I haven't had a chance to look at this on anything other than my phone, but how are the cams driven with this package?

Based on what I can see, it looks like a nice system!



EDIT: Never mind, these look like they are 4V heads, but not DOHC heads like we were talking about...

I looked into this company years ago and it looked like they had a very bad track record of delivering a product on time, quoted cost or even at all. Many unhappy customers from what I came up with

The Arao heads are not DOHC heads. They are just 32 valve heads. I have also wanted to use them but just haven't found the right application. Their flow numbers are pretty damn impressive. They also don't come cheap.
TruePower made some DOHC heads. I originally thought they were for a BBC but after looking further, they used an Eagle aluminum block with 5.0 bore spacing. According to the dyno pulls, they made over 1400 hp on pump gas with their DOHC heads and a PSI.
Eddie

Saw these at the LA Roadster Show the other week. Pretty clean looking but they were on a car.

http://www.valleyhead.com/thunder.html

When I spoke with Merc on the 1300s, the new block was supposedly created to keep the oil pressure up on the new heads, hence they had to develop a new block with new oil galleys for the heads. They quoted me "if we could've just used the heads, not re adapt the oiling system we'd have saved allot of money not developing a new block"...

Now personally this sounds pretty stupid to me. Agreed, the integrated package is fantastic. However, for the DOHC heads, you could adapt them, and just simplistically thinking, if you were an efi package, and went ahead and ran a multi-stage dry sump pump, you could run each set of heads on a stage...I don't see any reason why this wouldn't work just fine...

I was thinking about this the other day, the merc is a package, it has nothing to do with the turbos, they wanted to debut the turbo charged vs supercharged, but there is NO reason you couldn't bolt a PSI or a large Whipple up to this and make some serious power.

I personally would rather have a charger. On a side note and header design, they're using the log manifolds, the reason, easy, they don't want anything cracking, the heads and the combo already makes gobs of power so what are you really losing. This header debacle is ridiculous....for the 30-50hp you lose from not running big headers, you just add 1lb of boost...

Anyway, just my .02...cents

Turbos and superchargers, DOHC are all Nice additions
http://www.turbosquid.com/3d-models/...w-model/563352

It's not it hasn't been done in racing apps, it hasn't been done with BIG BLOCKS....

You can get anything you want with a 350...383....**** a stroked out 427...minute you hit the 500cu mark...things change...

We need Torque, you aren't pushing a 38, 42, 47, 50 anything with small blocks at the speeds we run...

I know Bob Russel had a crazy set of PSI / DOHC motors in his 47GTX as I recall correctly, this was many moons ago before the technology was around to tune them reliably...I dont think they ever ran well, but I know of a large builder in Michigan *hint hint* I think is working on something...last I heard through the grape vine..

The True Power, which was originally the Eagle Engine by Joe Schubeck certainly has the right idea, but there were a lot of issues with this package. But they had the right idea.

:whistle:Thanks for the input on my question "PROS"...........sarcasim!

These may be the old Rolling Thunder heads developed years ago for the BBC. The orignal proposed application was an airplane motor, and they were turbocharged, ran about 4000 rpm and produced 700 hp. The plan was to replace a turboprop at about 1/4 the cost.

The issue they have is the durability of all those parts and the deflection in the multiple pushrods.

Wannabe