Max wedge port on 915 heads?

[Mopar_Mike]

Is it possible to have a set of 67 915 heads opened up to max wedge port size intake and exhaust using 2.14 1.81 valves? If so, is it worth it money wise or buy new. Thank you.

 

[PurpleBeeper]

Buy new

 

[gkent]

There is NO stock (non-MW) iron head that's worth the money to "try" to port to max wedge size - period.

 

[oldkimmer]

If you’re paying someone to do it that’s a no go. Max wedge ports are smaller on aluminum heads and intakes so yes it is possible but I don’t advise it. Kim

 

[33 IMP]

To match genuine max ports? No.
To use those valve sizes? yes.
Are those actual vintage maxwedge size valves? No. (2.08/1.88)
Modern versions of max.port heads use bigger intake, smaller exhaust.cause it works better.
Will bigger valves help without at least some porting? Probably not
Will they be worth the ROI? Probably not.
Is porting on old cast iron expensive? Yes.

 

[RemCharger]

Someone, maybe a couple places, made up some decent cnc programs for stock heads.. that would likely be your most efficient route.
If you had to have stock heads.
But if not, there is every level of aluminum choice out there.

 

[33 IMP]

If your 915s are serviceable as is, I'd use em. If they need guides, valves, and springs, I wouldn't spend a penny on em.

 

[RemCharger]

Not sure what all is out there but here's an example
Mopar 906 Cylinder Head Improvements - Mopar Muscle Magazine Mopar 906 Cylinder Head Improvements - Making The Most Of 906 Heads

 

[33 IMP]

There is a company in the mid west (Indiana? Illinois?) that has a cnc program for a 915/906 that is supposed to be pretty good. I'm drawing a blank on the name. K-something.
I'm glad there is such a thing, but the only practical use I see is for a F.a.s.t. type car that needs all the performance it can get out of iron heads. The cnc isn't legal for stock eliminator.
I would certainly put the money to cnc a 915 toward a good set of aftermarket aluminum heads instead, 100%.

 

[Mopar_Mike]

That pretty much sums it up.. lol.. Thanks all for the responses.

 

[stage3]

trickflow 270's ,do yourself a favor,, all new and way cheaper/better.

 

[bobs63wagon]

Is it possible to have a set of 67 915 heads opened up to max wedge port size intake and exhaust using 2.14 1.81 valves? If so, is it worth it money wise or buy new. Thank you.

Those valve sizes are from a Mopar Performance 518M head, not the stock 518 or 518M heads.

 

[68-500]

Yup not worth it. Box up them 915’s and send them to me I dispose of them properly.
Side note: I don’t see any benefit in spending good money on cheap Chinese heads. Choose wisely if you go aluminum.

 

[BSB67]

Is the goal max-wedge size port, or flow?

You can have them opened up to flow 300 cfm. They will have 2.19” intake valves. Still will not be max-wedge size. Price in the range of TF 240.

 

[Geoff 2]

The thinking has changed since the MW era. Bigger is not always better....

 

[Budnicks]

Engine Masters,
has some great info, std port head (video below)

they also have one on 'Measuring the Max Wedge'
where they compare the rest to the TF 270 isn't too big for the street even
proper style port, big is batter, wrong type port, yeah bigger isn't necessarily better

but;
Like Steve Bruele says, the BBM has a head fit for a like SBC port configurations, on a big block

the TF 270, it's about $1,000 more, with all the options,
then a Edelbrock RPM CNC Ported, std port, will flows about int. 230cc/330cfm
still to small even for a stout 383, still very street-able,
no loss in torque in the bottom end, meaning it's still to small of a port

BBC Rect. port heads are like 270cc, unported, cast iron GM heads
can easily be 350cfm when ported prof.
& the BBC 454 LS6 or LS7 off road engine lacked no bottom end torque either
the 396 with a 3.75 stroke 425hp
(or a 427 had the same bore & stroke as a 426 MW)
& they all had rect. port heads available
it didn't kill any bottom end, in them either, they made mor power/tq too

that too big of a port won't work isn't true, depends on the ports design
way too big of a port yes, even the TF 270, isn't too big even on a mild street engine
that BS is old wives tale, false info
don't buy that bullshit, get a good head, biggest port window off the shelf
an aluminum good head, cut to the chase

& not the cheap Chinese cast heads, if you really need to make HP/TQ,
they are good for about 20hp over stock, out of the box, compared to 906 cast iron
(yeah they are cheap, & lesser performance too, unless hogged out & still not as good)

have them good alum. heads CNC ported too, it's all money well spent

the biggest choke point of a BBM Wedge std port head configuration
is the cylinder heads 'smaller ports', more suited for a SB, in performance
even the Max Wedge Head is still small, but way better, but still too small
for max benefits
or making best power & torque

enjoy

 

[33 IMP]

Hypothetically:......
If you are trying to make your heads big enough to use a crossram, to make it look like a max. (any other reason makes no sense to me), and you haven't yet acquired the crossram, go to A&A, and get their version sized for 440 heads. Their 440 crossram is probably cheaper than a real max intake anyway.


If your just trying to increase the performance of your 915s....... porting old iron is a BAD idea, money and results wise, verses a good set of aftermarket aluminum heads.

 

[33 IMP]

I spent good money at IMM a few years back, getting a pair of iron beads freshened. New valves, springs, valve job and guide blueprinting (new bronze guides were already installed.)
Kicker is, they were professionally ported max wedge heads, and flow 100 cfm more than 915s
There is NO WAY, I would pay what I spent, on ordinary 915s

 

[PRHeads]

to answer the original question…….

I believe Dave at KG Engines(in Kansas Ohio) has a MW program for some of the non-MW heads.
I’m not sure if 915’s are on the list or not.

Give him a call.

A few years back I reworked a set of Stealths so they could be used with a factory MW intake.