2V head not same on exhaust???

[Anonymous]

Got my 250 2V head back on the other day with extensive porting and polising of exhaust ports. with the addition of the new 500 holley (instead of 350 holley).
I went against conventional wisdom and enlarged the hole in the inlet manifold where the carb sits and removed the ventury slope off the base plate so it goes almost straight down all the way from the carb
Took it for a test drive and noticed BIG inprovement in overall performance.
The shame about all this is that my extractors (actually a lot bigger than another pair I had) are too small for the newly enlarged ports. I had to use a power file and bevel back the head plate openings to 45 degress and about 7mm in some places.
Does anyone know for sure if 2V extractors are different from the standard integral head. Some of the worst problems I encountered were on the two centre siamese ports. These two centre exhaust ports seem to be in a different possition compared to the standard head which also has a grated section on top that the 2V doesnt have. Its also interesting that some exhaust gaskets made for the standard head will not fit a 2V without shrouding problems on these centre ports.
I dont really want to go to the expence of getting some custom made. Does anyone know of extrators that are 2V specific. Im not sure just how much this will effect the perfomance, but I imagine it would be significant and perhaps others with 2Vs may be unaware that a similar problem exists even without enlarged ports (was in my case before porting).
Ive read literature that says when porting in most cases you are very unlikely to encounter this sort of problem (ie,smaller on extractors). Ha.
An original article on the 2V I have says that the exhaust ports on a 2V were cleaned up at factory? I wonder what they mean by "cleaned up".

 

[xctasy]

Ford has a habit of going "gorilla balls" with head modifications. Like 4V heads which have almost twice the port area as the stock 302 Windsor heads.

The US guys are best to talk to over your extractors. A port mistmatch to stop gas going back into the engine is best. Die grinding is your best option. Do a search on "exhast port dividers". The Aussie head wasn't exactly the same as the US single venturi head. I'm certain someone , maybee AZCoupe, spoke on this a while back.

These guys are right on their game...using good old Aussie bits

 

[Anonymous]

Execute
Thanks for reply. how did you learn so much about all this stuff.
Oh I know you the old Tassie devil Avatar. But he was just a tad too aggressive for my liking. And some one named the poor animal a Devil.
I want people to reply to my posts.
Cheers Tim

 

[xctasy]

I got into cars because there were no hot girls in my home town, no older brother to get me drunk, and I was such a ratbag at primary school that the teachers and my folks almost had a nervous breakdown. Fires, vandalism, theft...So they bought me car mags to keep me quiet. Worked a treat. I'm just into cars, man.

My 1st avatar was this

I then considered this, but to , so I didn't use it.

Then I got this

now I have this

Whatever turns you on.

Back to the exhast. Headers is what the USA crew call 'em. They will help out with your hi-flow exhast..eventually!

 

[Anonymous]

huhu. Did they get you Flintstones comics too?

 

[xctasy]

No, they named me after the Dinosaur....

 

[addo]

No, they named me after the Dinosaur....

Destructosaurus Terra Dunedinii!

Seriously Tim, that is complete crap about the 2V exhausts being modded at the factory. If anything, I have found them 1/2 mm smaller than the log heads.

What brand of gasket did you use, and what port size (dimensions) finish? Ford made its own 2V extractors but I believe they are all LONG gone. They were to fit Cortys or Falcs; different codes. Talk to Ian (? I think) at Pacemaker with your sizes.

Adam.

 

[Anonymous]

Maybe complete crap. If that is the case then both mine and my mates Aussie 250 2V heads are one out of the box because we have both had the same problem.
Recently when I took the 2V head off I actually bought a log head from the wreckers so that I could do comparisons and measurements with them side by side by holding the 2V match ported gasket on both heads to get the precise difference. There was a mile of difference especially on the too centre ports. The whole port was nearly 7-8mm further down on the 2V head. The extractors also bore this out. Sure they bolted straight up but the fouling problem I must have unknowingly had before must have been terrible.
My mate bought a "250 log head gasket" for a 250 2V recently and had to go to the trouble and expence of fitting another 2V one which the installers ussured him was quite different. I realise there maybe a variation in US and Aussie heads.
Lesson? whatever anyone says check em first to make sure before bolting them up.
Maybe this is Fords Quality control but I doupt it.

 

[Anonymous]

Mistake 7 to 8mm further up on 2V compared to log head sorry I got a bit carried away

 

[addo]

Tim, your ports are/were most likely "out of the box" because most peoples' ideas of "fully worked" mean a used Holley 350 and some chrome bits. ACL sell a 2V gasket set which is bearable on the exhausts (about 1.5mm tolerance), but ordinary on the inlets. Did you match-port the inlet fanimold?

I've taken a good few pics of log and 2V quirks. Sometimes the oddities excite me more than the parts themselves.

Adam.

 

[Anonymous]

No I left the inlet as it was, as I had heard most benefit comes from porting the exhaust on a 2V. It only cost me $200 to take 1.5 to 2.0 mm all the way along the runners. I did the polishing mostly by hand, come up really well. Should I match port the inlet sometime, as well?