ya know, i totally agree........ *coughirun11scough*

 

Nothing wrong with that......

http://www.chevyhiperformance.com/techarticles/41598/

Decent article on stock vs. aftermarket heads, check the info on the bottom of the page.

What kind of flow numbers are your "305" heads generating ?
Just ball bark figures..

 

Mandangelo

I would like to see your proof. I have done alot of research over the years and have never seen anything to back you up. If a guy knows what he is doing(and i personally know 1) he can port just about any head to out flow any head that is manufactured. And as for the aftermarket they still have room for improvement. Now I also have seen what some people call porting, that was nothing more then grinding in a few spots.

 

Well, glad you asked!

Here is info that F-Bird'88 has compiled using a flow bench run by a friend of his in Hamilton, Ontario, who does work for CASCAR.
______
Only have the flow numbers for the "081" '87/'91 305 heads.

They flow:

195cfm@.500 in.(182@.400") and
110cfm@.500 ex.

Other stock 305 heads with 1.84"in and 1.5" ex valves
will flow real close to this as this is very typical.

The last set of 305 heads I ported and flowed were
"416" castings and flowed:

225cfm@.500 in. and

140cfm@.500 ex.

through 1.94x 1.60" valves.

Should give you an idea of where you're at and the potential.

October 17, 2002

The latest set I did with 1.94 x1.60" valves flowed 238@28" in
and 189 ex.

Thats not too shabby for something that you'd throw in the garbage.
Even my friend with the flow bench was shocked. "This thing must be leaking or something!!"

We flowed a set of Brodix -8's and a set of 2.02 Vortecs
at the same time so we know the bench was operating right.
Outflowed the unported 2.02 vortecs and a set of mildly ported
041's.

If it ever stops raining here:
I will be getting them on the car (with a few other mods
single plane intake .550" lift solid cam, 12.65:1 cr)
and will report on their performance.
My vortecs (Set A) are coming off. Flow was 228@28" on these vortecs and it runs 13.05. Won't be a direct comparision but...

Looking for a 12.6? et at about 108mph
I'm curious to see what these 305 heads would do on the dyno
also.... maybe some day.

In my opinion these 305 heads have a little more potential
than the common open chamber smoggers if you're willing to
put the work and bigger valves into them. The combustion chamber size and shape is better especially after a lil reshaping (unshrouding). The ports are about the same.

Note: These 305 heads are not lightly ported. a lil pocket port
will not cut it. Plan on removing some metal.

lift cfm
.100 70.1
.150 105.2
.200 135.27
.250 158.6
.300 187.0
.350 205.41
.400 222.11
.450 225.45
.500 225.45
.550 218.77
____________________

And he is getting sufficient flow lately to produce over 500 hp on a perfectly balanced engine. That equates to flow of 243 cfm @ .500 lift!!!

(Just by way of comparison, stock L31 Vortec heads flow 228 cfm at .500 lift on the intake side, and 140 cfm on the exhaust side.)

So let's see how much hp F-Bird'88's recently ported 305 heads can produce.

In the February 2002 issue of Car Craft, on page 54, under the "How to Port Cylinder Heads" article, they state that AirFlow Research has quantified the question of Air Flow = HP with a formula, which they claim is "fairly well established." It reads thusly:

hp = cfm x 0.2575 x number of cylinders.

So just plug in your numbers and it should be pretty close.

243 cfm x 0.2575 x 8 = 500.58 hp!!!!!

WOW!!!!!!!!!!!!!

That is well beyond any stock set of Vortecs

And he was selling these heads a couple of weeks ago for a MERE $375 US, plus shipping!

So who says you need to spend serious coin to have an excellent set of heads, eh???

 

I will read all info that you have provided, so far seems impressive although ya bottomed out at around .450. Almost identical to stock vortec's.

 

just for the record, I have 305 heads in the garage that are collecting dust, I went aftermarket heads <Surprised ?>.

World Sportsman's 200cc / 64 cc / 2.02/1.6. $ 800.00 including tax and shipping. If someone is looking for heads I'll sell my 305 heads dirt cheap..


Hot Rod..

What kind of proof are you looking for ? Flow numbers ?

http://www.chevyhiperformance.com/techarticles/41598/

 

[QUOTE]Originally posted by Mandangelo
[B]
I have researched plenty of flow numbers from chevy castings, especially L98 heads..Stock vs. ported vs. budget after market heads...and the non-ported budget heads have always proven that they "narrowly" out flow theprofessionally ported/polished stock castings.



I didn't see any flow #'s on that

 

Hot Rod

Once ya click the link, go to the bottom of the page where it says "Sidebar Articles", they have flow benched several categories of heads,,,

Let me know whatcha think..

 

I have read all that and found nothing saying that an unported head flows better then a ported one. I also found this for you to read click here
It shows how 10 hours of work improved the horsepower and was done by a 1st timer. Now can you imagine someone spending 40 hours + and knows what they are doing?

I also found some other info about porting by doing a search in the magazine search box.

 

Did you see the flow nubers ? ? That was my point.....

My heads are listed and they give flow numbers that are in excess of sitting bull's fully worked 305 heads...even though the numbers he has provided are impressive.

My "OPINION" is that when you add the cost and time that many people would be better off going with aftermarket heads.

You guys may be the exception, but for the price <$800.00> for a fresh set of heads, that are proven to flow fresh out of the box for a meger $800.00 shipped to your front door, in my eye's thats not a bad deal.

 

How about donating them to research.... I'll show ya how to turn them into a high flow high velocity hi performance head
that will equal or outperform Out of the box Sportsmans for about half the price.

 

Mandangelo,

Come on man! Give it a try! You will have more fun than you can shake a stick at and end up with a terrific but inexpensive set of heads

Let F-Bird'88 show you how. Go through the thread at the end of my sig--you CAN do it! There are probably a dozen different people on thirdgen who are now in the club of successful home-porters.

For folks on a budget (and who isn't these days???) this is a certified path to FUN with ANY smallblock Chevy! F-Bird'88 even has a guy running them on his 400 ci V8, and he is happy as a pig in muck

What have you got to lose??? Even if you don't want them for your own car don't you have a buddy who could use a great set of heads but can't afford $800??? We ALL do!

Come on--everyone will help you out if you run into a snag. We're here to help ... that's the reason for this board :hail:

 

Those are pretty decent numbers,a lot better than I would have expected,thats about what a 2.02 double hump head would do after a clean up and pocket contour job.With a big enough cam I think a person could get 400 hp.

 

yea sorry i was gettin a little pissed earlier in the thread guys... my bad... my apologies... but yea mandangelo.... you should try to work those heads... try to get them to outflow your sportsmans....even if they didnt outflow them, at least now you have some experience working with heads.

 

How do I tell if the TPI I got is pre-87 or newer?

 

If it is 87 or newer the base plenum will have bolt angles that provide a straight down path to the heads.

If 86 or older the plenum will have bolts that go into the heads are an angle.

 

I some what have a new opinion on these "305" heads ! To who ever ports these heads....Great Job ! Very Impressive !

All in all i enjoyed this post, some very insightful information was posted and i wish all of you guys the best !

Good luck to all in the future and stay safe !

BC

 

OK, its pre-87. Is there anything special I need to know about it?

 

Probably this question would ellicit a better answer on the TPI board.

 

ok, sounds good to me. I guess this ends this thread...