I read your other post and I'm wondering what you are referring to with "aluminum vortec" ... the Blueprint chamber doesn't look like the Vortec casting to me.
lots of shadows, here is a better shot of a "Vortec" truck casting:
chambers are pretty significantly different.
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Engine Masters Tests CNC-Ported Heads Against Vortec Heads On A 383 Chevy To See If The Performance Gain Is Worth The Cost!
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Originally posted by SuperBuickGuy View PostThe Vortec, iron head had more power and torque until 3100 rpm. That is the place most street engines live - thus, if you had those aluminum heads on your Corvette (and I had similar ones), you'd lose power and economy in your day-to-day life for marginal gain on a track
not sure how you're missing the point
The iron vortec head is better at low rpms and the AFR heads are better at high rpms. Quite simply the flow on a vortec head would become a choke point at rpms about 4500.... I have have some pretty cool flow-modeling done by my wife that demonstrates this....
I disagree. On the track, the aluminum heads in this test are going to have an advantage. Less weight, more power. I asked if you typo'd that for a reason because that statement is awkward.
In the type of car I would put aluminum heads on, I'm not going to be spending all that much time below 3100. That's what gears are for - keep it in it's happy place. If I was worried about economy, I wouldn't be putting a 210cc head on a 383. Hell, I'm questioning a 210cc head with less than 11:1 and a single plane in a light car with 4.56's and a 5 or 6 speed and frankly, I wouldn't consider a 2.08 valve for anything smaller than a 4.125 bore 400. I sure as hell wouldn't build a 383 with that much port for a 31" tire on a truck with a TH350 and 3.08's.
The test was valid enough in seeing what just a big aluminum head would do on it's own to an existing shortblock. Is it the engine you would build? Obviously not... but lots of guys want to upgrade one step at a time, so the test is realistic, just not ideal.
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The Vortec, iron head had more power and torque until 3100 rpm. That is the place most street engines live - thus, if you had those aluminum heads on your Corvette (and I had similar ones), you'd lose power and economy in your day-to-day life for marginal gain on a track
not sure how you're missing the point
The iron vortec head is better at low rpms and the AFR heads are better at high rpms. Quite simply the flow on a vortec head would become a choke point at rpms about 4500.... I have have some pretty cool flow-modeling done by my wife that demonstrates this....
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Originally posted by SuperBuickGuy View PostI agree with what they said, but I think they're utterly on crack when it comes to their rationale. The Vortec, iron head had more power and torque until 3100 rpm. That is the place most street engines live - thus, if you had those aluminum heads on your Corvette (and I had similar ones), you'd lose power and economy in your day-to-day life for marginal gain on a track. Funny thing about racing road courses around here... you're at full song for maybe 10 seconds of the 1m 30s lap. The issue is they compare a Vortec head that rules the street world and took it to the race world. My problem with their result is if you compared the result of that Vortec head with an AFR or Trick or pretty much any non-Chinese head the Vortec head would suck down low AND on top. Honestly, on the track the aluminum head would be useless - they don't even weight that much less then the iron head.
The comparison was bogus because, again, they're not comparing items designed for similar purpose....
I'm not sure I follow your rationale behind saying that losing weight AND and making more HP being useless... must by a typo!
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I agree with what they said, but I think they're utterly on crack when it comes to their rationale. The Vortec, iron head had more power and torque until 3100 rpm. That is the place most street engines live - thus, if you had those aluminum heads on your Corvette (and I had similar ones), you'd lose power and economy in your day-to-day life for marginal gain on a track. Funny thing about racing road courses around here... you're at full song for maybe 10 seconds of the 1m 30s lap. The issue is they compare a Vortec head that rules the street world and took it to the race world. My problem with their result is if you compared the result of that Vortec head with an AFR or Trick or pretty much any non-Chinese head the Vortec head would suck down low AND on top. Honestly, on the track the aluminum head would be useless - they don't even weight that much less then the iron head.
The comparison was bogus because, again, they're not comparing items designed for similar purpose....
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Engine Masters Tests CNC-Ported Heads Against Vortec Heads On A 383 Chevy To See If The Performance Gain Is Worth The Cost!
Ever been bench racing with some buddies and come up with a build plan? Does it usually sound like, “I’m gonna build a (insert engine here) and I’m gonna run this intake, these heads, and it’s going to make reality times three horsepower!” Yeah…I’m guilty, and a lot of you might be too. It’s like fishing in […]
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