-850-5050 shop
330-628-3354 cell
Designer of the DCI Tiger Heads and the NEW DCI Ram Air V Heads !!!!!

[jdw_poncho]

Originally Posted by dci

I would definitely consider making billet heads, but the cost for most would probably keep production low. I will cast my heads without water jackets for anyone wanting to run them in a boosted application. I'm not sure if there will be any advantage in running a billet head over a casting without water. I know Sonny Leonard uses the same foundry I do, and he has heads for blown applications that are castings not billet for that application. I do know that having the separate exhaust port layout definitely helps on a blown engine as well as nitrous.

Thanks for the input Bill. I can understand why someone might need a bigger chamber in some situations, but for the normally aspirated I think the smaller the chamber the better. We are casting the heads without a chamber and cnc'ing the chambers in. My head definitely has the room to put a bigger chamber in and I can do that. I don't think that the bigger chambers will be what the majority would like. So that is why I did not right a program for them, but it can be done no problem. I am going to offer a custom combustion chamber option for anyone wanting something other than what I will consider off the shelf heads like Ron H pointed out.


Don Johnston
DCI MOTORSPORTS INC.
330-850-5050 shop
330-628-3354 cell
Designer of the DCI Tiger Heads and the NEW DCI Ram Air V Heads !!!!!

Have you decided on a price point for the solid head? Sorry if I missed it but what length valves does it has?

Have you worked out a shaft system already?

Assuming since its a solid head you can add additional head bolt holes?

I would be interested in a solid head at 90cc-100cc's. But I wont be ready to buy until mid late summer. I want to test my new heads first before I buy another set.

I wouldn’t need any porting option but I would like a cut back exhaust.

Jeff

[Tom Vaught]

Jeff are you the same guy that blew up his chit at Steve Morris Dyno a year or so ago?

Tom Vaught

[428RA4]

Originally Posted by Jack Gifford

I guess my homemade hemi blower manifold could be called "sheet metal"; 3/8" aluminum sides/front/rear with 1/2" top and 1/4" bottom. Total cost was very low- I machined and formed the pieces and paid a local shop (not a race shop) to TIG it together. I provided him with a bare long block to use as a "jig". I only had to do minor milling of the flange and top surfaces after it was completed. I probably paid more to have it professionally polished than it cost to fabricate!

Hey Jack -

Yeah, a sheet metal intake is far easier to build then modifying a cast aluminum intake is what I understand, and it makes sense. I on the other hand am going for the vintage retro look and having a bunch of sharp angled pieces with raw welding beads at all the joints is not what I'm looking for.

So with that said, I gave the authorization today to move forward with the low rise dual quad intake. I will request pictures throughout the entire project and post them in the forum so everyone can see the progress in another thread out of respect for Don's project. It's already an all over the place topic, but a very interesting and informative mess we have here~!

[brians]

Keep us informed. I would be interested in seeing the progress on an intake.


May not be the best for under the hood clearance, but you can not beat the look of the factory tunnel ram vs. the factory low rise. (just incase Don is looking for votes for casting a factory 2x4 intake)

[428RA4]

Thanks Brians -

Odd thing with that single plane intake shot you have there. It looks like they welded that intake on backwards.

I may be wrong, but something does not look right.

hmmm....

[tom s]

If I remember right,the factory single plane and dual plane intakes are same height to top of carbs.I owned one of the dual planes for a short time.Tom

[brians]

Can not state Tom, never measured them.
Though, I do not remember the carb bases sitting much higher then the intake flange on the duel plane.

428RA4 – That is a factory tunnel ram in the picture. Just been coated and painted black too many times.

[428RA4]

Originally Posted by brians

Can not state Tom, never measured them.
Though, I do not remember the carb bases sitting much higher then the intake flange on the duel plane.

428RA4 – That is a factory tunnel ram in the picture. Just been coated and painted black too many times.

Yeah, I think I finally realized that after my posting, but damn, is so looks like a Ford Tunnel Port intake. It even has the plugs in the balance tube between the carb bases. Talk about an engineering rip off.

[tom s]

Nunzi has both,will ask next time I talk to him.Tom

[428RA4]

Originally Posted by tom s

Nunzi has both,will ask next time I talk to him.Tom

While you are at it. Tell him we want to borrow both too.