Gain from Stock 452s to OOTB Stealths?

[Canyon707]

who has a track record for ports the performer?

 

[bobtile]

If you go with the stealth, I would recommend changing the valves as well. The valve broke off at the head.

 

[Gpuller]

Still got those heads Bob?

 

[747mopar]

That's ugly!

 

[Mike Gaines]

From my recent experience....upgrading your heads (porting your Iron Heads or Installing a pair of Stealths or Edelbrocks won't make your car run that much faster in the 1/8th or 1/4 mile. It takes a lot more than just the heads to get any major improvement.
Here is my 2 cents worth....
If anyone is spending money on heads I would ONLY buy INDY EZ heads with Max Wedge Ports, then make sure you got the right springs for your cam, then buy a INDY Max Wedge Intake for your 4150 carb and a set of 2" Dougs Headers with 3 1/2" collectors....then, when you want to go faster (WHICH YOU WILL) you will have the heads, intake and headers to do it....don't waste your money on parts you will only want to improve later.

 

[bobtile]

Still got those heads Bob?

I'm having them repaired and putting Manley valves in them.

 

[Gpuller]

I'm having them repaired and putting Manley valves in them.

My early Christmas present. Thanks!

 

[Tex013]

heres my 2 cents worth . I rebuilt my 440 in early 2008 and due to money reused my mildly prepped 906 heads , 3-4 months later I bought Stealth heads . I pocket ported and cut the chamber size on these to match the 906 and ran them with supplied springs retainers etc . The car went from 11.80's to 11.60's . This was with a purple 509 cam . I ran this till 2012 when I fitted a soild ft cam - new springs and retainers/locks . I then fitted Source CNC heads to same motor in 04/2013 . The original heads are now on another 440 with a 240ish@050 Comp solid ft cam
I run my Satellite as my daily driver as well so it sees all types of traffic and highway .
There is power to be gained from swapping , plus weight saving .

Tex

 

[IQ52]

Well here is my experience with swapping from stock 906 heads to ported 516 heads on a low compression 440.

http://www.forabodiesonly.com/mopar/threads/dyno-testing-a-stock-1972-440.249866/page-3

Notice that the peak to peak horsepower difference, from post 43 to post 44, is 62 horsepower. This is with a cylinder head swap only.

 

[66Satellite47]

"Back in the day" I used 906's & 915's. I began with stock 906 & over a few years ported them myself with no flow bench. I got good results. Mine were generally comparable to to a fellow racer who had a flow bench (generally using 452's). We were among the fastest BB Mopars in the area. I got about 10 MPH improvement over stock heads using the same 585 lift cam. I currently have EDE Performers & in stock form, I think they must be pretty close to the heavily ported iron heads. Keep in mind the aluminum heads want about 1 more point of compression just to equal the thermal efficiency of iron heads. I'd go aluminum and have them checked out before bolting them on as previously suggested.

 

[IQ52]

Do you have any tests that confirm the, "1 more point of compression just to equal the thermal efficiency of iron heads," theory? Because I can produce tests that indicate a horsepower increase at the same compression ratios and flow rates.

 

[66Satellite47]

IQ, Nope just what I've read over the years & the known fact that aluminum dissipates heat faster than iron. but you're an expert, not me.