If you post up the observed power and torque numbers and your fuel flow numbers it’s easy to see if the numbers are close.
You can’t use the corrected numbers, it has to be the actual observed (or measured) numbers.
Horsepower question
- Thread starter Paul Davidson
- Start date
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If you post up the observed power and torque numbers and your fuel flow numbers it’s easy to see if the numbers are close.
You can’t use the corrected numbers, it has to be the actual observed (or measured) numbers.
You would have to have decently ported heads to get 470 hp especially with 1.92 valves. Are they factory magnums heads or Eq's etc.. ?
stock eq heads supposedly from Australia
Eq's are pretty good heads but 470 hp seems too much if the heads are stock.
Do you know what the rest of the combo is ?
340six
King Of Bling
Why do you have to bring facts onto play?
MOPAROFFICIAL
If it has tits, it's a liabilititty.
A friend of my dad bought a ford blueprint motor.. and it ate itself 3000 miles later.
3rd time someone i know had one fail.
I steer people away from blueprint.
While it is feasible to get that kind of horsepower from those head and valves if professionaly ported along with a professionaly ported intake manifold and carb, it is unlikely. If it is all true, you have a well built engine.
Dartswinger70
Well-Known Member
Lots and lots...
harrisonm
Well-Known Member
I find this to be a rather strange question. It's kind of like saying, "I want to build a 408 and get a lot of horsepower from it, but I insist on sticking with these small valve heads. OR I insist on sticking with a 650 CFM carb. Maybe that is not what the OP meant, but that is what it sounded like to me. If I were going to build or buy a 408, I think I would start off with figuring out exactly what I wanted. A 408 can come in a WIDE range of HP and Torque variations. What is my goal? 425 HP, 475 HP, over 500 HP???? Then I would research the best parts to get me there.
Then I read a little while later that the OP already knows the HP and torque. So is he asking how much more HP he can get if he sticks with those heads?
Actually, I would just call @BluePrint Engines and have them help me.
Then I read a little while later that the OP already knows the HP and torque. So is he asking how much more HP he can get if he sticks with those heads?
Actually, I would just call @BluePrint Engines and have them help me.
I think he's looking at a Stock EQ headed 470hp 408 but the hp sounded kind of fishy, so he went the hard way to get us to verify it
Woody500
Well-Known Member
Is it possible he stayed with smaller intake valve to have more torque(am I right that higher port velocity means more?) and then decided he needed horsepower and doesn't want to change valve size? Wouldn't a gear change, instead of smaller valve, have helped that, if that's his goal?
He never stated usage or goals except 470hp? Or did I miss that?
He never stated usage or goals except 470hp? Or did I miss that?
I have never seen torque and valve size correlate
The problem I see with this whole velocity discussion is not many seem to actually know what velocity is desired and or how to get that velocity, there's just this vague sense out there more is better and if not it's better to have too much than not enough. Now I'm still figuring this stuff out myself but seems to me most are being overly cautious, not like were building Boss/tunnel port 302's over here, and I have a feeling too much cam is worse than having bigger port (valves) for X Hp driveability wise.
more gear isn't equivalent to more power
I think the OP just wants to know if the dyno results for a 470 hp 1.92 valved 408 sound possible.
Woody500
Well-Known Member
A gear change just puts torque where you can better use it, is what I meant by that. Am I right?
TT5.9mag
Two atmospheres are better than one
Open ended question with way, way too many variables to answer. I made 1256 wheel horsepower on a 2.00 intake valve. You’d all call bullshit on that if I didn’t tell you I did it on 26 pounds of boost on methanol. @Paul Davidson do you have a build sheet? It wasn’t uncommon for ported EQ (real EQ) heads to get up near 500hp.
I see it as, gears is for where you want the hp to be (mph).
A rock crawler 4 x 4 will try to gear so peak power is near crawling speeds 0.1-5 mph, for a street car you want the powerband accessible at normal street speeds 20-80 mph, drag racing you basically want what gives the most average power to the ground.
I asked the OP for more details that's all he's given so far.
Woody500
Well-Known Member
Gearing for top end at drag strip still requires that on upshifts rpm drop should be a little lower than peak torque, so next gear pulls, using the torque to gain back the rpms to peak horsepower.
I should have mentioned that earlier, for road course is what I was referring to, as my experience there has shown shifts near torque peak best for that. And engines with narrow power bands require it. All depends on combo, of course.
And OP never did say what use he intends.
I also remember someone on here mentioning splitting shifts on an OD setup to get the gearing best for drag racing with his combo. Since gear ratio choices are limited for many trannys, that might be a good work around, if you've got the axle ratio close.
If he wants to know if the dyno lied he should have just asked that. Why beat around the bush. I’m sure he already knows the answer. Kim
Only if the smaller valve is used with a smaller port, think tractor torque. lol
Woody500
Well-Known Member
That size valved head good for a 318, right? At least that's what someone on another thread mentioned, IIRC.
Depends what your trying to build, Max workable valve size for a wedge chamber is suppose to be around 52.5% of bore so 3.91" = 2.05" 3.97" = 2.08".
That's exactly what I'm asking the motor is a 408 with 9.9 to 1 with a cam specs .555 in and .549 ex duration 290 in 292 ex and what appeared to be bone stock eq heads is this enough to give an educated guess I'm skeptical of the numbers also tq was 505 at around 5600I think he's looking at a Stock EQ headed 470hp 408 but the hp sounded kind of fishy, so he went the hard way to get us to verify it
PRH
Well-Known Member
You’re going to need to post a sheet with the data on it(not a tq/hp graph) if you want any kind of even remotely meaningful assessment.
Fwiw- 505tq @5600……. That’s 538hp.
The other way to look at it is……… you’re buying an assembled/running pile of parts.
If the pile made exactly what you thought it should make for power……… is it worth the asking price?
If it is…….and you want to buy it…..buy it.
If you took it to 5 dyno shops and got 5 different results……. It’s still the same pile of parts.
33IMP
Well-Known Member
Additional Info added.
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