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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 09-15-2007, 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 09-16-2007, 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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Old 09-17-2007, 11:19 PM
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Aftermarket vortec heads from summit iron heads the castings have a larger alloy mix than standard gm castings or new bowtie heads for that matter and are less prone to the famed cracking of vortec heads. Edelbrock E-tec heads are some of the best vortec style heads and I believe the only ones that are alumnium for that fact. Summit and Edelbrock also have machining for higher valve lift .520 and .575 respectively.
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Old 09-18-2007, 02:31 PM
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What makes you think the factory Vortecs will crack? You are going to have a cooling system, right? Does anybody really think that General Motors likes to do warranty work on their bread and butter vehicles (pickup trucks and SUV's) and put heads that are prone to cracking on millions of engines? I just read an article in one of the performance rags that was bragging about the "meaty" 3/8 deck thickness of some patriot head!
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