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Here's some link to 383 builds Magazine Builds

Most engines fall way short of Max hp per cfm (from what I understand is around 2.5 hp:cfm) most don't even make 2 hp:cfm.

Are those your 355 W2 ? From you signature, sounds like a pretty sweet setup, like you didn't go 4". Velocity, cfm, port volume are all interrelated if you know any two you can basically calculate the third like everything it's about balance.

Making a 383 into a 408.

I remember that one, was a nice build.

When I said least restriction, I didn't mean no restrictions, I meant generally the least restriction that will perform how you want. Whatever that want is. Eg. Say 650 gives you everything you want a 750 would only gain a couple of hp and a 500 kills 20 and gives a similar experience...

How far off is the average guy with a decently built and well tuned engine from being an ideal atomization, vaporization etc.. Machine ? And how much HP could one expect to gain refining their combination and how much time money and energy would it require to do so ?

But if you feel what is needed is 1.5" hg for street, how's wanting the least restriction to get what's needed wrong ? (needed is 1.5" hg in this case)

That's nice little summary, but so what, excess reversion is only a problem if you got an excess, and the power lost would have to be high enough compared to any gains from the mods, there's compromises to be made everywhere.

He generally doesn't make points or answer questions directly, he answer with question like he's a Professor or something trying to lead you to his point if he has one.

It's how you look down at anything people are doing compared to these world class builders but don't seem to hold yourself to the same level. And ?

Do you hold yourself to these top 1% of builder (pro stock nascar f1) level of standards for your builds ?

Pretty awesome what some teams did with them. Seen AMC welded like 3 heads together to make their Pro stock heads.

Why you straw manning me. Both these are way low on my priorities. If you make decent choices these are relatively taken care of.

I agree a lot of race teams did that but your average builder didn’t and the stock engine definitely didn’t and they dyno higher than any of the other muscle car small blocks with a relatively small cam.

I never made the case for importance of flow bench velocities, (That's DV and Chris) actually my point in this thread is somewhat contrary to DV and others. I do tell me more about how I think or know lol These aren't my formula's I ain't making the case that there 100% correct but they are...

No, So ? Point ?

I give what is it ? According to the chart it starts around 210-215 fps and lower which are generally fair size ports you'd have to go way out of your way to install. 215 fps would be 2.39" ave csa, that's bigger than a 190 trick flow, on a 5500 rpm 318.

My point is your always champion the small, carbs, heads etc.. Always citing velocity but you don't seem to know what the ideal velocity. Yes there's more to a running engine, the whole point of this thread velocity is important but it's at the mercy of what generally available/doable options...

Here's a list of velocities don't know how accurate the description are, DVs in the video seem to run higher. 318 @ 5500 rpm head cfm need works out to be 214 cfm. Csa = cfm x 2.4 / fps 1.47" cas = 214 cfms x 2.4 / 350 fps too much velocity 1.65" cas = 214 cfms x 2.4 / 211 fps highest usable...

So velocity is important we (you) just don't how much velocity is needed but were (your) definitely sure that smaller is definitely better cause it causes higher velocities and possibly/probably too high for some applications require, what application we (you) don't know but let champion the...

So it's getting 110+ VE% making 1.4 + lbs-ft per cid it's at the optimal velocity for that displacement and rpm ? If not what would you even say is the optimal velocity for that engine?

There's many ways to run 12's with a 318, what velocity are those heads running at ?

Are any of the ootb heads available to us have velocity in the ideal range for there given flow vs port volume ? Which I don't think any of them are which means your unable to ever build to optimal velocity, unless you modify the head for more flow for a given size or less size for a given...

Ideally, but practically we got about a half dozen heads to choose from.

From Chris Speier site This is probably the most asked question I get. What size head do I need?? While head CC's are a by-product of a properly sized cylinder head, there are mathematical formulas to lead you to the correct answer. There are many reasons that choosing a cylinder head based...

I think that stuff pretty kewl, I like looking at old Pro Stock small blocks the crazy mods they would do to the heads. I was watching a video that some guy that collects Cleveland pro stock engines was showing the work that goes into those heads and a video on Hemi I think super stock heads by...

If I remember right your mainly dealing with max performance out stock parts ?

But I think for most of us, that aren't bound by strict rules and highly competitive racing, the average performance guy. To build an engine with Slightly less inefficient HP is generally gonna be easier and less expensive to build. A highly efficient 1.35-1.65 lbs-ft per cid is generally gonna...

I'm not saying velocity not important, just for most part we have vary little control about it. Plus look at the Cleveland and it 4 V head and 302/351 Boss these engines have to be one of the biggest examples of too much cross section for a given cfm for engines of small medium sizes generally...