2 divided by the square root of 3

 

Just give Stan a call at FPA. He will tell you on the phone if he has what you need.

 

Here's a few to search-

http://www.summitracing.com/search/Part-Type/Headers/Make/FORD/Model/MUSTANG/Engine-Size/5-0L-302/?Ns=Rank|Asc

You may have to go with something that has an oval port, larger than your square ports.

http://www.summitracing.com/parts/PTE-H-8426-1/?rtype=10

Um, why are you usig these oddball heads in the first place?

 

Well, I think the OP is aware of his head choice as it's a dead give away toward the end of the very first line of his post. He prolly scored them on the cheap. In this day and age can't blame a guy for trying to save a few bucks to pay the mortgage.

I would call Stan at FPA and have him make a set using a flange plate with square holes. Or use manifolds that have been extrude honed. Bruce

 

what's so odd about the OPs choice of heads concerning the exhaust port?


i would recommend you order a couple different sets of headers from Summit as referenced above. Then you can get them in yours hands and compare (and try assuming you don't scratch them up).

Summit is very good about returns.

Given the budget minded choice of cylinder heads, i'm guessing a header from FPA probably won't make sense.

 

w

Given the budget minded choice of cylinder heads, i'm guessing a header from FPA probably won't make sense.

Yeah, when I was reading the responses I was wondering what people were thinking. Headers cost more than the heads!

BUT, I agree with others, aren't most head ports square?! I see no big problem here.

 

Not sure what I am missing here. I just pulled up some pictures of heads (Edlebrock), and all the ports look pretty square. Intakes were a little taller than wide, but exhaust looked pretty square. Age is affecting my memory, but I think my Sandersons came with square holes in the flange with round tubes welded to them.

 

MAC headers have rectangular ports. They're inexpensive and fit very well.

 

A square is a rectangle, but a rectangle is not necessarily a square. Those Eddy heads look pretty damned square to me.
And you could spend a couple of years reading up on ProComp lovers and haters. I don't own a set so I don't have a dog in this fight, but the floor filled 3V Clevelands look like something that could be messed with...

 

Well they must have changed things since I took mechanical drawing and drafting in school. A square has 4 equal sides and a rectangle has 2 longer sides and 2 shorter sides. The procomp heads have what looks like perfect square ports which you won't find on any of the other manufacturers heads. I can't beleive those heads will even breath.

 

the op said the port was 1.4 X 1.4. i don't think anyone was questioning if that was square.

is there a particular problem with a square port that causes flow problems?

 

headers for SBFs won't be round at the port when using the standard bolt spacing and primaries in the 1 5/8 to 1 3/4 size. the spacing is about 2" center to center. add in width for the bolt head and tubing thickness around 16 gauge results in probably a max width in the 1.4" range.

 

just gitsum uh dim headers with them 2" tubes and swallow the exhaust port ! :shocked: :loco: its complete and total :bs: ! :shaking: WWWWEEEEEEEEEEEEEE !

 

Square is a 4 sided polygon, all 4 sides are equal and corner angles 90 degrees
Rectangle is 4 sided polygon with all corner angles 90 degrees.
Parallelogram is 4 sided polygon with opposite sides parallel
Any square is a rectangle and a parallelogram.
Any rectangle is a parallelogram
A rectangle with 4 sides equal is a square.
A parallelogram can be a rectangle if the corner angles are 90 degrees.
A parallelogram can be a square if all sides are equal and corners of 90 degree..

I learned this in grade school geometry class.


When all is said and done chances are most of what was said is BS....learned that on the job!


Slim

 

I think you just proved what I said but with a bunch of bs thrown in. How long did it take you to go to the books to come up with all that crap.

 

I find it's best to listen to the engineer. I think he's spent enough time with books.


Now, that being said, I thought these chinese heads were all 'based' (copy) on another head. So do we know what they are based on?

 

well , splaine two me dis hear bass drome ! :shocked:

 

well , splaine two me dis hear bass drome !

What exactly does this mean? Is there some relevant content hidden in this? Does it relate to something in this thread and is supposed to be funny? I'm not getting it and would like some help.

 

Just get out the die grinder and make them squares rectangles.

 

Thanks all for the replies and suggestions,

Please lets not get into why I should/shouldn't have these heads, haha. I read for 2 weeks on these heads and talked to local guys that race with these and made my own decision about them, but local guys are not racing mustangs so header choices are somewhat more open for them. I did replace all the springs and had my machine shop go over them.

Now as for the headers, yea I may be screwed on getting a perfect fit header. I am aware of FPA and intend to call. Just based on past searches, I figure about $800 for those. Im not after every HP I can get. If I lose 5-10Hp by saving $400 on a different header, then thats what I will do.

But if it takes $800 to get my car going, thats what I will do also.

I only made the assumption that most aftermarket heads were square port, and that is why I'm dealing with this headache now, so it's not my heads, it was me, haha.

