Inliners International Forums General Discussion Hi Performance New Heads and Stuff

New 12 Port 6 cylinder and 8 Port 4 cylinder heads & what goes with them.

I don't know all the details but here is a picture of some of the new stuff coming your way soon from Scott Marshall. This is just a part.

Now you did it , he'll be so busy answering questions he won't have time to machine the parts.

He can just send out the raw castings with instructions.

I was thinking that could be an option for the DIY guys. And maybe a bare machined head and let the buyer get their own parts to complete the assembly.

wow

very, very, cool!!

Scott (CNC-Dude) will be offering his new acquisitions after the first of the year. Like I said I don't know all the details but here's what I think I know.
Scott has purchased some parts and the patterns to cast them from Joe Deppe. There is a 12 port L6 head and an 8 port L4 head. There are valve covers for each. There are patterns for L6 & L4 blocks and a couple of 4 cylinder blocks. There are two timing covers a one piece and a two piece set up for external drives. There are intakes for mechanical injection and 4bbl carb. This should make our lives more interesting. I'm sure Scott will answer questions and maybe he has some better pictures.

Adding to the info:

1) The 4-cylinder block is designed for midget racing with a provision for an in-and-out box, not a traditional Chevy bell housing. Furthermore, there is no provision for an internal oil pump so an external pump (dry or wet sump) is required. In addition, I believe there is no provision for a distributor and a crank trigger is required.

Scott has a couple (?) of raw cast 4-cylinder blocks in hand. I'm not clear whether he has patterns for a 6-cylinder block or not. I know the (longer term) plan is to provide both 4- and 6-cylinder blocks with water jackets and provisions for a standard bell housing and starter. Don't know how/if Scott will deal with the distributor issue. (By the way, Joe Hunt can make up one of there "magneto look" HEI distributors for most inline 4s and 6s. They're not cheap but they work well and sure look nice!).

2) The 4- and 6-cylinder heads will be offered as either solid (race only) or water jacketed. In another thread, Scott indicated that he might offer an option of providing a bare, but fully machined head to allow the buyer to finish out the head with their own choice of components as dictated by the intended use.

Obviously, the new heads are not cross-flow but similar to the Sissell/Kirby head with the exception that Scott's heads have rectangular intake ports while the Sissell/Kirby head have round intake ports.

3) The photos show both 4- and 6-cylinder port injectors and, as already noted, one of the two front covers provides mounting for a typical Hilborn or Enderle mechanical fuel pump. I believe there is also the provision to drive a water pump off one of the front covers (though perhaps not both the water and fuel pump - not clear on that).

In exchanging email with Scott, I suggested that he might consider modifying these patterns to include EFI injector bosses for customers that want to go that direction. Of course, these new heads will bolt up to the OEM 250/292 blocks.

4) One of Scott's tasks (I'm assuming early on) will be to revise the tooling to replace the Deppe and Duggan branding with his own Marshall brand.

5) Finally, though not a part of this group of products, Scott and I have been working on a new intake system for the good old siamese port head. The plan is to develop an intake similar to the early Corvette "Blue Flame" setup that will use three side-draft Carter YH carbs. Should be "old school cool". We'll keep you posted on the progress of this project.

The above is somewhat preliminary and, if I've got anything wrong, I'm sure Scott or others will make the necessary corrections.

Russ

Thanks Russ, That's more than I knew. I'm really interested in the 4 cylinder stuff especially the head. Sounds like EDIS ignition would be an easy way to go. The 4 bbl carb manifold would make TBI a simple installation too. All of a sudden there is a lot of speed equipment to choose from and this time around it our friends who are making it. How cool is that?

Beater:

The 4-cylinder head should bolt right up to the Chevy-II iron block. I'm guessing Scott would need to build a new set of patterns for the 4-cylinder 4bbl intake similar to the 6-cylinder manifold shown in the photos.

Just thinking out loud: Perhaps the 6-cylinder 4bbl manifold patterns could be revised to support a 3x2 setup as an option. Hmmmm ...

I also talked with Scott some time ago about the idea of side covers with mounting pads and nice finned covers to mount (and hide) coils for "coil near plug" ignition to replace the typical distributor.

Russ

I have a nice pair of 40 DCOEs that would be great on a 153-181. Building an aluminum manifold for them would be easy.

For coil near plug (or EDIS)ignition, a 36 tooth timing wheel needs to be mounted on the front of the crank.

I can supply the control box to make it work - with a base timing curve in it so as long as the sensor and wheel are mechanically degreed in it will start and run without any messing around.

Beater, there are so many possibilites with induction choices for the 4 cylinder. A Weber manifold will be easy to make for that head. That EDIS sounds like a good option as well. Maybe the mechanical injection manifold can be modded for use as an EFI. A 4 BBL intake is going to be easy to make also if there is any demand for it.

