440 Source Head Opinions?
- Thread starter Troub
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1968rt
Well-Known Member
- Joined
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Would be a big improvement over 516. Take a look at some Mopar flow #s. Stan Weiss' - Cylinder Head Flow Data at 28 Inches of Water -- DFW / FLW Flow Files for use with Engine Simulation Software were talking about 40 cfm at .500 lift
You sure can’t beat the price in today’s market. Are there better, racier heads??? Heck ya, but I would never spend a cent on stock heads for a build like you are doing. Upgraded heads with some room to grow.
Troub
67 Dart 270, 225 slant six
Yeah, unless I read it wrong, edelbrock heads are running close to $1000 each!
PRH
Well-Known Member
Very hard to compete with Stealths for the price........for the mild hot rod type build.
Depending on what the machine shop costs are like in your area, and the condition of the OP’s 516’s....... it’s pretty easy to spend over $1k refurbishing the stock heads.
Real world flow numbers for an ootb Stealth are about 260/[email protected] lift.
Depending on what the machine shop costs are like in your area, and the condition of the OP’s 516’s....... it’s pretty easy to spend over $1k refurbishing the stock heads.
Real world flow numbers for an ootb Stealth are about 260/[email protected] lift.
I haven't checked lately, but the Promaxx were about equally priced and the E-streets just a tad more than both at last I checked
pishta
I know I'm right....
Any AL is better than 50 year old cast for improvements. Do your homework and check your **** when you get it.
PRH
Well-Known Member
I just checked the Promaxx site.
For the BB Mopar assembled head, they only show it available as either bare or assembled with HR springs.
The flow data “tab” wasn’t working either.
For the BB Mopar assembled head, they only show it available as either bare or assembled with HR springs.
The flow data “tab” wasn’t working either.
Price has jumped about 200 bucks! Jegs has them
ProMaxx Performance 9440: 440 MAXX Aluminum Cylinder Heads Big Block Chrysler (B/RB) - JEGS High Performance
Flow chart worked for me
MAXX 210 BB MOPAR (Sold in Pairs) - PROMAXX Performance Products
MAXX 210 BB MOPAR (Sold in Pairs) - PROMAXX Performance Products
PRH
Well-Known Member
Huh.
Add that to the growing list of stuff that doesn’t seem to work on my phone anymore.
Add that to the growing list of stuff that doesn’t seem to work on my phone anymore.
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cookietruck
Well-Known Member
Jegs shows them to ship in roughly two weeks "pending manufacturer availability". I'd call Promaxx and ask if they have castings in stock. I'd be surprised if they do..
Edorion
Well-Known Member
440 Source has TF 240 heads in stock, they are more expensive but a much better head. I ordered 2 and they we delivered in 2 days.
Troub
67 Dart 270, 225 slant six
Got the 383 pulled out of the 65 Newport today. Fun time but darn cold here in the Florida Panhandle! Will see what else it needs besides new heads. The 67 Darts new heartbeat!
Troub
67 Dart 270, 225 slant six
Whatcha putting those on Edorion?
mcodecuda
Senior Member
You will need to notch the cylinder bores if you use any of the aftermarket heads on a 383.
The Trick flow, Edelbrock, Speed master and 440 source heads do not need notching on the 383.
Are the Stealth heads good to go out of the box, or do they usually need some porting/smoothing? From what I understand, TF heads don't usually need anything straight from the box, but what about the Stealths?
Troub
67 Dart 270, 225 slant six
440 Source states that the Stealths are straight up bolt-on.
Daves69
Well-Known Member
Some info here that may help your decision...........
Cylinder Head Frequently Asked Questions from 440 Source
PRH
Well-Known Member
It’s pretty rare that a new head assembly, as built by the manufacturer(as opposed to being assembled with unknown parts from an on-line retailer) would have “problems” serious enough to cause a potential failure.
That’s not to say that things are always roses and unicorns though.
Here is a valve out of a Stealth head with maybe a hundred or so miles on it.
This wasn’t causing a problem...... and maybe never would have.
But that’s not the same thing as saying it’s “right”.
The shiny line is the point of contact with the seat.
That’s not to say that things are always roses and unicorns though.
Here is a valve out of a Stealth head with maybe a hundred or so miles on it.
This wasn’t causing a problem...... and maybe never would have.
But that’s not the same thing as saying it’s “right”.
The shiny line is the point of contact with the seat.
threewood
Well-Known Member
Happy with mine. Put them on a 440 street build. I replaced springs,, keepers, locks. I don't know about out of the box, but cnc ported are nice. My spec sheet after work.
Finish was nice right out of the box.
Finish was nice right out of the box.
ultimatejay
Well-Known Member
440 source is cheap China made crap! Stop buying and supporting China, guys
All you whollier then us guys do you have a built engine in your car or are you a buff n shine car show guy. Reason I ask is what rods and crank are you running??? Who made the toothbrush you hopefully brush your teeth with? How about your oven, blender, microwave, car mats, lawnmower, rake, etc. come-on tell us.
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