Cutaway of the Honda CVCC engine.

[CENTER][/CENTER]

It managed to comply with contemporary emissions regulation without EFI or catalityc converter. That's some combustion efficiency.

One of these days I'm going to try this......

When you’re ready shoot me a line at automotivebreath@hotmail.com: I'll help
you get started.

Last night I was getting ready for first round of the Friday night races and I
got a call from Mark, a long time racer/hot rodder. He had installed his 355
with these Edelbrock RPMs in his project 63 Nova. He is very familiar with the
engine it came out of his previous street rod. He fired it up for the first time
after installing the modified heads. He couldn't believe the difference. With
a 280 degree Isky hydraulic cam the engine now idles cold at 500 RPM with
no choke. Throttle response is crisp and instant.

That by itself would be pretty cool. Something, is definatly going on inside there.........Will do.....

What determines where to place the grooves?

I conclude flame speed is much faster. Conditions in the cylinder and
in the exhaust port near the valve at the end of the exaust stroke
are much different, this has a positive impact on the intact tract
during overlap.

For the most part the valves limit where grooves can be laid out. Most
multi groove heads that you see from me are either my thinking or ideas
I get from others.

What do you use to machine these grooves? Can you do it by hand with a die grinder or something? Or can I assume you use a milling machine?

Hi Lil Big Mec,
Somender Singh uses a hand held hacksaw blade and a file. I tried that once
and it was too slow for me. I know other people that use a high speed cutoff
wheel. I tried that too but was too nervous that I might mess up.

So I developed my own method, I don't have a mill so I fabricated a jig that
allows me to cut a straight line with my high speed grinder. I use a 1/16" ball
end mill to cut the initial groove, I then widen and deepen the groove into the
chamber with a file.

The most important part is to layout the bore size on the head to assure the
gasket seal area is not damaged. I mark the bore diameter and lay out the
grooves with a felt tip marker as shown.