• 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Question for a machinist
#1
Just thinking and wondering, would it be possible to take a 2V Aussie closed chamber head and mill/port it to match the dimensions of a 4V head?

I realize it would probably be cost prohibitive, but is it otherwise possible?

[Image: 1_01_07_15_8_53_18.png]

"I love my Hookers!" and "Get some Strange" probably have a different connotation to non automotive enthusiasts!
  Reply
#2
I think you run out of material.

'Mike'
73 Convertible - 351C/4V CC heads/4bolt/forged flat tops/comp 270/rhodes/mallory unilite/tri-power/hookers/glasspacks/c6/3.50 limited slip/Gear Vendors/Global West sub frames, strut rods and shelby style traction bars/ Rear sway bar/tilt steering (not original)

Pics of modifications included in:
  Reply
#3
Good question! Would drive some machinist crazy when you tell them to do a match port job.

[Image: 2rr7aiv.png]

Just cruising along minding our own business when BAM!!! The LAWS show up.
  Reply
#4
or maybe write a cnc program using some type of scanning of a 4V head, overlayed on the actual 2V casting and then machining to match

[Image: 1_01_07_15_8_53_18.png]

"I love my Hookers!" and "Get some Strange" probably have a different connotation to non automotive enthusiasts!
  Reply
#5
I think you would hit water and strike oil. The water jackets are very close on the intake port short side radius. The top of the intake port would likely break out into the rocker area. On the exhaust side the 4v ports would break out the top of the port bosses.

Jeff T.

Low buck, touring style, '73 Convertible "rolling restoration", 351c, 2v heads with a shave and a haircut, Performer intake, Holley 650(ish), roller rockers, screw in studs, guideplates, stainless valves, Duraspark / Motorsports MSD, T-5 conversion. 1-1/8" front, 3/4" rear swaybars KYB shocks and some home brewed subframe connectors. Future plans; JGC steering box, Cobra brakes and... paint, interior, etc.

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passenger.

[Image: 1_12_09_14_10_15_11.png]
  Reply
#6
Jeff73Mach1;82609 Wrote:Just thinking and wondering, would it be possible to take a 2V Aussie closed chamber head and mill/port it to match the dimensions of a 4V head?

I realize it would probably be cost prohibitive, but is it otherwise possible?

You can just buy a set of M code closed chamber heads.
  Reply
#7
Basically NO, not enough metal/meat to open them up that much, But a well ported set of 2V heads with a 4V exhaust valve, will make some good power - 400-450hp with the right set up,
enought to break a 4 pinion LSD 9' inch third member
ask me how I know..
  Reply
#8
I don't think you want to. I have 4v's and 2v's and love them both but bottom line the 2v is the better head below 5000 rpm for street use.
My Edelbrock Torker for the 4v heads is MUCH smaller than the 4V port. There is a freakish difference. It's meant to be this way due to the huge 4V ports. I would love to stick the 4V torker on my 2v motor!
A local shop uses 4V heads, and a Yates intake gasket that is in between the 2v and 4v size and fills the port with epoxy and makes the ports smaller, and more efficient. They also use a flow bench to make sure it is done properly and flows equally and flows well.
Look @ the port plates made by MPG , they make that 4v port smaller and more efficient .I would stick with the Aussie head as is and look for gains in the Intake exhaust and camshaft design.
My 4V motor is on a drag car that see's a max rpm of 7000.Big 3200 conveter and 5.14 gears too.
  Reply
#9
I've already got 4V Closed chamber heads. It was a question I had, not a plan per se. I did not know that the water jackets and oil passages were different between the two castings.

[Image: 1_01_07_15_8_53_18.png]

"I love my Hookers!" and "Get some Strange" probably have a different connotation to non automotive enthusiasts!
  Reply
#10
Joe Stang;82751 Wrote:I don't think you want to. I have 4v's and 2v's and love them both but bottom line the 2v is the better head below 5000 rpm for street use.
My Edelbrock Torker for the 4v heads is MUCH smaller than the 4V port. There is a freakish difference. It's meant to be this way due to the huge 4V ports. I would love to stick the 4V torker on my 2v motor!
A local shop uses 4V heads, and a Yates intake gasket that is in between the 2v and 4v size and fills the port with epoxy and makes the ports smaller, and more efficient. They also use a flow bench to make sure it is done properly and flows equally and flows well.
Look @ the port plates made by MPG , they make that 4v port smaller and more efficient .I would stick with the Aussie head as is and look for gains in the Intake exhaust and camshaft design.
My 4V motor is on a drag car that see's a max rpm of 7000.Big 3200 conveter and 5.14 gears too.

My friend fills the intake and exhaust ports as well for better flow characteristics on the race engines that require stock castings. Some do not want to hear the 4V head/port is not perfect though. Big Grin

Jeff T.

Low buck, touring style, '73 Convertible "rolling restoration", 351c, 2v heads with a shave and a haircut, Performer intake, Holley 650(ish), roller rockers, screw in studs, guideplates, stainless valves, Duraspark / Motorsports MSD, T-5 conversion. 1-1/8" front, 3/4" rear swaybars KYB shocks and some home brewed subframe connectors. Future plans; JGC steering box, Cobra brakes and... paint, interior, etc.

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passenger.

[Image: 1_12_09_14_10_15_11.png]
  Reply
Share Thread:  


Possibly Related Threads...
Thread Author Replies Views Last Post
  Toploader question Jeff73Mach1 16 446 10-11-2018, 12:24 PM
Last Post: Jeff73Mach1
  Motor mount vs Frame mount question crzyfun 8 441 09-15-2018, 12:31 PM
Last Post: Don C
  Last ram air question i promise eventhorizon 9 1,113 07-21-2018, 10:28 AM
Last Post: Carolina_Mountain_Mustangs
  T-5 trans question vintageman 3 381 07-14-2018, 01:41 PM
Last Post: 73pony
  Distributor Question 73pony 8 489 06-12-2018, 12:55 AM
Last Post: OzCoupe72
  351C Stroker / TKO 600 bellhousing question tony-muscle 11 1,913 03-29-2018, 03:18 PM
Last Post: tony-muscle
  FMX Transmission casting number question? Monterey 6 1,132 03-01-2018, 11:45 AM
Last Post: Vicus
  ok probably dumb question but...... libram 8 851 01-09-2018, 10:41 PM
Last Post: rotorr22



Users browsing this thread: 1 Guest(s)