Thank you for working on more iron stuff. I emailed you a couple years ago to have some iron work done and you declined me even though years prior you did iron stuff. I appreciate you taking the time to go over these heads & look forward to more iron stuff in the future.

I worked at a aluminum head foundry many years ago. They used a resin insert for the water jacket. Now they are using a loss foam method, which removes the need for a mold and the resin inserts. If you ever want to learn about loss foam methods, search KZfaq for Kelly Coffield. His methods are the easiest to follow.

They look to be cast by Dalton Foundry as there logo is between the central 2 rocker pedestals. Ive seen that logo on a lot iron heads, GM iron bowtie Vortecs, sportsman II's, mopar W2's and the list goes on. Seems like one foundry was pushing all the iron stuff out across the US.

When it comes to port analysis Eric you are the MAN

That head is in the 2016 Dart catalog 23* 170cc late model & vortec style

I purchased a set of these heads from Summit, because the stock heads cracked, and most of the online auto parts stores wanted more money for remanufactured stock heads than what Summit wanted. I was mostly after the fact that the Summit heads are better/thicker castings than the stock junkers! But it's a nice bonus that they come with stainless valves and screw in rocker studs too!

This is very interesting as I’m using some 906s on a lower budget 383 build. Thanks for the help Eric. Maybe this will help with the algorithm.

Another great video, Eric, thank you ,GODSPEED.

Looks like a really good foundation to port on. Thanks Eric. Hang in there.

Love your Channel Eric.....you do a great job!

Don't have a problem with Summit not making their stuff, usually that means they've tested and assured the quality is good enough to put their name on. I've hjad great luck with things like House name Water Pumps and Timing sets etc , same with Jegs actually some were better than certain 'name' brands, and cheaper!

Great video Eric! I have these heads and the Dart part number is on the opposite end of the Summit Logo end. I plan on modifying mine following David Vizard's porting tips for Vortec heads. They won't be great, but they won't be going on a race car either. Just going on a stout 355 street engine.

I've got a set of Dart 165 S/S heads on the bench I'm porting now. Exact same shift in the casting but the S/S has dual intake and valve cover bolt patterns and mine have the 2.02 & 1.60 valve sizes. I bought them bare though. I bought iron heads because they are going on a van which holds a lot more heat around the engine and I thought they would hold up a little better. Cheaper than finding a set of GM 300hp heads.

Thrilled with this video. I ordered a set of these back in January, when Summits stock was dipping into the single digits and it wasn't clear if Dart would be making more (they had just announced the discontinuation of the iron eagle line). Summits info in this head is outdated, and they advertise it as having umbrella seals and a 3 angle valve job. After having hands on 2 sets of cracked vortec 906 heads, I opted for these. My local machine shop went over them and found the valve guides had just under 1 thousandth clearance, and one head had some chatter on the intake seat. Not bad for the price. I would love to see what these flow with just a backcut on the intake! Cant wait till the rest of my engine parts come in and I can assemble my 383 vortec.

Well I got a lot out of that, thanks a bunch. I have been looking at these for a mild kind of small block. for what I see, and the cost, i like em.

I hope you do more product testing in the future. You cover all the points an average guy like me without a dyno or flow bench needs to make an informed purchase. I purchased your intake dyno testing book, #54. I didn't have any of the intakes you tested, but as a low budget DYI-er, I most likely be buying one of those for my home made engine project. My combination wont be the optimum, but I will know what I am working with either way. When my magic racing/engine money comes in, I'll go pro built stuff. This will help me bridge that gap. Keep it up, thanks. Any thoughts on Edelbrocks new carb?

That head is still available from summit. # SUM-151124. it's a fairly good head for applications where you need an iron head or a stock replacement vortec. I use them for SBC powered boats all the time. lake water is hell on aluminum heads. they are decent right out of the box, and even better if just some mild porting to remove the ridge you were talking about and gasket matching. I really don't like the hum on the top of the port, and I don't know how it effects flow since I don't have a flow bench. but i am sure it hurts the flow.

The circled DF casting mark confirms your thought that this is a Dart head. I don't remember seeing that on every Dart head, but the heads I remember seeing it on were all Dart.

Thanks. I'm watching. Maybe even learning something. Answered my questions.

I really like the blind rocker studs in these. Plus they are thick as heck

I got a set of these as a stock replacement year before last. Glad to hear it was an ok choice

For the $$ spent i absolutely loved this head and even cracked 400 at the crank with these heads/xr288hr/4 valve DISHED piston.. DART killed it with the casting on these and at $363 a piece at the time of purchase you couldnt go wrong!

I was looking at the regular ones but after looking at flow numbers again, I might as well get the Dart Iron eagle 180 intake port heads. Twice the cost. While these are about $800 a set, the 180’s are $800 each.

Talk about core shift on the that iron head! You can really see it on the exhaust ports! Guess I should of kept watching before I commented lol you say two seconds later

They had to machine the sbc valve cover holes to clear the gasket retaining lip in vortec vc. It's the very reason I switched to sbc covers and cork gaskets on my L31 w/AFR enforcers

Interesting !! Thanks Eric

Nice review. Have you gotten your hands on a set of the Promaxx 185cc Vortec heads?

