no offense taken,,, ive just seen this often in my 20 years of doing heads,, everybody in the country,, big name or little cant get close to your numbers,, usually ports are down so far from claimed numbers they arent what the pros or usually people get,, but maybe youre the guy who disproves that

p-5 heads dont flow that much, an inline head with pushrods where they need to be,,,, hard to believe you could get those numbers,,, id like to see it,, if they flowed those numbers,, id do that job for free

I have been playing with heads on my own for 25 years give or take....I have read, watched, listened to everything I could get my hands...I always took all I could from all this but never held anything for gospel....if we all only did what we know was pro en in the past then that would be where we stayed....I always questioned everything and wanted to find out for myself if it worked or not....then wanted to know why. I was never afraid to trash a perfectly food and expensive head just to.play around.....when the CV-SP heads first came out I bought a set of 330's just to trash....when I first started doing dirt track heads as a kid I did things everyone else considered taboo and said wouldn't work. They were 9:1 358's with 1" in from seat porting allowed....650 carb on methanol.....when I started they were making on average about 435 HP.....heads....at that time I used a 110.....were flowing around 125....I did a few sets and shortly they were going near 165 and the best engine we did made around 575hp at right near 7200....just were the pinch 'said' they would and made just under 500 ft/lbs.....all from what most people said wouldnt work.....that was about 1989.....these engines would walk the rest of the field and in no time have almost a lap on everyone else....and again....that was what EVERYONE ELSE said wouldn't work and very limited porting...my point is why did they all say it wouldn't work....because that is what they were told...I wasn't afraid to see for myself....and it worked....I don't think I am anything special....I just am not afraid to try what sometimes to me even doesn't seem like it should work.....even bad results teach us something....either it works or not...if we can get past this then all we can do is learn....the port is DEFINITELY different...but so far it has proven to work....although finished is a long way off....

The port actually does not like a lot of unshrouding.....move the head on the bench so the valve moves off the bore wall and flow drops SIGNIFICANTLY...

give me some more time and I will hold you to that freebie!

Like I said before...the port is not excessively large....right around 300cc....it is definitely in the shape.....and best results are not always produced by removing material.....

If it's not top secret, what size valve???

And there will be no converter behind this.....

Larger than most......wink

Large valve and large throat(as evidenced by the low lift flow being off as compared to other heads....but taking off from around .700" lift on)...bowl not excessively large, chamber quite small but both shapes making a lot of difference....

I believe the P5 would get there....and quite easily....pay attention to the bias of the P5....and the P7.....air does not know through what kind of head it is flowing unless you tell it.....and even then how would it know if you were lying.....?...

I was wondering what valve angle are you using to get these great numbers and how much did you move the guides over to make it work? A huge valve with 1.00" lift will almost hit the side of the cylinder wall killing flow... I can't wait to see a complete set on a running engine. My W-9s flow a lot less than most "experts" heads do, 30+ cfm less, but they are almost always 3-5 tenths or more slower than me and with way bigger engines to boot! Not trying to be too negative, I just want to see it at the track, that's where it really matters. Good luck and please keep us posted.

I would love to see this head on my bench if it can do what you say.

I agree....if you read my posts you will see that that is what I keep saying.....even though they move some air this really means nothing until proven....thanks!

All Superflow flowbenches should flow within a few cfm of each other if they are calibrated...which mine is... regardless of altitude, temp, humidity etc....if your bench is calibrated I would suspect our results would be similar....I do this for personal satisfaction and am simply sharing my results as others have done.....I do not intend to be braggadocious or disrespectful to others.....I respect their efforts and results...obviously I wish that I would have some of the low lift flow numbers they have attained but I have not been able to quite reach them.....there is more to airflow than theory or all our ports.would be perfect and the same....I believe in letting the air tell me what it wants to do rather than vice versa.....perhaps I am wrong but that is where I have seen the greatest strides in improvement....

the low and mid lift numbers are in your valve, valve job angles, and chamber

im sure you have a 55 degree seat or steeper on that to get those numbers,, with hard coating the valves ive run as much as 60 degree seats,, maybe you have that,,, which hurts low lift bad...

its just your claims are off the charts,, nobody is trying to say you arent qualified to port a head or whatever,, its just unheard of to beable to get a port in that head,, that big,, to flow that amount of air

and to the guy who asked about how much you moved the guides,, or how big of a valve,, he must not have read that earlier you said you didnt do any of that,, the head is mechanically as recieved from mopar..

im doing a d-3 ford program with a 2.250 int valve on a 4.165 bore for a nhra comp project,,, if i get the kind of numbers you claim out of a better designed head,, ill be great!!! 373 inches,, 450cfm,, should be enough to make 1040 hp at 9500rpm

You are correct.....55 seat, large throat....in the area of 95-96%.....not concentric so that is an estimate....and I never claimed to be a head porter....just a hobby....and u take no offense to any of the debate on here....I am not a big proponent of big low lift numbers anyway...but if I was inflating my numbers on purpose you could bet they would be higher...I know very little compared to some of the best out there I just like to say....why not....and give it a try...I won't patronize you by wishing you luck on your endeavor......wink

As for "changes" to the factory head....I do not want to mislead.....the valve is not 'stock' and the head is rolled....that is a whole other topic of debate....but there was no welding, moving guides etc.....I wanted to push the head but within the confines of the casting and something that someone could do in their garage....most do not have the capability to change valve angles or offset guides at home.....