How much horsepower can ya make with a 408 with 1.92 valve heads
Horsepower question
- Thread starter Paul Davidson
- Start date
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Ant
Well-Known Member
All of the horsepower.
Its compression that makes power.
HP depends on a combination of factors, more than what you listed. This is why we have dynos, to test the combination of parts and resulting HP.
SSG_Karg
Enhanced member
429.4hp. What do I win?
SSG, you are good.
gzig5
Well-Known Member
What do the heads flow on the intake ?
More than a Briggs and Stratton.
Slightly more than an average tractor. or a little less than a 360 with a 2.02 valved head.
Why choke a 408 stroker with a small valve?
Why choke a 408 stroker with a small valve?
What about cylinder head flow?
9.9 compression as far as i can tell stock castings capable of .610 lift
crazydog
Well-Known Member
Not as much as a Blueprint Engines 408 with those stock Edelbrock heads.
How much horsepower do you want to make?
Take it to a track and you'll know.
Carburetor cfm, intake manifold, cylinder heads and what's been done to them, compression ratio, cam lift and duration, ignition system, stock exhaust manifolds or headers. With this needed information you'll be given alot more help. Valve size by itself is useless.
And you know this how? You don't even own a Mopar and you feel like you can give advice? Go crawl back under the rock you came out from under.
Other than a big torque monster that stays under 5000 rpms there would be no point building a 408" and using a head with a 1.92" valve.
I've sold a lot of 408" & 416" assemblies and most have had either a set of TFS or Indy heads put on them.
If you want to use a 1.92" valve build a 360
If you want a 408" use a good head with at least a 2.02"
Tom
I've sold a lot of 408" & 416" assemblies and most have had either a set of TFS or Indy heads put on them.
If you want to use a 1.92" valve build a 360
If you want a 408" use a good head with at least a 2.02"
Tom
Everything to increase volume adds up to power by increasing compression. But compression is the biggest factor on a engine.
You can achieve it various ways. Pistons, Boost, air flow or nitrous . The more volume you compress into a smaller area the more power you make. Head flow increases volume as do other modifications you add to achieve more compression. But higher compression is the ultimate goal .
The more you compress the more power you make. One reason why, when they lowered the compression on later engines they lost tons of horse power just to run lower grade fuel. The offset is the more compression you make the higher octane / slower burning fuel you need to prevent detonation.
Such as a diesel, the compression is so great you don't even need a spark plug. It detonates on its own. Try and light diesel fuel with a match without compression
Like I said in the post above "Compression" makes the power, How you achieve it is a process to figure out on any engine. Putting big valve heads on a low compression engine is a waist. But remember there is no replacement for displacement.
Not exactly. How you get compression is as important as compression itself.
Compression and burn rate are not related. RPM is a far greater factor for burn rate than compression.
Obviously an engine needs compression to work but if your gonna give value to only one aspect for hp it would be air flow, you can have a high cr low hp engine and a low cr high hp engine the difference between the two is the air flow (fuel). Higher cr is just more efficient with a given amount of fuel and air.
thank you thats what i was wondering
thank you i have a dyno sheet that says the motor i have made 470 hp and 505 tq and im skeptical
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