theres probably going to be a lot of bashing and trashing here asking about the 440 source stealth heads. im potentially in the market for some avg. guy alum heads and its 1000.00 for the stealths or 1500.00 for the eddys. id be changing springs, retainers,locks, checking valve job etc with ETHIER heads. whos got the stealths and whats to know about them? any tricks? the straight plugs help my pistons and headers... lookin better than the eddys at this point.....!!

My Dad runs them....loves them.....had to clearance for the pushrods.....changed to better retainers. Other than that....he runs 11.30's all day long with them....on pump gas.

cool nice car BTW

I run them on my 470 stroker. I got a set of the first run of them. I welded up the chambers to run the gaskets I wanted and then ported them. I had my machinist give the a 3 angle valve job, narrow the seats and shave them .075.

I had to change the retainers and locks after running them for a while.

It runs 6.40s in the 1/8th. I v'e been happy with them.

i've run mine for about 18-24 months.
running supplied locks/retainers springs after checking.i use a purple 509 cam.
machined to 78cc chamber and pocket ported.
i also had to clearance for 3/8 smith brothers pushrods
i used cometic gaskets from Don Gould
work great daily driven and regularly raced on pump gas

Tex

i swapped from iron 906's-no worries.didn't find out till heads were on motor was in car grrr.
lots of masking off

Tex

I'm running Stealth heads on my 512. I changed the springs, etc., to match my solid roller cam. They were milled to bring my compression up, and gasket matched. Other than that they're OOTB. I've run a best of 10.51 @ 127 with them.

I would PM Chrisf regarding the Customer service and quality of the 440Source stuff. Chris is a straight up guy and won't steer you wrong.

Sheldon

Got a set on my 440.Had 3 shops look them over,no problems.I changed springs,locks and retainers,no problems with them at all. Did have to clearance for pushrods.

im liking these replies! mid 10s 127 are talkin my language! whats up with the headgasket thing.. source told me they recommend felpro XXXX gasket i dont remember which but it came out to 37thou which would be ok for me.

as far as the 3/8th pushrod clearance is there much meat that needed to be removed? i wonder if i could do that clearancing before i even put them on?

I run them all last season (approx 300 passes). 440 +.030, 13.5:1 Ross pistons, Mopar Performance .590 solid cam, forged crank, Ohio Crankshaft H beam rods, ARP 2000 bolts, 2" Hooker super comp headers, Weiand Team G intake, 1050 dominater carb, Turbo Action "J" converter, 4.56 dana in a 3200 lb E body. 10.38/126.6 in 1/4 mile, 6.56/103 in 1/8.
Like everyone else, I had to clearance for push rods, change springs, retainers and locks. I also had to make a small amount of clearance in the combustion chamber to clear the piston dome around the spark plugs.
Over all, I'm pleased. The best part is the light weight.
Brian Dunnigan

The advantage of the Stealth Head is:
#1. looks almost like a stock Head.
#2. Stock spark plug location will clear manifolds and headers designed for stock heads.
#3. Flow better than stock
#4. hardened Exhaust seats, No problem running Unleaded fuel.
#5. A lot lighter than stock.
#6. Affordable, not much more cost than rebuilding stock heads.

Disadvantages:
#1. Not made in the USA.
#2. Out of the box flow slightly less than the Edelbrock RPM.
#3. May need pushrod clearancing.

Unknowns:
#1. Customer service? I have not had any problems, but I have not tried to return anything.
#2. Quality issues? Some have posted on here about quality issues. I have no way to verify their issues. The heads that I have checked out fine, and I know several others who have had no problems with them either, but we have not torn down the engine to re-inspect the heads.

With the Stealth or Edelbrock heads you need to buy a head bolt kit that has the reduced wrench size bolts. The Angled spark plugs of the Edelbrock heads should provide a better plug location in the chamber for performance, but it can cause fitment issues with some headers and exhaust manifolds.
If you are going to run a solid cam, or really agressive hydraulic cam you will need to change out the springs/retainers/locks on either cylinder head. The stealth springs/retainer/locks should handle the same cams that the edelbrock heads do.

If you are looking for a performance head, and don't care what it looks like, you may be better off starting with the Victor, or Indy heads, rather then spending $1,000+ on the Stealth/RPM type heads then spending another $1,000+ to have them ported.

This old thread i posted some photos of when i got my stealth heads in Jan 2009:

https://board.moparts.org/ubbthreads/show...part=1&vc=1