So I had the 165 cc Summit heads and they are made by DART Also I found out the hard way that if they leave the bosses in for the 4-bolt Valvecovers the stock center bolt valve cover rails hit those bosses and you can’t build them on without modifying the heads or the valve covers so that’s why they machined them down

That looks pretty good I wonder how much that they're going for on the market

Very good video! I'm considering a Vortec conversion, from a 305 TPI/LB9, in my '89 IROC Z convertible. Too bad you did not use the "Scribe" , sitting on your table, to point to the "Step", in the exhaust port. Not clear which ridge/step your finger is pointing too. Further one in? Is the green tape covering an EGR (Exhaust Gas Recirculation) supply, on the exhaust side , of the Iron Summit head? Thanks, Michael, St. George, UTAH.

Eric, I am going to use the Dart 165 S/S with 87-95 bolt pattern. Charles S. is going to do the porting. I personally think they are good heads to start with if you dont mind doing some work and have to have an iron head deal. Thanks for the video

Interesting as always. Would you say its good value buying assembled heads or can one maybe get bare heads and springs, valves etc separately? Seems to me one dont have any control over what comes with the head. Depends vi n the make perhaps?

Thanks

That's pretty cool budget head

Confirmed. Dart has scrapped the tooling for cast iron heads. So whatever is on the shelf is what is available. World products messaged me back and said they had plans to discontinue cast iron heads at this time.

I have had a set of those 007 heads for about 3 yrs now, and was wondering about the flow numbers, they dont say dart or summit, but i took them off a vortec motor, casting 007 , any hp numbers ?

Eric, To get the Vortec valve covers to fit, the perimeter bolt boss has to be milled down. Something the Chinese heads including the AFR Enforcers do not have right. GM Fast Burn, real AFR heads and Edelbrock Etecs have them machined as a step but they are tapped for perimeter bolts.

I was wondering when I was going to hear Eric bring up the fact that iron heads are barely or aren't at all a cheaper alternative to chinese alloy heads. Been cylinder head shopping for a year and ive narrowed my choices down a lot. That is all thanks to Eric Weingartner.

So would a safe guess be the regular cast iron summit heads that we think are also made by dart, flow the same?

will a higher flowing head create more psi in the chamber?

NIce budget head

Did you see the holes for the rocker studs? Not centered

Eric when are you going to do a video on some SBC 13/15 deg manifolds and heads???

What are you guys doing about valve springs and guides with these heads if you plan to run a decent hydraulic roller? I want to run the Summit 8802 hydraulic roller cam with these heads but, lift on that cam is given as .525. So, at the very least the guides will need work. And the recommended Comp Cams 986 springs are 1.430 diameter. So, more cost than is immediately evident.

When will we see the b1 mopar heads?????

These flow about what the real vortecs flow. The Canadian 906s I have flowed 234 @ 0.450 and 242 @ 0.500. The Mexican 062s flowed 215 cfm @ 0.400 and fell to 210 cfm @ 0.450+.

They still sell these, in 165cc runner/72cc chamber (SUM-152123) and 175cc runner/67cc chamber (SUM-151124) form. Of course, I don't know why anyone would be interested in the one with the larger chamber and smaller runner, even for an OEM rebuild.

for a while summit sold a 165 "double hump" and a 170 vortec.

I just purchased these for my 98 5.7. Have a cracked exhaust port on my stock passenger side head but otherwise very clean engine with 171k miles. Wondering if I can re-use my stock push rods and rockers if they are in good shape with these heads?

Do these flow as good as the 906 GM heads?

Happy 4th of July 🎉..

Are these essentially the same heads that were used in The Danger Mouse Sbc motortrend build back in 2003?

The Summit Vortec heads # SUM-151124 flow 175cc as in all their books.

I thought dart discontinued their Iron Eagle 350 heads entirely. Did another foundry purchase the tooling for this casting? I doubt dart manufactured it themselves.

Actually it's a good looking head. It should be more capable than the vortec

I was just thinking. I'd like to see what the summit heads flow. I have a set that aren't called vortec. cylinder Head, Cast Iron, Assembled, 72cc Chamber, 165cc Intake Runner, 2.02/1.60 Chevy Summit Racing™ Cast Iron Cylinder Heads for Small Chevy SUM-152123

youtube black sheep fab shows summit sbc iron head w/o fi notch is 165 intake runner and flows 1.87.9 2.150.1 3. 199.1 4. 254.2. do you find these flow numbers are accurate and how do you feel about those heads for the street on a 355?

It floors me that they can get those kind of flows for the valve diameter, that's actually smaller than a double bump camel head! Summit shows them for $369, not a great deal of money considering you get the valves in the springs etc.

They only make two cast iron heads The dart 165 and this vortec.

I was looking at getting these, after 5 mins of research a nearly barfed. Not even close to a good vortec head

The Etec 170s eat these for lunch.

Aluminium is light ,and if you have an iron block they don't get along to well they heat up and cool down at different rates of temputure I don't want to replace the head gaskets every 7 or 9 years the Toyota 22 R was a great engine iron block aluminum head I'm 60 now and I don't want to replace head gaskets every 6 to 8 years that's just me ,make it all alumnium or all iron

For on the street the Iron heads are a giant waste of money! If i had known what I know now about vortec heads I would of spent my money on a set of Ebay DNA heads and spent the money at machine shop doing valve job! Everything vortecs cost more money and the weight of cast iron sucks!

Well you do not have to worry about cast iron heads. Dart is discontinued cast iron heads for the small block Chevy January 1, 2023. Great. How is that made in china crap helping made in USA. I don’t want aluminum heads not for street, not for anything.

Look at CHI Australian heads. Brilliant. Also Racer Pro. ..makes brodix look like puppies.