How to destroy an Evo rebuild!

I found some information on "Singh grooves"

Twinscrew,

I have been involved with this modification for a few years. Most of my work is with Generation 1, 2 & 3 SBC engines although I have done an occasional Ford and Mopar. I have done high compression race engines, street performance engines even the engine in my tow truck, all experiences have been very positive.

I’m a cylinder head porter, not professional; what started as a hobby for me more than 25 years ago has grown into a sideline job; I cover my racing expenses by modifying cylinder heads.

This modification changes the combustion characteristics of the engine, the burn is more complete. This is very evident in the modified engines.

Here’s an example, I can take good running 13:1 compression 23 degree SBC running a camshaft with 280 degrees duration at 0.050”. Idle quality is acceptable with current carburetor technology and CD ignition but requires high idle speed. Unburned fuel can be found in the oil. Groove the cylinder heads and the engine dries up, the burn is more complete, the oil runs clean after dozens of high RPM runs. Idle quality is unmatched; I have never before seen a race engine idle at 500 RPM.

Another benefit of the modification is the engine becomes more resistant to detonation. I have proven this with N/A engines and have read of others that have done so with turbo charged engines. This is possibly the most important benefit.
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http://speedtalk.com/forum/viewtopic.php?t=4069
 
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this is REALLY bad.

not one flexi joint on the pipes.

bad welds getting sucked into turbo and killing it. They replace the turbo, but DONT clean out engine etc...seriously people in spain should NEVER goto this garage lol.
 
This got a proper LOL from me :D

Fuel system diagram:
bombagasolinaft0so1.jpg
 
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