Inliners International Forums General Discussion Engines Head Design

Has anyon every designed a 12 port head for chevy 250 series engines and submitted the idea to a large company like edelbrock? i would figure that if a good flowing head that gave 50-60 horses over stock could be had for the same price as a pair of v8 heads that more people would be willing to keep their 6's???has anyone ever throught/tried to do this?

I would guess that any one able to do that is probably working for NASA or the one of the "big three" auto makers.

Sounds like a good project for an engineering grad student.

The best one out of Detroit was the Pontiac OHC 6 in the late 60's which was 12 port as I recall.

Good idea though, John M....

The Duggan-Sissell head has been around for years, call Sissell's Automotive (see ad on back page of The 12 Port News). Ph. 626 331-2727 or go to www.sissellsautomotive email sissells@aol.com

Also check out The Chevrolet INline SIX-Cyliner Power manual by Leo Slantucci for more ideas on 250 heads.

i took a look at the sight and i must say that cylinder head looks impressive. are there flow-ratings for that head? would it be worth the 3000 dollars to get one or just get one of there dual lump port head for about 2200 for a turboed street car???

If your talking about the New alum Head that he has It will need his intake and a few other goodies. So for the buck it would be more cost effective for you to do a bolt in lump port. MIke Kirbys work and Heads speak for themselfs AS HE has Many Drag Rec. holding cars That speak for His work. Hope this helps }[oooooo]

For $3000 you are just getting started. You will need, additionally, their intake & exhaust (or custom make your own to fit), studs, springs & locks, and quite a few more accesories to make the engine ready to run.

Of course you wouldn't want to invest this much without doing proper justice to your bottom end as well.

You can count on spending 4 grand plus easily in the finished head assembly before you're done if you go with the Kirby head. This isn't the type of money enthusiasts spend on their street rods. You can build a couple of 300+ HP small blocks complete for that kind of money.

I would love to do a cast 12-port head for about 1/3 the cost of the Sissell head, for street use. I believe such a head would sell really well, if a profit could be made at that price.

-magic mike-

My Brother and I talk to Mike every couple days because He is doing a race head for us. The price of the head is not really that bad compared to the power that can be produce with it. A pair of small block heads that will build 2hp per cubic inch are $3500-4000 a set.

The picture of the 250ci is a street rod motor with programable fuel injection built for a guy thats tired of cookie cutter small blocks.

This head isnt no get "RICH" scheme for sure. I know if he could build them cheaper he would. This is a one man shop not a large corp. running multi tasking machines 24-7.

Steven

You have to omit That is one awsome Head. And for the Power that can be made from it can't be beat. I know one of them Heads have always been on my Wish list. Even the very first one I saw On a 230 block at 460HP with 3 660 holleys On a custom intake. }[oooooo]

for a street motor im not sure if would want to spend that kind of cash on a head...but as far as casting your own twelve port head, i dont think the design process would be that difficult, it would actually be the forming of the pre-mold. if could figure out how to make a mold of the intake/exhaust passages and the water jackets the rest would be easy.

Yep, that's pretty much my point here. Enthusiasts can't justify (or, better yet, afford) spending that kind of money on just a head. Just to have how much usable street power? As much as a mild small block? It really is logically insensible.

I'm speaking from my own perspective here, and certainly to each his own. I really like to drive my vehicles so reliability, street and cruise-ability are important to me. I also like to be different (which is why my 66 stepside has a 292). But at some point, economics and common sense kicks in and I start thinking about $$$ per HP, parts availability and overall out-of-pocket expenses.

Damaging a head on a 300 HP street 350 can be replaced for a few hundred bucks by a local race shop. Damaging the Sissell head costs me two children! (you get the point)

So the Sissell head is very much for drag racers and enthusiasts who really, really into the "being different" thing. But never for me.

-magic mike-

has anyone has expeience actually casting engine parts? im interested in how the water jackets are designed into the head...i have an idea, i just cant seem to visualize how to make them.

There is a good little book explaining the fundamentals of pattern-making and molding called The Charcoal Foundry by David J. Gingery. The ISBN number is 0-9604330-8-2. It has good illustrations,and is geared for the home workshop as well.

I had talked to Arao, now Dominion, about a four valve head for a Mercruiser 4 cyl. He was making them from billet! I don't want to even think about how much you would have to twist it around trying to mill water passages. It was $3000 per head 10 years ago, so this method is possible, but again not practical unless you are a retired machinist.

Robert Lee, http://www.40bob.com/index.html is planning to manufacture an aluminum dual overhead cam cylinder head for the popular but discontinued inline four cylinder Ford "Lima" engine. The single overhead cam Lima dates back to the 1970s and was used in many Ford-Mercury automobiles and trucks as a 2.3 and 2.5 displacement.

Perhaps an email or telephone call to Robert Lee might be beneficial?

Regards,
Gerry Dedonis
Kansas Racing Products Inc.
http://www.kansasracingproducts.com

Mike did a artical for Hot Rod Magazine on the aluminum heads. It should be on the news stand in March 05. The write up has the street motor as well as a race motor build up. I'm pretty sure he dynoed these motors also.

Steven

There was the Waggot Dual Cam head for Holden 6's. If they share blocks with Chevy, we just need some Aussie members to tell us how rare they were or if they are still out there.

Im a ford guy so im not sure about this, but clifford offers a blue printed performance head and a competition head for the 292 series chevy I6's im not sure if its 12 port or 9 port but it takes away the boss thats in the middle of one of the ports, once again im not a chevy guy so check it out if you want, Http://www.CliffordPerformance.com

I think an organization like Inliners International could ask enthusiasts how many of you would buy an new head for your 194-230-250-292, if one were available? I'm sure if the numbers were high enough, Brodix, Dart, Edelbrock etc. might consider manufacturing a replacement head.
I personally would like to see an affordable cast iron 12-port head for everyday driving that uses stock chevy components, rocker arms, valves etc. (exc. intake/exhuast manifolds). If you use components that are already being produced that should keep down costs.I'm not sure whether or not aluminum heads would cost more to produce than cast iron heads.
I'm sure someone out there has the resources to get some engineers and start the design work and then the casting, machining, and assembly can be farmed out.
Just my 2 cents.
Dano

If I had the resources or at least knew where to start I'd do it! Actually, I would design a whole new 300 ci inline six that uses stock chevy v-8 engine parts to keep the price reasonable, but there might be a licensing problem there. One day soon big I-6 blocks, heads, and components are going to be extinct. Time to start planning.

hello..wow!! awesome comments..let me ask this....why dont you try modifying Chevy Inline 6 head and using the PES Bolt-In Plates? Have you? Have you seen what it does? its amamzinggggggg....Its nice to have great ideas!!!!so try the idea of modifying with whats available!!!!
I guess until you do it you just wont know-how can you think of a high $$$ 12 port head when you cant find 1000- 1500 for a VERY good high flowing head?.... I am not trying to be a smart ass or cause a problem, but whats up with all this talk of head modifying? have you modified the head you already have?

Try it and for a daily driver you will be VERY Amazed.... (speaking of cfm,s)now, 300 plus and 200 plus on a race is a good start so why not a 260 and 175 street head?

Lee

Hi all, I was wondering if Mike from Sissell automotive did make in the March 05 Hot Rod magazine?

Hi all, I was wondering if Mike from Sissell automotive did make in the March 05 Hot Rod magazine?

Lee,
I have not as of yet modified the head and do plan on doing a lump port...this post was more of a hypothetical. Also, I think more people would take advantage of PES bolt in's if they had a website that they could be purchased thorugh instead of having to call them.