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Old 12-04-2018, 03:27 PM
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Dyno results

I just finished my first build.
A sbc 350, bored .040 over.
Dart iron eagle heads, 9.8 compression.
221-221 duration at .50
.470 .470 lift. 108 lsa
I just back from the dyno, peak torque was 388ft pounds at 3800 rpm.
Peak horse power 333 at 5400 rpm.
I'm a very happy with this!

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Old 12-04-2018, 05:07 PM
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I got close with the 338 Hp guess in your previous thread about the engine.

Congtats, sounds like it'll run good for you.
If you ever decide you want more power, you just swap to a bigger head. The flow numbers for what you have right now are pretty much the same as a factory Vortec head.
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Old 12-06-2018, 07:50 AM
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in case anyone was wondering; heres the previous thread, mentioned previously
https://www.hotrodders.com/forum/hp-...ss-518521.html
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Old 12-06-2018, 10:21 PM
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Given the heads that's pretty close to where I'd peg it. Better heads would have picked up an easy 20 to 30 hp with no other changes.

Bogie
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Old 12-06-2018, 10:26 PM
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I just wonder how some of these head manufacturers keep selling product. Maybe these young builders do not know how to find CFM through the ports, because if they did, it is likely that this young man would not have chosen Dart Iron Eagles. Just curious.
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Old 12-07-2018, 09:42 AM
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Up here in the Northeast, there are a LOT of Dart IE builds. Tons of them were used in short track racing, they're cheap on the used market, throw a coated shim gasket on an undecked 350 and go. Plus they say "Dart". Instant 'racing heads' on my 350, just like Dave had on his racecar.

Also, there are STILL some old line builders here who still have a strong preference for 'steel' heads on street cars; and any American head is leaps and bounds over the chi-com 'junk'. :sarcasm:
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Old 12-07-2018, 04:58 PM
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Quote:
Originally Posted by techinspector1 View Post
I just wonder how some of these head manufacturers keep selling product. Maybe these young builders do not know how to find CFM through the ports, because if they did, it is likely that this young man would not have chosen Dart Iron Eagles. Just curious.
I think it is either failure to look up the flow numbers, or if they do they don't know where to look up numbers to compare them to, like the Stan Weiss Cylinder Head Flow Database.
Stan Weiss' - Cylinder Head Flow Data at 28 Inches of Water -- DFW / FLW Flow Files for use with Engine Simulation Software
Combine that with the "starry eyed look" you get from many when the name "Dart Heads" is mentioned, like AutoGear posted.
That's what I feel happens.

The IE 180cc is nothing special.....the 200cc and bigger can be pretty decent.
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Old 12-07-2018, 06:54 PM
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I'm very nappy with the results of my build. I wanted to build a motor with my 7 year old son for our 69 c10.
I wanted it to have a nice flat torque curve, as it did. I also wanted iron heads. My boy was with me every step of the way on the build, and my dad was with ,me at the dyno. What more could I ask for.
If I were to build a race motor so e day then I'm sure I would go roller cam and expensive aluminum heads.
But for my fair weather drivin c10, this motor is perfect.
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Old 12-10-2018, 08:11 AM
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Theres nothing wrong with a snappy iron-headed 350; and 3 generations of family involved??? Thats beyond cool! Congrats to you guys, NOW POST PICS OF THE TRUCK
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Old 12-10-2018, 08:32 AM
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My son and I took the motor out on Friday night and started the new one on Sunday.
We put a 2000 stall in while it was out.
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Old 12-10-2018, 09:33 AM
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Dude! Thats a killer truck!! Very clean and unpretentious; well done.
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Old 12-10-2018, 03:12 PM
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I usually consider that my favorite generation of GM trucks....unless a Tri-5 truck is parked anywhere nearby .

Cool that you get to do this with family, neat truck
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Old 12-13-2018, 08:12 AM
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Quote:
Originally Posted by AutoGear View Post
Up here in the Northeast, there are a LOT of Dart IE builds. Tons of them were used in short track racing, they're cheap on the used market, throw a coated shim gasket on an undecked 350 and go. Plus they say "Dart". Instant 'racing heads' on my 350, just like Dave had on his racecar.

Also, there are STILL some old line builders here who still have a strong preference for 'steel' heads on street cars; and any American head is leaps and bounds over the chi-com 'junk'. :sarcasm:

They are a spec head in some of the IMCA and WISSOTA stock car classes, especially if the class has a claim rule. I like Dart products myself over the unknown Chinesium crap that floods the eBay market.
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Old 12-13-2018, 08:35 AM
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Theres nothing wrong with an Iron Eagle head in good condition. Just have realistic expectations is all. I've always seen the IE heads as a 'porters head' when it comes to street performance. Its a good platform, and they can be a barnstormer if you can find a porter willing to huff iron chips for days at a reasonable price. However, for me, I'm just as happy to buy a quality chinese aluminum casting and have it assembled/valve jobbed by a competent head builder, using quality parts. Ive seen big money name-brand heads with issues right out of the box (seat concentricity and poor guide fits being the most notable). Given the cost to refurbish most used iron heads, unless its a spec head or a number-matching/era-correct resto? Go aluminum, just taking 40-pounds off the front end alone is worth it to me.

Regardless, I'd be over-the-moon if I got to build this with my Dad and my son! This is what makes hotrodding great.
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