Outback Jack

Gerg is right, Vizard is a head working legend.
When you get right into his head work you realize HOW smart he is.
He was into 2L pinto motors in the 70's.

It's not all about just grinding stuff out, any dill with a die grinder can go that... And muff it up.

It's about the approach angle of air and velocity at the back of the valve.
Sometimes metal or resin is added to the port to change the approach angle of the air.
Then you want to go further its valve relocation. That's how it's done properly.

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David Vizard has been a prominent author of performance books since the 70s and is a successful race engine builder and performance guru. He's been around since before aftermarket parts were a thing so knows how to squeeze every last bit of performance out of factory parts while at minimal cost.

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True. I've watched a few of his vids. I'm guessing that Mitch is a new builder, and not keen to start drilling out a head. 😁

Vizard did an episode on valve shrouding and it's interesting to see his view on it. He takes the bare minimum to achieve the results and no more. It's all in where you remove metal and not how much

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The castings from 1970 were average at best, if you stick a standard inlet gasket onto a small port Clevo head you'll see what I mean. I'm not talking full port and polish, just match the inlet port, to the manifold, exhaust port to the extractors, using a store bought gasket. It's not hard work, just a lick with a die grinder, its free HP...
 
Unshrouding the valves is great if you know how, but, not for the beginner. The hours involved in getting all 8 ports to flow similar, and the added weight of cast iron, just cheaper to buy an aftermarket head. They weren't around 25 years ago, so keen builders did what they could. Nowadays you can grab some AFD, CHI, or SCM heads. 

Going good me Ol Chestnut!
Looks like someone got 400 fever...
He he.

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With bordem set in I got my build stuff out for another check and wd40 ect rods,heads,bell,manifold and will post pictures of the block next

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i just cleaned up the garage and got some of my build stuff out for a quick ok and re bag back up,also the other 400 is sold and just waiting pick up.

As much as I hate to admit my association with this lol  But it sure was a learning curve back then .. But all relevant to this conversation here .
 
This was the same block prior to turbo's. Again factory clevo block , lots of nitrous 
 
World's Fastest Cleveland Powered Ford Cortina Streetcar by RDP Motorsport USA - YouTube

We did it years ago     The old RDP ute , Factory clevo block from the wreckers ,  C302B heads , 2 x 88mm Turbos  1273 RWHP . It went on to run 8.50 
That factory block never let us down . And i can verify it was every bit a factory clevo block..  Was grouted to welch plugs . The only thing in the block was some fretting of the main caps @ 8200 rpm  
 
That same day I got to take  that car ontrack for powercruise . It was fast  
 
1273rwhp Ford BA Xr8 Ute by RDP Motorsport USA - YouTube
 
Ford Ba XR8 Twin Turbo Ute at the Drags Testing Built by RDP Motorsport - YouTube
 
Twin Turbo Ford XR8 Ute by RDP Motorsport - YouTube

just about everybody here on the gold coast is in the tourism trade,its 28 deg here atm and just had that mega storm go thru ,also buying a fridge today just as a spare 2nd hand one,she said just put it in the garage,before i bought it i made sure a borg warner centre would fit in the freezer to shrink it a few thou cause dont have a spreader.

yeah keep the cnts away😂

my oil filter thing came from the usa ,says suits 335 series and big block ,this is going on my 400 ,couldnt find any company here that does them ,also has a big allen key hex to screw it in,im also back at work ,i got my old job back i started on monday and things are looking up,now i can think about a roller cam and spend a bit more where it is needed.

Yeah, I watch Richard Holdener every now and then. Like the way he documents everything. 
 
Agreed, it's a struggle to see what is "Factory" anymore, But a Windsor with Clevo heads is still an awesome thing to behold. 😁

Even in trans-am racing, with a 5 litre size limit, the Chev DZ 302 vs Boss 302 (ie: apples for apples), the Ford had a 20hp advantage in race trim. Holdener built factory-correct test motors of each and the Ford made more power with much less cam.

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That pretty much goes for any build on an engine more than 30 years old though Bear, they simply weren't made with the metallurgy, and the aid of cad and stress test modelling like they are now.

I don't know where one should draw the line as to when an engine design is no longer considered original... What would you call a factory 351W block with CHI heads, Eagle crank and rods, forged pistons, roller cam conversion, tunnel ram manifold, dry-sumped, serpentine belt drive... Is it a Clevor? It doesn't have actual Clevo heads though. But because it's a block cast in a Ford plant, it's still legit, despite nothing else being factory?

It's a very grey area that I struggle to deal with myself.

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true that bear and gets back to the ford vs chev thing in original form from the factory in the late 60s and 70s,ford was king ,like put a 351c vs a 350 chev the ford 4v wins.

Although I'm pretty impressed, there ain't much Clevo left in that engine... 

his engine at the time was a fontana alloy clevo block from usa,but back in the day he said the normal clevo block starts splitting around 900hp lol.

And likely a factory block, seeing as aftermarket ones weren't around back then. Maybe a pillow... That was as good as it got though

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its not the first clevo to make 1000hp ahh ok maybe n/a ,ben gatt 351c has been making 1800hp for years but that is blown.

i got paid today for the 400 ,its going in a f7000 truck i guess that a big f truck ,what a nice home to go into ,still looking for the next car.

a zk fairlane would be ok cause it has the firewall in the normal v8 position,the xf pushes in a bit more that makes the heater non usable ,and for a family car i think i would need it working,and for a roady as well,seems zl is quite easy to find and still an ok car,but i need a earlyer model where a c4 t bar fits spot on and prefer xe sedan or zk i will consider most models,even a xe wagon would be a good machine jacked up high at the rear and big duel exhaust ect,,,and of corse raised white lettering on the tyres.

Might have to settle for a wagon or Fairlane as these are going a lot cheaper (in comparison).

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The 400 reco engine sold last night,$4000,picking up saturday,that facebook marketplace is 1000 times better than e bay,in just 2 days i had 2000 looks instead of 50 looks for 7 days on e bay,now have some cash to look at some wheels for my own 400 engine,but slim pickings out there ,i hope i can snag something that is not advertised,prefer xe sedan roller .