broken-wheel

I got 247.16 with a 1.91 valve and run off the mill 3 angle job without touching the chamber of an unmarked head, 39mm cross section on the face of the runner so I guess that's a pretty good flowing head for a stock port size and valve size
can you talk about the seat or how the valve was cut ?

which is funny because the Jag used the same M90 blower and made the Berlina look pedestrian and weighted more than the Berlina ... keep in mind that both the holden and ford camp protected the V8's as much as they could from their 6 cyl counter parts

tune it first  then if you're not happy go further

tune it first  then if you're not happy go further

isn't the M90 a little on the small side for 4L ? I thought the M112 would be a better choice but M90's are cheap and plenty which is probably why I just answered my own question, they're a little on the small side but good availability and much cheapness 

isn't the M90 a little on the small side for 4L ? I thought the M112 would be a better choice but M90's are cheap and plenty which is probably why I just answered my own question, they're a little on the small side but good availability and much cheapness 

agreed, he also likes to keep some things for himself and sometimes talks about high level stuff as if anyone can understand him (Vizard) but the man knows quite a bit, I remember the camshaft challenge where he picked the lift, duration, ramp rate just by looking at the engine bore/stroke and head flow/configuration and was within a few HP of what a professional camshaft engineer got! He's a bit of a grimy old man but worth paying some money to read his ramblings
I only got burned by backyard head specialists once to the tune of $400 and never again! that $400 extra for porting did absolutely noting but slightly port match the intake to the head, there were no burr marks then the head porter said "if you want proper porting mate it's from 5k upwards" I walked away, bought a book and a dremel tool, used blue die and a vacuum cleaning sucking ballbearings through the port to see it takes the die off to better understand flow.
I say this again ..... you can easily make the crossflow head to flow way past 450HP and it will be quiet BUT in order to make 430HP out of it so you can utilise the head flow you will have to spin it past the point where the piston speed is dangerous. Nobody wants to go 5000 Ft/min on piston speed because when it blows up they will come on the forums and blame the builder blah blah 
I like the crossflow engines and imho once you get over 350HP shit will break and will cost a bomb to make it live. At a quarter of the price you can go Barra forced fed never look back. There is no way you're going to build a crossflow for under 10k which will run 11's and last a season which is about 50 passes. And if you do build one that lasts 50 passes (road km's mean nothing here) and run's 11 then you'd run 9's with a Turbo Barra on the same money.
I for one don't like to even entertain the idea of getting anyone to do "performance" work on something that is not feasible from an engineering perspective but hey you can dig a hole with an escalator or you can dig a hole with a toothpick. Whatever floats you boat
Matt, that remark wasn't launched at you

PLR do ok work and so does Jack Brothers, actually I'm yet to find someone better than Jack Brothers in Brisbane, maybe mendham engineering but they are expensive.
If you need to send parts half way across the country to get it machined properly do it! machining is 90% of reliability 

oil pressure sensor is right at the back so you know if the PSI per 1k rpm is not enough .... but never seen issues with oiling in crossflows

normally you would run a drill through the oil gallery all he way to the back of it, most machine shops have this stupid long drill bit thing, they do it when they do a line bore this will ensure the oil gallery is the same size from front to back but I guess he is old school and you NEVER want to argue with grumpy old men or tell them EFI or programable ignition is better 
 
build seems to be coming along nicely! what guide plates did you end up using? cut down clevo ones?

Radius rod bushes I would go spherical bearing! they make a huge improvement in handling an feel. You really have to try a really hard bush in the radius rods, makes no difference to comfort at all

cheapest one as you'll put new rods/piston and valves, if you do buy a "genuine turbo motor" you'll pay more than you'd pay for a forged self built bottom end motor with good valves and springs etc
you can paint the rocker cover any color you want but it's insane the price they ask for a turbo motor ... 

The Barra is king! No shit, anyone who tells you they can get more power out of ANY 6cyl engine for a dollar figure is dreaming or never looked at the Barra engine. Ford learned almost 40 years on how to make the damn thing bulletproof and with a few thousands you can get a taxi $300 engine to take 1000 hp.
The crossflow will sound nicer thou and you'll see, it will be cranky and more characterful than the Barra but won't be as reliable or powerful. Crossflows with big cams are like hookers....

agreed, he also likes to keep some things for himself and sometimes talks about high level stuff as if anyone can understand him (Vizard) but the man knows quite a bit, I remember the camshaft challenge where he picked the lift, duration, ramp rate just by looking at the engine bore/stroke and head flow/configuration and was within a few HP of what a professional camshaft engineer got! He's a bit of a grimy old man but worth paying some money to read his ramblings
I only got burned by backyard head specialists once to the tune of $400 and never again! that $400 extra for porting did absolutely noting but slightly port match the intake to the head, there were no burr marks then the head porter said "if you want proper porting mate it's from 5k upwards" I walked away, bought a book and a dremel tool, used blue die and a vacuum cleaning sucking ballbearings through the port to see it takes the die off to better understand flow.
I say this again ..... you can easily make the crossflow head to flow way past 450HP and it will be quiet BUT in order to make 430HP out of it so you can utilise the head flow you will have to spin it past the point where the piston speed is dangerous. Nobody wants to go 5000 Ft/min on piston speed because when it blows up they will come on the forums and blame the builder blah blah 
I like the crossflow engines and imho once you get over 350HP shit will break and will cost a bomb to make it live. At a quarter of the price you can go Barra forced fed never look back. There is no way you're going to build a crossflow for under 10k which will run 11's and last a season which is about 50 passes. And if you do build one that lasts 50 passes (road km's mean nothing here) and run's 11 then you'd run 9's with a Turbo Barra on the same money.
I for one don't like to even entertain the idea of getting anyone to do "performance" work on something that is not feasible from an engineering perspective but hey you can dig a hole with an escalator or you can dig a hole with a toothpick. Whatever floats you boat
Matt, that remark wasn't launched at you

should be on Alibaba by tomorrow

should be on Alibaba by tomorrow

should be on Alibaba by tomorrow

yup 3" off the shelf HM55, cut it right after the last weld and weld in a cone to 3", 850cm from the cone bolt a 3" hooker and a tail pipe job done, anything more will cost a truckload of money for very little more power
make sure they don't weld the tail pipe to the muffler and that they keep the muffler located if you decide to unbolt the tail pipe so you can easily unbolt it and bold in a short 30degree elbow if the track allows you, the sound alone is worth it

Same same!
Here is mine, pulled it out of storage after about 13 months ... first start don't mind the bottom end knock, she'll be right
 

never taken an unregistered car there but I might have to use a trailer as this thing only has 1 or 2 runs left before it's big end lets go
my guess is if it passes scrpteneering it's gold

Nice! you got the MoTeC system exhaust?

Same same!
Here is mine, pulled it out of storage after about 13 months ... first start don't mind the bottom end knock, she'll be right
 

when it comes to valve train this are my go to parts and i have never had any fail
Rockers: Comp 1830-16, Lifters: Isky SO382-H or Crower cool face
both items are bulletproof and have never seen them fail, both are steel and not the lightest around but they will serve you well, I never liked alloy rockers with flat tappets or solid roller 

yup but you can listen to others and go through belts and flywheels like crazy, on a manual i'd aim for 10thou

yeah less than .5mm