440Source offering CNC Machined Heads

[Musicman]

Forgive me if I am late for dinner again, but I just noticed that 440Source is now offering CNC Machined Heads on their site. Flow numbers have been posted as follows...

CNC Stealth Cylinder Heads
Flowed at 28" on a 4.380" bore with a Superflow 600 bench.
Exhaust flowed with 2" tube.

Valve Lift:   Intake CFM:   Exhaust CFM:
.100"         75.0             72.9
.200"         156.7           124.8
.300"         219.8           166.4
.400"         266.2           198.1
.500"         298.8           219.3
.550"         306.2           228.6
.600"         314.9           233.3
.650"         320.7           238.2
.700"         320.7           243.8
.750"         321.6           248.2

No price given however, it just says to call for price and availability.

http://440source.com/cncheads.htm

[Blakcharger440]

Forgive me if I am late for dinner again, but I just noticed that 440Source is now offering CNC Machined Heads on their site. Flow numbers have been posted as follows...

CNC Stealth Cylinder Heads
Flowed at 28" on a 4.380" bore with a Superflow 600 bench.
Exhaust flowed with 2" tube.

Valve Lift:   Intake CFM:   Exhaust CFM:
.100"         75.0             72.9
.200"         156.7           124.8
.300"         219.8           166.4
.400"         266.2           198.1
.500"         298.8           219.3
.550"         306.2           228.6
.600"         314.9           233.3
.650"         320.7           238.2
.700"         320.7           243.8
.750"         321.6           248.2

No price given however, it just says to call for price and availability.

http://440source.com/cncheads.htm

Looks like I will be getting a second set.   

[oldkimmer]

........................1,999.99........................max port cc=255...........do u know the indy ez port size is 270 unported + approx the same $....I got that from a very reliable source...........as well the aluminum in the stealths seems to b too soft and they r prone to pushing out head gaskets..............kim.........

[Musicman]

I don't know the cost of the CNC ported Stealth heads, but numerous tests have shown that an INDY EZ head right out of the box at $1,885, only flows marginally better than a stock Stealth or Eddy head. In other words, the CNC ported Stealth or Eddy head will flow better than the OOTB Indy EZ at $1900. If you buy the INDY EZ heads CNC ported they will of course flow better than the CNC ported Stealth or Eddy heads, but at a cost of $2,935.

[mally69]

Getting interesting   

[tan top]

 

         like to here more on these head gasket problems              

[Musicman]

Chamber diameters vary quite a bit with these heads (and others), so it's something you have to look at. Shown below are 2 images illustrating the head gasket fit on 2 different sets of heads... In each case the same recommended gasket was used.

[tan top]

Chamber diameters vary quite a bit with these heads (and others), so it's something you have to look at. Shown below are 2 images illustrating the head gasket fit on 2 different sets of heads... In each case the same recommended gasket was used.

 
  thanks for the pictures /info Mike 
  yeah i see what your saying     ..... ...  would of though with modern casting technology they could of  fixed this  problem ... .. ....... maybe custom head gaskets  need to be made for this heads   

[Musicman]

Well, there's plenty of different size head gaskets out there, but usually the lager bore gaskets are race defined and fairly expensive, so your better off with a set of heads that actually fit the recommended gasket. If they don't, contact the manufacture and have them fix the problem.

I agree however, that with today's processes, these sort issues should not exist... but they still do non-the-less... and 440Source is not alone in this category.