The "7 P's"

Mike

 

The "7 P's"

Mike

I'll take a momnet to break that down for you

Prior
Proper
Planning
Prevents
Piss
Poor
Performance

 

From everything that I have read in my, albeit quick search, indicates that as long as you can cover the the port with a round tube header, shouldn't be a problem as far as seal and use...the only "problem" is that it would require a 2" primary to make that happen (if I remember the pythagorean theorem correctly to calcuate the needed diameter). Not sure how good that would be for the torque, but should work.

Then you have to see about the point Buckeye brought up concerning having them bolt up properly with tubes that big...

Talk to Stan though..I know they are pricey, but he made the headers for my N heads for my '66. Quality and craftsmanship are great.

 

Yes. You do not want the exhaust flow to hit any raised ridge on the way out. You actually want a bit of a ridge from the outside-in as an anti-reversion tool.

 

headers

Mike, header to port fitment is frequently less than ideal. If your headmans don't fit the way they are .....what are you going to do with them ? I was going to suggest you send them to me, but I've already got some. BUT since this problem seems rather frequent, why not lay down a few beads with a TIG welder on the corner areas of the headers you have now and grind the inside of the tubes so they will work ? If you grind through, TIG the hole closed and grind some more. You'll need to be kinda heavy handed with the fill rod, but it may well be less costly than buying new pipes. LSG

 

if your looking to get every last bit of power from the engine you have you will need to have custom dyno tuned headers made like the professional racers have. of course thats very expensive unless you have your own dyno. for having fun just buy a set of name brand headers and have fun. if you want a an antireversion header buy FPA 1.675" into 1.75" into 3" collector long tube headers like i have. i have AFR 205 heads on a 392w. i dont remember if the header flange is round,square,triangle,trapizoid or bugeye. Stan at FPA has used mule engines to get the best overall power from his header designs. Stan is a ford guy and only builds and sell headers for fords. maybe i could get a few extra horses from my 392w but i dont have tens of thousands of dollars to spend on dyno time and tubing and the extra road apples will just make a mess on the street. buy a nice set of hooker,headman,FPA, etc. and have fun.

 

FWIW, the exhaust ports on my used Canfield heads I picked up are squarish at 1.25" by 1.25". I say squarish because it would appear someone has been doing some amateur porting to make them a bit rounded.

 

The ports are typically square on most aftermarket sbf ford heads I have seen....Since the pro comps are copies of an edelbrock vic jr head I have a similar issue with my vic jrs..I am running hooker 6208 headers which don't fit too bad but the ports are a little smaller width wise than the actual head port..If mine weren't already ceramic coated I would have had the pipes welded on the outside of the flange and ported them until they matched.

 

DUDE!!! I was trying to throw you a bone to save face. Anyway, AMC is part Dodge, part Ford, part International and who knows what else it all depends on what year you're talking about too. And yeah, them along with Dodge have had some pretty crazy exhaust port configurations alright. I'll bet header manufacturers pull their hair out more than once. Bruce

 

DUDE!!! I was trying to throw you a bone to save face. Anyway, AMC is part Dodge, part Ford, part International and who knows what else it all depends on what year you're talking about too. And yeah, them along with Dodge have had some pretty crazy exhaust port configurations alright. I'll bet header manufacturers pull their hair out more than once. Bruce

oohhhhh i cant save face , its way too late for that ! :shocked::shocked::shocked: ! < shocking isnt it ?! those AMC heads are from the early 1970's. thats before slowpar and others got involved. a bone aye ? o.k. bow wow bow wow ruff fuff burp ! exqueese me ! :shocked: well here it is , the #16 Roger Penske 1974 amc matadoor nascar. can yew say "bug eyed" ? get the RAID ! ha ha its ahead of a chebby, how imbarriseen !

 

Called FPA, left a message, no return call as of yet. How bad is it if there is a bit of reversion? Say the headers fit well top to bottom and there is some overhang on the sides by about .150- .250 tho? I can find a few headers that will work but there is going to be some overhang about in that range.

Mike

 

Can you do some grinding on the header flanges?..Get a gasket that fits the head ports and lay it on the header flange..Grind it as close as you can to the gasket size...I was stressed about this problem too..I was told by a big name engine builder(Joe Sherman) that most of the exhaust flow tends to come out the center of the port and the small overhang along the edges wouldn't make that much difference..

 

most headers i have seen have the tubes go through the flange and then welded to the flange on the cylinder head side (then surfaced). if you grind in the tube to widen you will be going through the tube.

i have FPA headers and cylinder heads with the standard ford bolt pattern. Fox Lake ported the heads to match a Fel-Pro 1415 gasket (1.25" X 1.48"). it doesn't have a step into the header but the headers are dimpled where each bolt is, to allow clearance. so i basically have a step/irregularity in every single tube anyways.

who on VMF with heads using the standard SBF bolt pattern, don't have dimples in the tubes next to the header for primaries equal to or larger than 1 5/8"? or are just my garbage FPAs that do this?