Thread: Question about formula 4 dynamic comp.

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Here are some kits from Jegs....
http://www.jegs.com/webapp/wcs/store...10002_10449_-1

And some pro and con discussions on another forum....
http://forums.corvetteforum.com/show....php?t=1450082

It all depends on whether or not you have to pass emissions in your area and how environmentally responsible you feel. The simplest way is to install a filtered breather on each valve cover. Some guys have experimented with using belt-driven or electrically-driven smog pumps to evacuate the crankcase with varying degrees of success. I've read more bad than I have good. Seems the problem is that most pumps will pull too much vacuum, pulling oil away from the main seals and wrist pins. About 15-16 inches seems to be the limit before you create another can of worms. Also, the OEM type belt-driven pumps tend to sieze up and throw the belt.

In the end, anything you can do to prevent foul crankcase vapors from polluting the fresh intake charge will be to your benefit, particularly when approaching the upper end of dynamic compression ratios.