The whole new "Marshall Collection" is filled with possibilities. The 8 port head interest me for other reasons besides my 153 blocks. Remember the Stude V8 head on the Model A I was considering? This in a pre or partially machined form might be better for the "A" or my '28 Chevy L4.

I will quite saving cans for my stuff and send them to Scott. He is definately going to need them.

It looks like between me and Tom, Coke and Pepsi will be calling us to see if they can buy some aluminum to make their cans with.

Beater, here are some pics of my new 8 Port head and the FI intake manifold. I threw in some of my new 12 Port head, both solid and water jacketed version.

Is there more to come? T.Lowe talked about a crossflow head. Is this also coming from you Scott? Or was there just confusion over 12 port and crossflow?

No, the Crossflow head is an entirely different project that both Tom and I have been involved with the development of for a year or two now. He and I will be the distributors of that head when it comes available. This 8 Port and 12 Port head and accessories are mine solely and not the same head as the Crossflow head that has been discussed in another thread. Sorry for any confusion.

Thanx,
Now,should I wait for the crossflow head or get on the waiting list for the jacketed version coming up first.

Decisions, decisions, decisions!

I love it!

A lot of cool top end combos coming for the 6.

i keep checking this thread for more photos, mega excited to see all of this! any ideas of pricing roughly? i take it these will be in huge demand so will no doubt be a long list of others wanting stuff. drop me a pm if needs be.


cheers joe

Now we're gettin' somewhere! Man those big pictures take a long time for my laptop to load but they look good. Scott, I'll give you some time to sort things out but I am working on an entirely new engine build for a future project and I will be asking about different stages of completion on the 8 port and timing covers. Maybe injection setup as well. Beater

Thanks Beater, just let me know how I can help your project get to the next level. To answer some of the other questions, I am currently making fixturing and gathering tooling to be able to machine the raw castings once I have them cast. Pricing is going to be competitive with other companies in the market, if not a little better. I also will have a larger selection of products available than other companies have for the inlines, such as the 8 Port head for the 4 cylinder engines and a few other components. My products will also accomodate all levels of enthusiasts, from the DIY-er who wants just a raw cast cylinder head to tinker with on his own, to the all out racer.

Another advantage to my products is that I am not going to take half of your money as a deposit and make you wait for over a year to get your parts. My parts are going to be on the shelf waiting to be shipped when you call, and then they will be shipped out to you at once. I know this has concerned many people over the years with having to do this with other companies, but I am not going to require this to be done with my parts.

Feel free to ask any questions you have about these parts. Im currently in the unpacking stage now, and can add more pics if anyone needs or wants them.

photos of a 12 port head with teh throttle bodies and rocker cover on? could quite easily sit here and look at these photos all day!

I was on the fence about keeping the L6 in a truck that's going to be my daily driver but after seeing the all those goodies I'm definitely keeping the L6 , you got my wheels spinning hard on some type of mpi / efi.

I will be inline to buy some type of top end.

The possibilities are endless with the combos that are now available and still yet to come. Hold on to your inline for sure, the look of shock on the V8 guys face when you spank his ride is priceless!

What kind of rockers do these heads use? What do their chambers look like?

Beater:

I'll be interested to hear what Scott has to say on the rocker issue as well. But if I had to guess, I'm thinking stud mounted SBC or BBC roller rockers.

Russ

These heads use the standard stud mount BBC 1.7 or 1.8 ratio roller rockers or the Inline 6 1.75 ratio stud mount roller rockers that Crower or Tlowe sells. Clearancing may be necessary on the big body style aluminum roller rockers, just as they are on most any inline application.

Wow! Occasionally blind squirrels find acorns ...

Russ

Here are some more FYI facts about these castings that im sure might be asked sooner or later, its regarding weights of the various items:

Water Jacket 8 Port head: 23 lbs.

Water Jacket 12 Port head: 37 lbs.

Solid 12 Port head: 48 lbs.

8 Port Aluminum 4 Cylinder Race block: 63 lbs.

Here is a pic of the 8 Port Race block. It doesn't get any more basic than this.


Here's a pic requested by pinstriper in the UK.


And for Beater, the next 2 are for you showing the chambers, both raw cast and semi-finished:

I like all.

I like it all.

I see more 4 Bangers in my future. But first the one with the lump port head that Tlowe built. Then a turboed 181 with the water jacketed 8 port head and an experimental with a vintage block and one of the solid 8 ports. And there is still the STUDE-A-BAKER. Man I've got to get that shop cleaned up!

thanks for the photos Scott, love this thread full of inspiration, keeping an eye on this!

Just for reference, the 160 CID Midget engines made 375 HP with this 8 Port head. A turbo 181 should be very interesting.

I use to think engines were just something to play with and get around anywhere, now I look at this type of equipment as works of art in some way. Strange,I know. must be my age.

My .040 over 153 with the 181 crank, Ross flattops, custom Erson cam, 2X1 intake, and Tom's head will be of interest.