Australian 250 2V Head back from Machine Shop

falconcritter

Well-known member
Supporter 2023
Supporter 2021
Supporter 2018
Here is my head back from the Machine Shop ! Thank You Rocklord !!!!!!



 
Looking good, did you stay with the 11/32" valves or did you go with oversize 5/16" ???
What are you going to put it on??
 
I kept the 11/32 . I am putting it on a 66 200 block with 141 Ford 4 cyl flat top pistons !
 
Thnx,
esp 4 da pic!!!
How bout carb, ign, exh., ect?
 
60 cc nominal. +/- about 2 cc's with a slightly cresent/hesrt shape which is where the 8cc increase comes from the earlier 52 cc C9 heads. Aussie Fords always used 25 thou deck to piston clearances, and thecomoression was quite high.


Ford US decided the US 250 would be a torque monster so they added a 103 to 120 thou deck clearance to tumble the compression while using the 200 6.5 cc pistons, 27 thou gasket and approx 60 cc large hole version of the C9 head.

Even the 69 Grande 250 had IIRC, a 2.47 ratio econo axle ratio option..


The Aussies used the US 256 duration hydraulic cam in everyting I6 and V8 from 1965 to 1984.So the Aussies used the US 302 2-bbl carb tune in its 250 2V. The Aussie 302 2v and 2502v used the same carb jetting, made the same 16.9 secound quarter mile, had the same compression ratio, yet were rated 60 to 70 hp gross differently; 170 hp for the 2v 250, 230 or 240 hp for the 302 Cleveland 2V with US Dodge 318/361 style Stromberg WW 2bbl carb. When the much stronger 207 and 188 hp net 4bbl Thermoquad was added in 1977 to 1982 Ford 4.9 Clevelands, nothing went much faster than the 71 to 74 2V 250 sixes.

The 2V 250 is the exact match if the 1982-1984 Cross Flow Port EFi Falcon 4.1 engine, with that mysterious 16.9 second quarter mile with 4 speed single rail, and the4800 rpm red line returning after a 9 year highpierformance 250 six absence.

Apparently due to kickdown rod issues and the arrival of US Cleveland engine tooling, the auto 250 2V versions werent made, but the later auto C4 302C 2V 230 hp version with single exhaust in a heavy 3550 pound station wagon wouldnt do a 17.8 second 1/4 mile., so just like US 302's, a V8 was clearly doctored to suit what ever car it was up against. However, in a V8, weight , exhaust, air cleaners, compression ratio drops, and heavy duty axles and other power sapping auto embelishments like power steering and air con are the real killers, a good 2300 pound fiberglass Bowell 302 2V would do15 second quartets with the 240 hp dual exhast engine and a four speed single rail.Some New South Wales 4.9 4bbl 188 hp engines couldnt do 18.7 second quarters yet that funny 16.9 second flat quarter mile was the standard fare of every privately tested 4.9 C4 auto from 79 to 82 .

The M code 250 2V had headers, the standard 256 degree cam, and really was a US 302 4bbl level performer.

On any 200 US engine, a 2V head with headers becomes a very strong 8.3:1 compression ratio engine with the stock 58(auto matic) to 65 hp (manual) rear wheel hp is raised to 85 to 100 hp. kstang and slades video of his stock ss a rock 200 with just a 2v 250 head and auto showed its combined breathing, header and 2-bbl carb intake sizing was an instant solid gold hp improver without any torque loss.


The real 250 2V gains were all that disributor, carb and then the cam related stuff...the US 200 has better exhaust flow and the US guyswith the first 68 or so head Mustangaroo found had been fitted made the 2V heads counted as of 2009 rang from kstangs 100 or so rwhp to other up to 200 hp plus rwhp versions. (Dougs 66 MustangGeezer, and marley...Although contraversial due to the dyno run detail, there is little doubt a 264 cammed 2V 250 head can make a 200 1v the equal of the best direct mount 200 (crosleys), and the best triple Offy engines(kevinl058 and falconsedan deliveries 250 tripower 66 Mustang)
 
chad":1fzy076j said:
Thnx,
esp 4 da pic!!!
How bout carb, ign, exh., ect?

Well I do have these parts I have collected over the years ... Crower Cam 284 duration 480 lift , JP Performance double roller timing chain , 1966 200 C.U. Block with machine work done , Aussie Header ( That I got with my first 250 2V from AU )

Parts I need too get : Ford HSC 141 C.I. 4 cyl pistons , adapter plate for intake , Holley 350 two barrel , a custom dizzy from wsa111 , and a ghost 200 block for parts I am missing on mine .
 
falconcritter":3mqkerku said:
chad":3mqkerku said:
Thnx,
esp 4 da pic!!!
How bout carb, ign, exh., ect?

Well I do have these parts I have collected over the years ... Crower Cam 284 duration 480 lift , JP Performance double roller timing chain , 1966 200 C.U. Block with machine work done , Aussie Header ( That I got with my first 250 2V from AU )

Parts I need too get : Ford HSC 141 C.I. 4 cyl pistons , adapter plate for intake , Holley 350 two barrel , a custom dizzy from wsa111 , and a ghost 200 block for parts I am missing on mine .

What parts do you need off the block I have extra parts.
 
Oil sump pick up and bolts , oil pump bolts , oil slinger , oil pan bolts , cam thrust cover and bolts , lifters , timing cover bolts , timing gear bolt , I am sure I am missing more . It would be easier too get a 100.00 complete motor too get them .
 
Sounds like you have a good combo of parts collected should be a very decent performer. :unsure: I think if your going to be using the Double Roller Timing Chain Set then the stock oil slinger probally won't fit anyway, with the better seals we have now days it shouldn't be a problem. That Aussie 2V Head looks great! Good luck on your build. :nod:
 
falconcritter":1vsbm2fv said:
Oil sump pick up and bolts , oil pump bolts , oil slinger , oil pan bolts , cam thrust cover and bolts , lifters , timing cover bolts , timing gear bolt , I am sure I am missing more . It would be easier too get a 100.00 complete motor too get them .

I will see what all I have I should have most of it. You do not need the oil slinger. I am not running one with the double roller. Lifters and oil sump pick up you need to order new.
 
bubba22349":3scgq0jp said:
Sounds like you have a good combo of parts collected should be a very decent performer. :unsure: I think if your going to be using the Double Roller Timing Chain Set then the stock oil slinger probally won't fit anyway, with the better seals we have now days it shouldn't be a problem. That Aussie 2V Head looks great! Good luck on your build. :nod:
X3 on the slinger (y)
 
Any help is greatly appreciated ! Thank you 65-coupe ! Thanks for the words Bubba ! And I will deep-six the oil slinger !
 
Just my $0.02..... Whenever I take something apart, I go to the farm supply store and buy new bolts. It's cheap insurance
 
I can scratch the adapter plate off of my list of things I need ! Got a good price to boot . :D

100_2679.jpg


A LITTLE AT A TIME
 
what would happen if I sawed the log (plus/minus) offa my USA 250…would that intake go on easy?
The plate etc for the Oz x-flow head to my motor is just too much work, this idea way less.
What am I missing (besides 1/2 a brain)?
 
Back
Top