Dart "as cast" test
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TECH Junkie
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From: Clayton, North Carolina
Dart "as cast" test Ran one of our 402 crate engines with a LS2 intake and 90mm throttlebody. It had dyno headers with bullet mufflers. BS3 control.
Testing corrected to SAE OE standard. (same as Z06 505hp engine)
Dart head is 2.05 valve
5.3 CNC head is 2.08 valve
Dart 225--------competitive priced 5.3 head
rpm--tq---hp-----tq---hp
3000-428-244--407-232
3500-412-275--399-266
4000-465-354--447-341
4500-487-417--472-404
5000-490-467--472-450
5500-473-496--459-480
6000-446-510--428-489
6100-440-511--422-490
6200-433-512--415-490
6300-425-510--408-489
6400-417-508--399-486
We will do some mild port changes to see how they respond.
Dart head as tested: $1,630.50 retail,ready to install.
Kurt
Testing corrected to SAE OE standard. (same as Z06 505hp engine)
Dart head is 2.05 valve
5.3 CNC head is 2.08 valve
Dart 225--------competitive priced 5.3 head
rpm--tq---hp-----tq---hp
3000-428-244--407-232
3500-412-275--399-266
4000-465-354--447-341
4500-487-417--472-404
5000-490-467--472-450
5500-473-496--459-480
6000-446-510--428-489
6100-440-511--422-490
6200-433-512--415-490
6300-425-510--408-489
6400-417-508--399-486
We will do some mild port changes to see how they respond.
Dart head as tested: $1,630.50 retail,ready to install.
Kurt
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TECH Junkie
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From: Clayton, North Carolina
All testing was done on a engine dyno. The numbers are rated at the flywheel. Sorry....
Kurt
Kurt
Originally Posted by 11 Bravo
Sweet. I bet you could get 530rwhp at least with a fast 90mm intake. Excellent for a $1630 head 
Originally Posted by 427
All testing was done on a engine dyno. The numbers are rated at the flywheel. Sorry....
Kurt
Kurt
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TECH Junkie
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From: Clayton, North Carolina
Hyd in the 24X @ .050 range. Have not tested the Dart on small camshaft.
Kurt
Kurt
Originally Posted by AINT SKEERED
Was this done with a small cam? I am trying to decide on the 205 or the 225 heads for my stock shortblock f13 cammed car. Low end tq is not my main concern as I have 4.30 gears for that.
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Ditto on the TF heads and what about any testing on Edlebrock, or did I miss that post? C'mon Kurt, we all know you guys are no bullshit results givers, just call it as you see it.
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TECH Junkie
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From: Clayton, North Carolina
I added a third set of dyno numbers for Edelbrock intake with Pro-systems carb.
Originally Posted by 427
Ran one of our 402 crate engines with a LS2 intake and 90mm throttlebody. It had dyno headers with bullet mufflers. BS3 control.
Testing corrected to SAE OE standard. (same as Z06 505hp engine)
Dart head is 2.05 valve
5.3 CNC head is 2.08 valve
Dart 225--------competitive priced 5.3 head--Dart head with carb/Eldebrock intake
rpm--tq---hp---tq---hp---tq---hp
3000-428-244--407-232--387-221
3500-412-275--399-266--392-261
4000-465-354--447-341--444-338
4500-487-417--472-404--487-417
5000-490-467--472-450--501-476
5500-473-496--459-480--484-507
6000-446-510--428-489--454-519
6100-440-511--422-490--448-521
6200-433-512--415-490--443-523
6300-425-510--408-489--435-523
6400-417-508--399-486--426-520
We will do some mild port changes to see how they respond.
Dart head as tested: $1,630.50 retail,ready to install.
Kurt
Testing corrected to SAE OE standard. (same as Z06 505hp engine)
Dart head is 2.05 valve
5.3 CNC head is 2.08 valve
Dart 225--------competitive priced 5.3 head--Dart head with carb/Eldebrock intake
rpm--tq---hp---tq---hp---tq---hp
3000-428-244--407-232--387-221
3500-412-275--399-266--392-261
4000-465-354--447-341--444-338
4500-487-417--472-404--487-417
5000-490-467--472-450--501-476
5500-473-496--459-480--484-507
6000-446-510--428-489--454-519
6100-440-511--422-490--448-521
6200-433-512--415-490--443-523
6300-425-510--408-489--435-523
6400-417-508--399-486--426-520
We will do some mild port changes to see how they respond.
Dart head as tested: $1,630.50 retail,ready to install.
Kurt
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TECH Junkie
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From: Clayton, North Carolina
Have not seen the TF or the Edelbrock head yet.
Our quest now is to find an affordable base head for our crate engine, so the price point has kept us testing ported GM castings until now. We will be testing another 5.3 CNC version and re-testing the Dart with mild portwork.
Kurt
Our quest now is to find an affordable base head for our crate engine, so the price point has kept us testing ported GM castings until now. We will be testing another 5.3 CNC version and re-testing the Dart with mild portwork.
Kurt
Originally Posted by strokedls1
Have you guys seen the trick flow heads yet? Just curious how they compare to the darts.
Originally Posted by AINT SKEERED
Was this done with a small cam? I am trying to decide on the 205 or the 225 heads for my stock shortblock f13 cammed car. Low end tq is not my main concern as I have 4.30 gears for that.
Originally Posted by GuitsBoy
While they do stack up admirably against the 5.3's, the numbers of both heads seem low for an engine dyno. Like somebody already asked, was it a baby cam?
BTW, Kurt answered the cam question earlier in the thread.
Sorry, didnt mean to get everybody's panties in a bunch. I did say that it stacked up admirably, didnt I? Im just curious, what with all the people claiming 15-20% drivetrain losses, why an engine dyno would seem to be comparitively lower than estimates based on adding in drivetrain losses to chassis dyno numbers. The gain from one head to another is impressive. To a casual observer, 523 engine HP (445 RWHP @ 15% loss) dosnt jump out as a powerhouse of a 402. Knowing that they dyno is somewhat stingy is useful information here. Much like knowing that a mustang dyno is going to dyno a bit lower than a dynojet.
So that there is no doubt:
GOOD WORK KURT! IMPRESSIVE GAINS!
So that there is no doubt:
GOOD WORK KURT! IMPRESSIVE GAINS!
TECH Apprentice
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From: Tinker till it blows, then back it off a notch, maybe!!
Has anyone compared Dart's flow numbers on their 225's with ETP's 11 deg. 215's ?
The as cast Dart's are not that far off (between 7 and 12 cfm lower across the board)
JMO but it seems that with just a little work, the Darts could get there.
That's if the numbers are accurate...
The as cast Dart's are not that far off (between 7 and 12 cfm lower across the board)
JMO but it seems that with just a little work, the Darts could get there.
That's if the numbers are accurate...