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Old 09-10-2007, 08:07 PM
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Dart iron eagle vs. World Sportman II

Which head is better for a street/strip hi performance 355 w/ hyperutectic pistons and GM crank/rods w/ ARP bolts? Looking for which has the better maximum horsepower. CR will be around 9.75:1.

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Old 09-10-2007, 08:26 PM
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Dart etc

Check out the flow numbers 383Silverado linked to in another post. The name of the post is something like "SBC after market head flow numbers"
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Old 09-10-2007, 10:22 PM
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For outright performance the Eagles will win. Even in stock form the Eagles will do you better. Maximum HP means porting will be needed.
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Old 09-11-2007, 10:28 AM
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heads

Yea,, exactly what Rick said....

Keith
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Old 09-11-2007, 10:59 AM
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Ditto


The Eagles are a newer design, the SII's have been around quite awhile, kind of like the GM Bowtie heads
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Old 09-11-2007, 02:40 PM
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Quote:
Originally Posted by ernkazern
Check out the flow numbers 383Silverado linked to in another post. The name of the post is something like "SBC after market head flow numbers"

here's that link awoodman


aftermarket sbc head flow numbers
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Old 09-11-2007, 02:50 PM
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awoodman,
I have two sets of world heads for a ford W, I will never buy another set.

take care,
rich
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Old 09-11-2007, 07:00 PM
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The Dart 180cc iron eagles only flow 208cfm out of the box. Advertized is 221.
Althou porting will help this head is still down about 10 to 15cfm from other comparable 180+/-cc port heads.
I have not flowed the 200cc or larger Iron eagle "Platinum series" heads myself.

The World products 200cc Sportsman II's flow 240cfm out of the box.
if the valve job is crappy it will be more like 224cfm out of the box.
They make good power out of the box and great power with porting. It's easy to get 260+cfm from these heads with some porting.
They are both good quality heavy duty castings.

The RHS Iron lightning is a better head in my opinion.
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Old 09-15-2007, 08:38 AM
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Okay, if I get the Dart iron eagle head for my sbc 355 street/strip motor, which intake port volume would be the best to get? 180 or 200?
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Old 09-15-2007, 11:11 AM
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And straight or angled plug? whats the difference?
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Old 09-15-2007, 12:03 PM
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Quote:
Originally Posted by awoodman
Okay, if I get the Dart iron eagle head for my sbc 355 street/strip motor, which intake port volume would be the best to get? 180 or 200?

Avoid the 180cc Dart Iron eagles. The out of the box intake port flow is only 208cfm. They don't flow any better than the smaller 165cc Iron eagle SS head. These heads are not the same as the new revised "Platinum series" dart heads (200+cc intake ports)
If you want a 180cc sized port use another brand.
The 200cc and larger iron eagles are fine.
You want to match the intake port volume to the engines cid and rpm range. and cam duration for best results.

You'll see the 180cc Iron eagles advertized at a discount price but in my first hand opinion they are not the best buy at all. (even when ported).
The Sportsman heads have been and continue to be a very good overall head for the price. Especially with a little porting.

You can make a serious street/ strip 350 or 383 using the Dart 215cc Iron eagles, a vic JR/750 and a 250@.050 degree ish +/- mechanical camshaft.
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Old 09-16-2007, 07:19 AM
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So do you reccomend a 200cc head with straight or angled plugs?
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Old 09-17-2007, 07:16 PM
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wait...for a mostly street and some strip, should I get 200 or 215cc intake ports? Wouldn't 215 be a bit too much? According to what other people have said, id lose velocity with ports that big.
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Old 09-17-2007, 07:59 PM
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And we seem to be forgetting Vortecs which flow more than any of the above with 170cc ports.

The aftermarket street heads are mainly designed for race classes where street heads are required. They have tons of meat for strength and porting room. In stock form, none of them shine.
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Old 09-17-2007, 08:37 PM
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Yeah those do seem to make the most sense but im worried about the cracking problem...
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